Method for the production of human T-T cell hybrids and production suppressor factor by human T-T cell hybrids
This invention was made in part with government support under CA 32070 awarded by the National Cancer Institute. The government has certain rights in this invention. 
    
    
     This application is a continuation-in-part of previously filed U.S. application Ser. No. 609,273, filed May 11, 1984, now abandoned. 
    
    
     This invention relates to a method of making human hematopoietic hybrid cells such as human hematopoietic hybrid cells and especially T-T cell hybrids. Some of these T-T cell hybrids produce suppressor factor (SF) which suppresses cellular proliferation and antibody production and would be useful to control disorders such as those involving abnormal cellular proliferation. Some of the human T-T cell hybrids produce B-cell growth factor (BCGF). 
     SUMMARY 
     A method has been developed for the production of human hematopoietic cell hybrids especially T-T cell hybrids as determined by HLA typing. 
     Some of these T-T cell hybrids produce factors useful for biotherapy or exhibiting specific-immunological functions. This is accomplished by fusing cells from human T cell lines with appropriately sensitized or induced human T cells exhibiting specific immunological function or producing the desired factors. According to the procedure of the invention, selection in HAT medium, that may be toxic to certain hybridomas is not required. (HAT=hypoxanthine-aminopterin-thymidine). 
     The method is shown to fuse lymphocytes of T cell line cells but it makes possible the production of B cell hybridomas which may then produce human or other monoclonal antibodies. 
    
    
     DESCRIPTION 
     The following references have dealt with T-T cell hybrids: 
     Irigoyen, O. et al. (1981) J. Exp. Med. 154:1827. 
     Okada, M. et al. (1981) Proc. Natl. Acad. Sci. U.S.A. 78:7717. 
     Butler, J. L., et al. (1983) J. Exp. Med. 157:60. 
     Kobayashi et al., (1982) J. Immunol. 128:2714. 
     Asada et al., (1983) Cellular Immunology, 77:150. 
     Le, J. et al, (1982) Proc. Natl. Acad. Sci. U.S.A. 79:7857. 
     Foung et al., (1982) Proc. Natl. Acad. Sci. U.S.A. 79:7484. 
     DeFreitas, E. C., et al, (1982) Proc. Natl. Acad. Sci. U.S.A. 79:6646. 
     Trucco, M., (1984) Nature 309:166. 
     Also there is some previous description of T-T cell hybrids which produce SF: 
     Grillot - Courvalin, Catherine et al. (1981) Nature 292:844. 
     Greene, Warner, C., et al. (1982) J. Immunol. 129:1986. 
     Taussig, M. J., et al. (1979) Nature 277: at 305 and 308. 
     Kontianen, Sirkka et al. (1978) Nature 274:477. 
     The method of the invention differs from all of the above in that: 
     1. HAT medium is not used 
     2. HGPRT negative or any other drug sensitive mutants of the lymphoplastoid T cell line are not needed. 
     3. Selection of the hybrids has been accomplished by cloning in agar and limiting dilution methods and has been done on the basis of their functional properties and the expression of HLA antigens. Factor(s) have been identified which suppress not only mitogen or antigen (alloantigen) driven cellular proliferation of human peripheral blood leukocytes but also antibody production (U.S. Pat. application Ser. No. 609,273 filed May 11, 1984, now abandoned). 
     Such factor(s) have potential use for example in the treatment of patients with cancer, graft versus host disease(s), autoimmune disease(s) and lympho-proliferative malignancy disorder(s) such as leukemia. 
     Previous suppressor factors have been reported in the literature [See Grillot-Courvalin, Catherine et al., (1981) Nature 292:844; Greene, Warner C., et al. (1982) J. Immunol. 129:1986; M. J. Taussig, et al. (1979) Nature 277: at 305 and 308; Sirkka Kontianen, et al. (1978) Nature 274:477; Eisenthal, A., et al. (1979) Ann N.Y. Acad. Sci. 332:367; Smith, R. T., et al. (1970) Am. J. Pathol. 60:495; Namba, Y., et al. (1975) Inflammation 1:5; Lee, S.C., et al. (1977) J. Immunol. 118:88; Jeogosothy, B. V., et al. (1979) J. Exp. Med. 150:622; Namba, Y., et al. (1977) J. Immunol. 118:1379; Jegosathy, B. V., et al. (1976) 193:1260; and Waksman, B. H., et al. (1978) Cell Immunol. 36:180]. 
     The suppressor factor(s) described are different from all these factors above because they: (1) exhibit different functional properties, (2) exhibit different molecular weight; (3) are produced constitutively and in substantially higher quantities. 
     Stable human hybridomas such as T-T cell hybrids were developed by fusing cells from human lymphoblastoid cell lines such as T cell lines (e.g., Jurkat or Molt-4) with human lymphocytes such as peripheral blood T cells stimulated with mitogens such phytohaemagluttinin (PHA), Concanavalin A (Con A), Staphylococcus Enterotoxin A (SEA) or with allogeneic cells in mixed lymphocyte MLC). 
     The hybrids were selected by cloning in agar and by limiting dilution methods described below. 
     Stimulation of peripheral blood lymphocytes with mitogens or allogeneic cells in MLC 
     Human peripheral blood mononuclear leukocytes (MNC) from normal donors were adjusted at a concentration 2×10 6  cells/ml and were cultured with optimal concentrations of Con A or PHA or SEA (PHA 5-10 micrograms/ml, Con A 2-25 micrograms/ml and 0.01-0.1 micrograms/ml of SEA). 
     The cells were cultured for 2-4 days, then washed three times with RPMI 1640 supplemented with 10% heat inactivated fetal calf serum (FCS) and fused with lymphoblastoid T cell lines as described. 
     Alternatively, E-Rosette forming cells were isolated from mitogen-stimulated MLC by rosetting with sheep erythocytes by the method described below. 
     In other experiments human peripheral blood mononuclear leukocytes at a concentration of approximately 2×10 6  cells/ml were stimulated with allogeneic mononuclear cells as for example 2×10 6  cells/ml irradiated at 2500 rads. Cells were washed 3× with RPMI 1640 supplemented with 10% heat inactivated FCS and fused with lymphoblastoid T cell lines as described. 
     Human lymphoblastoid T cell line 
     Cells of the Jurkat T cell line were grown in RPMI 1640 medium supplemented with 10% heat-inactivated fetal calf serum, 25 mM Hepes buffer, 2 mM L-glutamine, 100 U/ml penicillin and 100 micrograms/ml of streptomycin. 
     Fusion for Hybrid Cell Production 
     Human peripheral blood mononuclear leukocytes or purified T cells stimulated with mitogens or allogeneic cells in MLC were washed 3× with serum-free RPMI 1640. Cells from the Jurkat lymphoblastoid T cell line or other cell lines employed were so washed. 
     Mitogen or alloantigen activated mononuclear cells or T-lymphocytes were mixed in a single tube with cells from a T cell line such as a lymphoblastoid T cell line as Jurkat at appropriate ratios such as 10/1. The cells were centrifuged for 10 min at 400×g. The supernatant was removed and discarded and the mixed cell pellet was disrupted and dispersed by gentle agitation. 
     1 ml of pre-warmed (37° C.) fusion medium (50% polyethylene glycol in RPMI 1640) was added dropwise to the cell pellet and the mixture was agitated by rocking the tube gently by hand for one minute (moving the tube through an arc of a circle of about 90° is found to work well). 1 ml of pre-warmed (37° C.) serum-free RPMI 1640 was added slowly and the tube was rolled gently between the hands for about one minute. 
     Two ml of pre-warmed serum-free RPMI 1640 was added and the tube was rolled gently between the hands for about two minutes. 
     Four ml of prewarmed RPMI 1640 supplemented with 10% heat-inactivated FCS were added and the tube was rolled between the hands for about three minutes. 
     Eight ml of prewarmed RPMI 1640 supplemented with 10% heat-inactivated FCS and the tube was gently rolled between the hands for another three minutes. 
     The cells were centrifuged for ten minutes at 400 g, and re-suspended very gently in RPMI 1640 supplemented with 15-20% heat-inactivated fetal calf-serum, 25 mM Hepes, 2 mM L-glutamine, 100 U/ml penicillin, 100 micrograms/ml streptomycin. 
     The cells were incubated at 37° C. in a humidified incubator with 5% CO 2 . 
     Hybridoma selection procedure 
     After incubation for appropriate time intervals (1-60 days) at 37° C. the cells were twice washed with RPMI 1640 supplemented with 10% heat-inactivated fetal calf serum (FCS), and appropriate number of cells in this medium were mixed with appropriate volumes of semi-solid medium such as 1% agar in RPMI 1640 supplemented with 15% heat-inactivation FCS, 2 mM L-glutamine, 25 mM Hepes 100 U/ml penicillin, 100 micrograms/ml streptomycin to achieve a final concentration of about 0.3% agar. The cells and the agar were mixed immediately and the cells were transferred quickly to appropriate-sized petri dishes such as 100 mmm. Other semi-solid media may be used as well as agar. (It had been standard procedure in the art of hybridoma selection to incubate cells for two days and then transfer them to HAT medium. In this invention such a medium or any other toxic medium is not used). In this invention the best times for transfer to semi-solid medium after incubation were found to be 10, 15 and 20 days. Other sufficient incubation times might be 5 days or 3 days etc. for example. 
     The agar was allowed to solidify at room temperature and the petri dishes were transferred to a humidified 37° C. incubator with 5% CO 2 . Growth of colonies was revealed by macro- or microscopic inspection at 7-40 days. 
     Individual colonies were transferred to 96-well flat-bottomed well plates and 100 microliters of RPMI 1640 supplemented with 20% heat-inactivated FCS, 25 mM Hepes, 2 mM L-glutamine, 100 U/ml penicillin, 100 microgram/ml streptomycin was added per well. 
     In certain experiments these wells contained feeder cultures consisting of irradiated (with 2500 rads) human peripheral blood mononuclear leukocytes, whose lymphocytes were used as a fusion partner or possibly from other donors. 
     Supernatants or hybrids from wells exhibiting cell growth were expanded and screened for functional prpperties using the methods described below. 
     Hybrids with functional properties were HLA typed and cytogenetically analyzed. Alternatively, one could screen first by HLA or T cell differentiation antigen expression and then determine functional properties of hybrids so selected. Cells producing factors useful for biotherapy or exhibiting specific biological functions of interest were further re-cloned several times by limiting dilution methods at the level of 0.2-0.4 cells/well in RPMI 1640 containing 15-20% heat-inactivated FCS, 25 mM Hepes, 2 mM L-glutamine, 100 U/ml penicillin, 100 micrograms/ml streptomycin. 
     Feeder layers were employed comprising approximately 25,000-100,000 irradiated human peripheral blood mononuclear leukocytes preferably from the same donor used as a fusion partner or from a different donor. 
     The cell surface phenotype of these hybrids is T3 +   T4 +  T8 - . However, using these methods hybrids of other phenotypes can be developed. The examples above serve to illustrate the invention and not to limit the invention to the examples shown. 
     ISOLATION OF PERIPHERAL BLOOD MONONUCLEAR LEUKOCYTES 
     Depletion of Monocytes 
     Mononuclear cells from normal donors were isolated by centrifugation on a Ficoll/Hypaque density cushion (Boyum, A. (1968) Scand. J. Clin. lab. Invest. 21:(Suppl. 97) 77), at room temperature. The cells were washed three times in Hanks&#39; balanced salt solution (HBSS) and resuspended in RPMI-1640 containing 15% heat-inactivated fetal calf serum at a concentration of 4×10 6  cells/ml. Lymphocyte separator reagent (Technicon Instrument Co., Tarrytown, N.Y.) was added to the mononuclear cell suspension at a volume ratio of 1:2 and the mixture was incubated at 37° C. on a rotator for 30 min. Phagocytic cells were depleted by subsequent centrifugation at 400×g for 20 min on a Ficoll/Hypaque density cushion. Lymphoid cells depleted of phagocytic cells were collected from the interface, washed three time with Hank&#39;s balanced salt solution (HBSS) and resuspended at 4×10 6  cells/ml. 
     Preparation of T lymphocytes 
     T lymphocytes were prepared by rosetting with neuraminidase-treated sheep erythrocytes (SRBC) (25 units/ml. of 5% SRBC) followed by centrifugation on ficoll/Hypaque as previously described [Platsoucas et al. (1980) J. Immunol. 125:1216]. Two-milliliter aliquots of lymphocytes (4×10 6  /ml) in HBSS were mixed with 0.5 ml of heat-inactivated and SRBC-absorbed fetal calf serum and 2 ml of 1% neuraminidase treated SRBC. The mixture was incubated for 5 min at 37° C., centrifuged for 5 min at 200×G, and incubated at 4° C. for an additional hour. The rosettes were resuspended carefully and incubated on ice for an additional 15 min. The cell suspensions were layered on a Ficoll/Hypaque density cushion and centrifuged at 400×G for 20 min at controlled temperature (22° C.). Non-T cells were recovered from the interface and were washed three times with HBSS. Rosetting T cells were recovered from the pellets after lysis of attached SRBC by Tris-buffered 0.83% ammonium chloride (pH 7.2). The T cells were washed three times with HBSS. E-rosetting cells prepared by this method were more than 95% T lymphocytes, as determined by rerosetting with SRBC without nonspecific esterase-positive cells and less than 2% immunoglobulin-bearing cells. E-rosette-negative cells contained more than 70% surface immunoglobulin cells, as determined by immunofluorescence, and less than 1% of E-rosette forming cells or non-specific esterase positive cells. These cells were used as B cells. B cells are used for B cell growth factor assay. 
     Proliferative Response to Mitogens 
     Human peripheral blood mononuclear leukocytes (at a concentration of 1×10 6  cells/ml) were cultured in RPMI-1640 containing 10% fetal calf serum and supplemented with 25 mM Hepes, 2 mM L-glutamine and 100 units/ml Penicillin and 100 micrograms/ml streptomycin. One hundred microliters of the cell suspension were stimulated on U-microliter plates (Scientific Products) by various concentration of mitogens (PHA-P, Con A, PWM) at 37° C. in a humidified incubator in a 5% CO 2 , 95% air environment. The cultures were pulsed with 25 microliters of tritiated thymidine (specific activity, 6.7 Ci/mmol, New England Nuclear, Boston, Mass.) after 72 hours and harvested using an automatic cell harvester 24 hours after the addition of the isotopes. 
     Mixed Lymphocyte Culture 
     Human peripheral blood mononuclear leukocytes from various donors were prepared as above. 
     Responding cells (1×10 5 ) were cultured with 1×10 5  stimulating cells in round bottom microtiter plates in total volume of 0.2 ml. The stimulating cells were inactivated by x-irradiation (2000 rads). The culture medium is RPMI-1640 supplemented with 10% heat-inactivated fetal calf-serum, 25 mM Hepes, 2 mM L-glutamine, penicillin (100 units/ml) and streptomycin (100 microgram/ml). The cultures were incubated at 37° C. in a humidified atmosphere with 5% CO 2 , pulsed the 5th day with 1 micro Ci/well of  3  H-thymidine (New England Nuclear, Boston, Mass., specific activity 6.7 Ci/mmole) and harvested 24 hours later on an automatic cell harvester (Skarton, Norway). All cultures were performed in quadruplicate. 
     Natural Killer Cytotoxicity 
     Natural killer cytotoxicity was determined as previously described (Platsoucas, et al. (1980) J. Immunol. 125:1216). Target cells of the K562 and Molt-4 lines, maintained in RPMI-1640 supplemented with 10% fetal calf serum, glutamine and antibiotics as above were labelled with 300 microliters of  51  Cr per 2×10 6  cells [sodium ( 51  Cr) chromate, New England Nuclear, Boston, Mass.] for 2 hours. The target cells were washed three times and then resuspended in the same medium, at a concentration of 5×10 4  cells/ml. Effector lymphocytes were washed three times in RPMI-1640 supplemented with 10% fetal calf serum, arranged at the appropriate concentration and one hundred microliters were added to one hundred microliters of target cells in U-bottom microtiter plates (Nunclon, Denmark), to achieve effector to target ratios 100:1, 50:1, and 25:1 etc. The plates were centrifuged at 40×g for 2 min and subsequently incubated at 37° C. in a humidified 5% CO 2  atmosphere. After 4 hours, the plates were centrifuged at 500×g for 5 min and 100 microliters of the supernatants were collected and counted for  51  Cr release in a well-type Auto-Gamma scintillation counter. 
     Percent specific lysis is calculated by the formula: ##EQU1## where E=mean cpm released in the presence of effector cells. S=mean cpm spontaneously released by target cells incubated with medium alone, and T=mean cpm released after treating target cells with Triton×100 (1:100 dilution). 
     Cell Viability 
     Peripheral blood mononuclear leukocytes (MNL) were cultured at a concentration of 1×10 6  cells/ml in RPMI 1640 supplemented with 10% heat-inactivated FCS, 25 mM herpes buffer, 2 mM L-glutamine, and the antibiotics streptomycin 100 micrograms/ml and penicillin 100 U/ml for up to 88 hrs. 
     Control samples were incubated in the above medium and test samples are incubated with SF produced by Jurkat et al cell lines. Samples were withdrawn at 20 hrs, 44 hr, 68 hrs and 88 hrs. Cells twice were washed and viability was determined by Trypan blue dye exclusion. 
     M.W. determinations 
     These were carried out by AcA-44 ultrogel (LKB) filtration in isotonic prosphate buffered saline (PBS). Molecular weight markers employed involved: 
     Bovine serum albumin: 68,000 M.W. 
     Ovalbumin: 43,000 M.W. 
     Cytochrome c: 11,700 M.W. 
     Induction of de novo Ig synthesis and secretion by human peripheral blood mononuclear leukocytes in the PWM - induced differentiation system 
     Human peripheral blood mononuclear leukocytes were cultured at 1×10 6  cells/ml in RPMI-1640 supplemented with 10% heat inactivated fetal calf serum, 2 mM glutamine, Hepes and antibiotics as previously described, in total volume of 2 ml, for 7 days at 37° C. in 5% CO 2  in a humidified incubator. Pokeweed mitogen (10 microgram/ml, optimal concentration; Grand Island Biological Co., Grand Island, N.Y.) was added from the beginning of the culture. After incubation for 7 days the tubes were centrifuged at 400×g and supernatants were carefully withdrawn and stored at -20° C. until assayed for immunoglobulin. 
     Determination of De Novo IgG, IgA, IgM Immunoglobulins by Enzyme-linked Immunoabsorbent Assay (ELISA) 
     These determinations were carried out by a modification of the method described by Engvall and Perlmann J. Immunol. 109:129 (1972). Rabbit anti-human immunoglobulin antibody, heavy chain specific (mu, gamma or alpha) (Accurate Chemical) were arranged at a concentration of 5 g/ml in 0.10 M Na , pH 9.6, containing 0.05% sodium azide. Two hundred microliters of antibody solution per well were transferred into 96-well round bottom microliter plates and incubated at 37° C. for 3 hours. The plates were stored at 4° C. until use and were stable for over two weeks. Before use the plates and were washed with PBS containing 0.02% Tween 20 three times, were allowed to remain at room temperature for 5 min, between washings. Several dilutions of the unknown immunoglobulin containing supernatants were prepared in PBS containing 0.02% Tween 20 and volumes of 0.2 ml will be transferred to the plates. The plates were incubated for 5 hours at room temperature, on a rocket platform. 
     Supernatants were removed by aspiration and the tubes were washed three times with PBS, containing 0.02% Tween 20. Alkaline phosphatase conjugated rabbit anti-human immunoglobulin antibody heavy chain specific was obtained from AMF Immunoreagents Inc., Sequin, Tex. (gamma  mu , or alpha heavy chain specific). Before use the conjugates were absorbed with 1% ovalbumin solution in phosphate buffered saline (1 hour at room temperature), to absorb extra glutaraldehyde. One ml of conjugate diluted 1:500 with PBS- Tween 20, was added to the anti-human Ig-human Ig coated tubes, and the tubes were incubated for 16 hours at room temperature. Subsequently, the unbound conjugate was removed by washing the plates three times with PBS- Tween 20. The amount of bound alkaline phosphatase rabbit anti-human heavy chain specific, was determined using p-nitrophenylphosphate (NPP) (Sigma) as a substrate. One ml of 1 mg/1 NPP, in 0.05 M sodium carbonate buffer (pH 9.8) containing 10 -3  M MgCl was added to the plates and the released p-nitrophenolate was measured at 405 nm after one hour, using a titertek ELISA reader. Standard curves were constructed using purified IgG, IgA or IgM immunoglobulins for polyclonal immunoglobulin secretion, or purified paraproteins from patients with multiple myeloma for the determination of idiotypic immunoglobulin secretion. 
     PBS=phosphate buffered saline 
     Interferon Determination 
     Alpha and gamma interferons were determined by the standard cytopathic effect reduction assay using vesicular stomatitis virus challanged human fibroblasts trisomic for chromosome 21, or bovine kidney cells (MDBK cells). 
     Titers of interferons were determined by the reciprocal of the highest dilution which inhibited the cytopathic effect by 50%. In other experiments, monoclonal or polyclonal antibodies specific for alpha or gamma interferons were added to the mononuclear cells immediately before the addition of PHA and the SF(s). These monoclonal antibodies did not block the inhibition by the SF(s) of the proliferative responses of MIC to PHA. 
     Lymphotoxin or TNF was determined by the in vitro method of Carswell, E. et al. (1975) Proc. Nat&#39;l. Acad. Sci. USA 72:3666. 
     BCGF Assay 
     The method of Muraguchi, A. and A. S. Fauci (1982) J. Immunol. 129:1104 was used. 
     Factor(s) were described and identified which inhibit leukocyte proliferative responses. In particular these factor(s), suppressor factor (SF), have been found to be produced by hematopoietic cells such as human lymphoblastoid cell lines--especially T cell lines and others such as B cell lines or erythroleukemic cell lines. Particular T cell lines known to produce supressor factor(s) are Jurkat, HPB-ALL, TALL-1, HD-MAR, SKW-3, DND 41, HPB-MLT and MOLT-4. Erytholeukemic cell lines such as K-562 can also produce SF. B cell lines such as CESS can also produce SF. This data is seen in U.S. Pat. application Ser. No. 609,273 filed May 11, 1984 now abandoned. 
     Supernatants from such cells inhibit the proliferative responses of T-lymphocytes to mitogens such as phytohemagglutinin (PHA), concanavalin A (CON A) and poke-weed mitogen (PWM). (Tables I-III) 
     It also inhibits the proliferative responses of T-cells to allogeneic cells in mixed lymphocyte culture (MLC). (Table IV) 
     Also this factor(s) inhibits antibody production of blood cells, and especially in vitro by human peripheral blood mononuclear leukocytes in the PWM-driven system (Table V). SF may inhibit certain proliferative responses of B-cells. 
     The action of SF appears to be cytostatic not cytotoxic since it: 
     (1) does not affect the viability of human peripheral blood mononuclear leukocytes in culture after a four day incubation (Table VI); 
     
                                           TABLE IA                                
__________________________________________________________________________
Inhibition of proliferative response of peripheral                        
blood mononuclear leukocytes to PHA, by SF produced                       
by the Jurkat, HPB-All and Molt 4 lines                                   
          PROLIFERATIVE RESPONSES (CPM)                                   
          Jurkat       HPB-All      Molt-4                                
                 % suppres-   % suppres-   % suppres-                     
% SF (v/v)                                                                
          CPM    sion  CPM    sion  CPM    sion                           
__________________________________________________________________________
medium     513 ± 175                                                   
                 --     513 ± 175                                      
                              --     513 ± 175                         
                                           --                             
medium + PHA                                                              
          11058 ± 1883                                                 
                 --    11058 ± 1883                                    
                              --    11058 ± 1883                       
                                           --                             
medium + PHA +                                                            
          2351 ± 223                                                   
                 79%    6318 ± 1689                                    
                              43%   2399 ± 339                         
                                           78%                            
0.015% SF                                                                 
medium + PHA +                                                            
          2612 ± 337                                                   
                 76%    2199 ± 1792                                    
                              35%   1118 ± 28                          
                                           89%                            
0.05% SF                                                                  
medium + PHA +                                                            
          2861 ± 269                                                   
                 74%    8800 ± 2172                                    
                              20%    998 ± 105                         
                                           91%                            
0.1% SF                                                                   
medium + PHA +                                                            
          4404 ± 390                                                   
                 60%   1778 ± 111                                      
                              84%   1333 ± 328                         
                                           88%                            
0.5% SF                                                                   
medium + PHA +                                                            
          3921 ± 277                                                   
                 65%   1419 ± 234                                      
                              87%   1127 ± 77                          
                                           89%                            
0.95% SF                                                                  
medium + PHA +                                                            
          4156 ± 256                                                   
                 62%   1564 ± 156                                      
                              86%   1130 ± 138                         
                                           89%                            
1.9% SF                                                                   
medium + PHA +                                                            
          4426 ± 354                                                   
                 60%   2186 ± 265                                      
                              80%   1240 ± 82                          
                                           89%                            
3.75% SF                                                                  
medium + PHA +                                                            
          3512 ± 302                                                   
                 68%   2335 ± 319                                      
                              79%   985 ± 36                           
                                           91%                            
15% SF                                                                    
medium + PHA +                                                            
          3538 ± 571                                                   
                 68%   2685 ± 236                                      
                              76%   728 ± 57                           
                                           93%                            
30% SF                                                                    
__________________________________________________________________________
 
    
     
                                           TABLE IB                                
__________________________________________________________________________
Inhibition of proliferative response of peripheral                        
blood mononuclear leukocytes to PHA, by SF produced                       
by the K562, HPB-All, Molt-4 and CESS tumor cell lines                    
          PROLIFERATIVE RESPONSE (CPM)                                    
          K562          Molt-4       Cess        HPB-LL                   
                  %             %            %            %               
                  suppres-      suppres-     suppres-     suppres-        
% SF (v/v)                                                                
          CPM     sion  CPM     sion CPM     sion CPM     sion            
__________________________________________________________________________
medium    2279 ± 14                                                    
                  --    2279 ± 14                                      
                                --   2279 ± 14                         
                                             --   2279 ± 14            
                                                          --              
medium + PHA                                                              
          56211 ± 3811                                                 
                  --    56211 ± 3811                                   
                                --   56211 ± 3811                      
                                             --   56211 ± 3811         
                                                          --              
medium + PHA +                                                            
          1624 ± 88                                                    
                  97%   1499 ± 248                                     
                                97%  48729 ± 4699                      
                                             13%  8124 ± 399           
                                                          86%             
1.87% SF                                                                  
medium + PHA +                                                            
          1515 ± 190                                                   
                  97%   1287 ±  130                                    
                                98%  51048 ± 6139                      
                                             9%   8109 ± 816           
                                                          86%             
3.75% SF                                                                  
medium + PHA +                                                            
          2091 ± 942                                                   
                  96%   1249 ± 132                                     
                                98%  53579 ± 3152                      
                                             5%   6687 ± 773           
                                                          88%             
7.5% SF                                                                   
medium + PHA +                                                            
          1536 ± 119                                                   
                  97%   1225 ± 143                                     
                                98%  59898 ± 5211                      
                                             6%   7916 ± 1116          
                                                          86%             
15% SF                                                                    
medium + PHA +                                                            
          2009 ± 254                                                   
                  96%   865 ± 101                                      
                                98%  31823 ± 1550                      
                                             43%  5434 ± 777           
                                                          90%             
30% SF                                                                    
__________________________________________________________________________
 
    
     
                       TABLE lC                                                    
______________________________________                                    
Inhibition of proliferative response of human peripheral                  
blood mononuclear leukocytes to PHA, by SF produced                       
by TALL-1, HD-Mar, SKW-3, DND-41 and HPB-MLT                              
        Cell line                                                         
        Supernatant**                                                     
                  CPM        % Suppression                                
______________________________________                                    
MNC*      None         4677 ± 1367                                     
MNC + PHA None        93646 ± 9369                                     
MNC + PHA TALL-1      18119 ± 3822                                     
                                 81                                       
MNC + PHA HD-Mar       9914 ± 1182                                     
                                 89                                       
MNC + PHA SKW-3       9268 ± 434                                       
                                 90                                       
MNC + PHA DND-41      28633 ± 3356                                     
                                 69                                       
MNC + PHA HPB-MLT     12136 ± 342                                      
                                 87                                       
______________________________________                                    
 *MNC: Human, eripheral blood mononuclear leukocytes.                     
 **Cell line supernatants were employed at concentration of 25% (v/v).    
 
    
     
                                           TABLE II                                
__________________________________________________________________________
Inhibition of proliferative response of peripheral                        
blood mononuclear leukocytes to CON A, by SF produced                     
by the Jurkat, HPB-All and Molt 4 lines                                   
           PROLIFERATIVE RESPONSES (CPM)                                  
           Jurkat       HPB-All       Molt-4                              
                  % suppres-    % suppres-   % suppres-                   
% SF (v/v) CPM    sion  CPM     sion  CPM    sion                         
__________________________________________________________________________
medium     265 ± 47                                                    
                  --    265 ± 47                                       
                                --    265 ± 47                         
                                             --                           
medium + CON A +                                                          
           40792 ± 7959                                                
                  --    40792 ± 7454                                   
                                --    40792 ± 7454                     
                                             --                           
medium + CON A +                                                          
           3916 ± 239                                                  
                  90%   61751 ± 13610                                  
                                --    14440 ± 6966                     
                                             65%                          
0.015% SF                                                                 
medium + CON A +                                                          
           3606 ± 379                                                  
                  91%   31713 ± 11104                                  
                                22%   4814 ± 580                       
                                             88%                          
0.05% SF                                                                  
medium + CON A +                                                          
           3889 ± 413                                                  
                  90%   12399 ± 2129                                   
                                69%   4126 ± 681                       
                                             90%                          
0.1% SF                                                                   
medium +  CON A +                                                         
           4489 ± 649                                                  
                  89%   6414 ± 1356                                    
                                84%   3233 ± 688                       
                                             92%                          
0.5% SF                                                                   
medium + CON A +                                                          
           3671 ± 294                                                  
                  91%   3886 ± 1055                                    
                                90%   2718 ± 910                       
                                             93%                          
0.95% SF                                                                  
medium + CON A +                                                          
           3615 ± 211                                                  
                  91%   3678 ± 765                                     
                                91%   2244 ± 446                       
                                             94%                          
1.9% SF                                                                   
medium + CON A +                                                          
           3649 ± 350                                                  
                  91%   3879 ± 734                                     
                                90%   26622 ± 401                      
                                             93%                          
3.75% SF                                                                  
medium + CON A +                                                          
           3605 ± 191                                                  
                  91%   3421 ± 404                                     
                                92%   1729 ± 108                       
                                             96%                          
15% SF                                                                    
medium + CON A +                                                          
           3862 ± 381                                                  
                  91%   3637 ± 296                                     
                                91%   855 ± 48                         
                                             98%                          
30% SF                                                                    
__________________________________________________________________________
 
    
     
                       TABLE III                                                   
______________________________________                                    
Inhibition of proliferative response of peripheral                        
blood mononuclear leukocytes to PWM by SF produced                        
by the Jurkat tumor cell line                                             
            PROLIFERATIVE RESPONSES                                       
            (CPM)                                                         
            Jurkat                                                        
                            % suppre-                                     
% SF (V/V)    CPM           ssion                                         
______________________________________                                    
Medium         703 ± 84  --                                            
Medium + PWM  13119 ± 1792                                             
                            --                                            
Medium + PWM +                                                            
              4631 ± 389 65%                                           
1.56% SF                                                                  
Medium + PWM +                                                            
              4560 ± 373 65%                                           
3.12% SF                                                                  
Medium + PWM +                                                            
              3624 ± 381 72%                                           
6.25% SF                                                                  
Medium + PWM +                                                            
              4474 ± 306 66%                                           
12.5% SF                                                                  
Medium + PWM +                                                            
              5095 ± 352 61%                                           
25% SF                                                                    
______________________________________                                    
 
    
     
                       TABLE IV                                                    
______________________________________                                    
Inhibition by SF produced by the Jurkat tumor                             
cell lines, of the proliferative responses of human                       
peripheral blood mononuclear leukocytes to allogeneic cells in            
mixed lymphocyte culture                                                  
                PROLIFERATIVE                                             
                RESPONSES (CPM)                                           
                Jurkat                                                    
                           % suppre-                                      
% SF (v/v)        CPM      ssion                                          
______________________________________                                    
Medium            7382     --                                             
Medium + 1.56% SF 3849     48%                                            
Medium + 3.12% SF 3229     56%                                            
Medium + 6.25% SF 3922     47%                                            
Medium + 12.50% SF                                                        
                  3678     50%                                            
Medium + 25.00% SF                                                        
                  6159     17%                                            
______________________________________                                    
 
    
     
                                           TABLE V                                 
__________________________________________________________________________
Inhibition of de novo immunoglobulin synthesis and secretion of human     
peripheral blood mononuclear leukocytes in the PWM-induced                
differentiation system, by SF produced by the                             
Jurkat, HPB-ALL, Molt-4, K562 and CESS CELL LINES.                        
        Cell line                                                         
        Supernatants                                                      
               Immunoglobulin*                                            
        Dilutions                                                         
               IgM (microg/dl)                                            
                        IgA (microg/dl)                                   
                                 IgG (microg/dl)                          
__________________________________________________________________________
Mononuclear                                                               
        None   243.0    70.5     54.3                                     
cells + PWM                                                               
        Jurkat                                                            
MNC + PWM                                                                 
        1:3    19.0     l.t. 2.0 l.t. 2.0                                 
MNC + PWM                                                                 
        1:50   20.5     l.t. 2.0 ND                                       
MNC + PWM                                                                 
        1:1000 15.0     3.75     ND                                       
MNC + PWM                                                                 
        1:10000                                                           
               19.0     4.5      ND                                       
        HPB-ALL                                                           
MNC + PWM                                                                 
        1:3    10.5     l.t. 2.0 l.t. 2.0                                 
MNC + PWM                                                                 
        1:50   35.0     5.7      l.t. 2.0                                 
MNC + PWM                                                                 
        1:1000 27.3     11.3     l.t. 2.0                                 
MNC + PWM                                                                 
        1:10000                                                           
               22.3     13.0     l.t. 2.0                                 
        Molt-4                                                            
MNC + PWM                                                                 
        1:3    23.5     l.t. 2.0 ND                                       
MNC + PWM                                                                 
        1:50   36.7     14.3     l.t. 2.0                                 
MNC + PWM                                                                 
        1:1000 35.7     16.0     l.t. 2.0                                 
        K562                                                              
MNC + PWM                                                                 
        1:3    9.9      l.t. 2.0 ND                                       
MNC +  PWM                                                                
        1:50   17.8     l.t. 2.0 l.t. 2.0                                 
MNC + PWM                                                                 
        1:1000 18.3     9.0      ND                                       
        CESS                                                              
MNC + PWM                                                                 
        1:3    12.2     l.t. 2.0 10.3                                     
MNC + PWM                                                                 
        1:50   18.0     l.t. 2.0 ND                                       
MNC + PWM                                                                 
        1:1000 18.3     11.2     ND                                       
__________________________________________________________________________
 *Determined by ELISA                                                     
 ND--not determined                                                       
 l.t.--less than                                                          
 
    
     
                       TABLE VI                                                    
______________________________________                                    
The viability of peripheral blood mononuclear                             
leukocytes is not affected by prolonged                                   
incubation with SF produced by the Jurkat*                                
tumor cell lines                                                          
          % Viability                                                     
          Duration of treatment                                           
Tumor cell lines                                                          
            20 hrs   44 hrs   68 hrs 88 hrs                               
______________________________________                                    
Medium * alone                                                            
            98%      100%     96%    93%                                  
Jurkat      99%       96%     95%    90%                                  
______________________________________                                    
 *This effect is also seen with HPBALL, K562 and Molt4 supernatants.      
 
    
     
                       TABLE VII                                                   
______________________________________                                    
Suppressor factor(s) preparations produced by the Jurkat                  
cell lines do not affect natural killer cytotoxicity: mediated by         
peripheral blood mononuclear leukocytes, against K562 targets             
          % Cytotoxicity                                                  
          Effector to target ratio                                        
          Donor 1      Donor 2                                            
SF Source   50:1   25:1        50:1 25:1                                  
______________________________________                                    
Medium      66     59          58   50                                    
Jurkat      68     56          51   40                                    
______________________________________                                    
 
    
     
                                           TABLE VIII                              
__________________________________________________________________________
Inhibition of the growth of human lung tumor cell lines by SF -           
containing supernatants form the Jurkat, HPB-ALL, K562 and Molt-4         
human tumor cell lines                                                    
       Cell Numbers                                                       
       Lines                                                              
       SK-LC-6        SK-LC-14                                            
       Hours of       Hours of                                            
Cell line                                                                 
       Treatment      Treatment                                           
Supernatants*                                                             
       0    60   90   0    60   90                                        
__________________________________________________________________________
None   0.5 × 10.sup.5                                               
            1.4 × 10.sup.5                                          
                 5.7 × 10.sup.5                                     
                      0.5 × 10.sup.5                                
                           1.7 × 10.sup.5                           
                                4.2 × 10.sup.5                      
Jurkat 0.5 × 10.sup.5                                               
            0.6 × 10.sup.5                                          
                 1.5 × 10.sup.5                                     
                      0.5 × 10.sup.5                                
                           1.4 × 10.sup.5                           
                                1.9 × 10.sup.5                      
HPB-All                                                                   
       0.5 × 10.sup.5                                               
            1.1 × 10.sup.5                                          
                 1.4 × 10.sup.5                                     
                      0.5 × 10.sup.5                                
                           2.1 × 10.sup.5                           
                                3.0 × 10.sup.5                      
K562   0.5 × 10.sup.5                                               
            0.6 × 10.sup.5                                          
                 1.2 × 10.sup.5                                     
                      0.5 × 10.sup.5                                
                           0.7 × 10.sup.5                           
                                2.0 × 10.sup.5                      
Molt-4 0.5 × 10.sup.5                                               
            0.7 × 10.sup.5                                          
                 2.7 × 10.sup.5                                     
                           ND                                             
__________________________________________________________________________
 *These were used at a dilution of 30% (v/v).                             
 
    
     (2) Does not cause lysis of K562 leukemic cell targets which can be determined by such assays as the chromium release assay; and 
     This factor(s) does not affect natural killer (NK) cell cytotoxicity against K-562 targets. (Table VII) 
     Also this factor inhibits the growth in vitro of cells from certain human tumor cell lines (lung, colon, etc.) (Table VIII). 
     These SF(s) exhibit a relative molecular weight in the range of 55-70,000, as determined by AcA-44 gel filtration. 
     Table I-III shows the inhibitory effect of SF on the peripheral blood mononuclear leukocyte proliferative response to mitogens CON A, PWM and PHA. In these examples SF is produced by Jurkat, Molt-4, erythroleukemic cell lines such as K-562 and HPB-ALL cells as well as other cell lines. Cess B cell line generally is positive for SF. In addition, hematopoietic cell hybridomas produce SF. 
     Supernatants from TT cell hybridomas inhibit the proliferative responses of T-lymphocytes to mitogens such as PHA, CON A, and PWM (Table IX). 
     T-T cell hybridoma SF also inhibits the proliferative responses of T-cells to allogeneic cells in mixed lymphocyte culture (MLC). (Table X) 
     Also this factor(s) from T-T cell hybridomas inhibits antibody production of blood cells, and especially in vitro by human peripheral blood mononuclear leukocytes in the PWM-driven system (Table XI). SF may inhibit certain proliferative responses of B-cells. 
     The action of T-T cell hybridoma SF appears to be cytostatic not cytotoxic since it: 
     Does not affect the viability of human peripheral blood mononuclear leukocytes in culture after a four day incubation (Table XII). 
     This factor(s) does not affect natural killer (NK) cell cytotoxicity against K-562 targets. (Table XIII) 
     These factors are active not only on human but also on mouse cells. (Table XIV) 
     TT cell SF is not alpha or gamma interferon or lymphotoxin or tumor necrosis factor (TNF). 
     These SF(s) exhibit a relative molecular weight in the range of 55-70,000, as determined by AcA-44 gel filtration. 
     
                       TABLE IX                                                    
______________________________________                                    
INHIBITION OF PROLIFERATIVE RESPONSES                                     
TO PHA BY SUPERNATANTS FROM HUMAN T-T                                     
CELL HYBRIDOMAS                                                           
______________________________________                                    
       Hybridoma                                                          
       Supernatants                                                       
       (25%)       CPM           % Suppression                            
______________________________________                                    
MNC*               2,066 ± 341                                         
                                 --                                       
MNC +              194,234 ± 9,415                                     
                                 --                                       
PHA    +38F3       23,844 ± 2,795                                      
                                 88                                       
       +36(38F3)   29,262 ± 2,333                                      
                                 85                                       
       +179(36(38F3))                                                     
                   112,580 ± 10,183                                    
                                 42                                       
       +180(36(38F3))                                                     
                   119,602 ± 14,302                                    
                                 38                                       
       +182(36(38F3))                                                     
                   29,702 ± 9,005                                      
                                 84                                       
       +150(36(38F3))                                                     
                   26,141 ± 8,527                                      
                                 86                                       
       +151(36(38F3))                                                     
                   22,860 ± 5,210                                      
                                 88                                       
       +153(36(38F3))                                                     
                   14,440 ± 3,306                                      
                                 93                                       
       +154(36(38F3))                                                     
                    76 ± 20     99.9                                   
       +159(36(38F3))                                                     
                   10,089 ± 3,145                                      
                                 95                                       
       +160(36(38F3))                                                     
                   5,710 ± 871                                         
                                 97                                       
       +169(36(38F3))                                                     
                   10,662 ± 1,902                                      
                                 95                                       
       +170(36(38F3))                                                     
                   8,179 ± 192                                         
                                 96                                       
       +174(36(38F3))                                                     
                    58,036 ± 16,330                                    
                                 70                                       
       +175(36(38F3))                                                     
                   137,108 ± 34,721                                    
                                 29                                       
       +176(36(38F3))                                                     
                    98,643 ± 15,608                                    
                                 49                                       
       +177(36(38F3))                                                     
                   143,283 ± 25,986                                    
                                 26                                       
       +178(36(38F3))                                                     
                   130,097 ± 4,871                                     
                                 32                                       
______________________________________                                    
 *Human peripheral blood mononuclear leukocytes.                          
 
    
     
                Hybridoma                                                          
       Supernatants*                                                      
                   CPM           % Suppression                            
______________________________________                                    
MNC**              2,066 ± 341                                         
                                 --                                       
MNC +              194,234 ± 9,415                                     
                                 --                                       
PHA    +17F3       28,036 ± 1,508                                      
                                 86                                       
       +21F3       32,403 ± 7,066                                      
                                 83                                       
       +31F3       12,182 ± 2,751                                      
                                 94                                       
       +38F3       23,844 ± 2,795                                      
                                 88                                       
       +36(38F3)   29,262 ± 2,333                                      
                                 85                                       
       +88F3       117,353 ± 20,273                                    
                                 39                                       
       +92F3       132,662 ± 7,992                                     
                                 32                                       
       +181F3       92,166 ± 50,145                                    
                                 52                                       
       +182F3      117,715 ± 43,315                                    
                                 38                                       
______________________________________                                    
 *25% (v/v)                                                               
 **Human peripheral blood mononuclear leukocytes.                         
 
    
     
                       TABLE X                                                     
______________________________________                                    
INHIBITION OF PROLIFERATIVE RESPONSES OF HUMAN                            
PERIPHERAL BLOOD MONONUCLEAR LEUKOCYTES TO                                
ALLOGENEIC CELLS IN MIXED LYMPHOCYTE CULTURE                              
BY SUPERNATANTS FROM HUMAN T-T CELL                                       
HYBRIDOMAS                                                                
Hybridoma                                                                 
Supernatants                                                              
            CPM                                                           
(25%)       A × B C × D                                       
                                E × F                               
______________________________________                                    
None        6086        7382    5205                                      
21F3        86          196     ND                                        
32F3        156         ND      ND                                        
38F3        1252        91      51                                        
 77(38F3)   145         127     150                                       
181(38F3)   110         146     ND                                        
 36(38F3)   156         59      53                                        
153(36(38F3))                                                             
            82          146     59                                        
159(36(38F3))                                                             
            55          93      57                                        
160(36(38F3))                                                             
            73          141     80                                        
169(36(38F3))                                                             
            61          95      51                                        
170(36(38F3))                                                             
            57          111     81                                        
______________________________________                                    
 
    
     
                                           TABLE XI                                
__________________________________________________________________________
SUPPRESSION OF IMMUNOGLOBULIN SYNTHESIS AND SECRETION                     
IN THE PWM-INDUCED DIFFERENTIATION SYSTEM BY SUPERNATANTS                 
FROM T-T CELL HYBRIDOMAS                                                  
            Hybridoma                                                     
                    IgM    IgA    IgG                                     
            Supernatants                                                  
                    (ug/dl)                                               
                           (ug/dl)                                        
                                  (ug/dl)                                 
__________________________________________________________________________
Mononuclear + PWM                                                         
            None    189.8 ± 12                                         
                           101.7 ± 5.8                                 
                                  66.7 ± 9.7                           
leukocytes                                                                
            +21F3   17.4 ± 7.7                                         
                           &lt;3.0   &lt;3.0                                    
            +38F3   12.0 ± 4.1                                         
                           &lt;3.0   &lt;3.0                                    
            +181(38F3)                                                    
                    13.9 ± 4.7                                         
                           ND     &lt;3.0                                    
            +77(38F3)                                                     
                    27.6 ± 6.8                                         
                           39.5 ± 13.1                                 
                                  42.0 ± 5.2                           
            +36(38F3)                                                     
                    18.7 ± 1.5                                         
                           &lt;3.0   &lt;3.0                                    
            +153(36(38F3))                                                
                    16.5 ± 4.5                                         
                           3.7 ± 1.5                                   
                                  &lt;3.0                                    
            +159(36(38F3))                                                
                    15.7 ± 3.9                                         
                           &lt;3.0   &lt;3.0                                    
            +160(36(38F3))                                                
                    17.8 ± 2.9                                         
                           &lt;3.0   &lt;3.0                                    
            +168(36(38F3))                                                
                    13.2 ± 3.9                                         
                           &lt;3.0   &lt;3.0                                    
            +169(36(38F3))                                                
                    &lt;3.0   10.7 ± 5.1                                  
                                  &lt;3.0                                    
            +170(36(38F3))                                                
                    18.7 ± 1.5                                         
                           11.7 ± 2.5                                  
                                  &lt;3.0                                    
__________________________________________________________________________
 Human peripheral blood mononuclear leukocytes were incubated with PWM and
 hybridoma supernatants (30%) for seven days at 37C. Supernatants were    
 collected and levels of de novo synthesized IgM, IgA, and IgG were       
 determined by ELISA.                                                     
 
    
     
                       TABLE XII                                                   
______________________________________                                    
EFFECT OF SUPERNATANTS FROM HUMAN T-T CELL                                
HYBRIDOMAS ON THE VIABILITY OF HUMAN                                      
PERIPHERAL BLOOD MONONUCLEAR LEUKOCYTES                                   
            % Viability                                                   
Hybridoma   Incubation Time                                               
Supernatants                                                              
            20 hrs  44 hrs    68 hrs                                      
                                    88 hrs                                
______________________________________                                    
None        98      100       96    93                                    
21F3        98      97        97    95                                    
38F3        99      97        95    ND                                    
32(38F3)    97      98        98    95                                    
77(38F3)    100     96        92    89                                    
181(38F3)   98      98        97    91                                    
36(38F3)    98      98        93    91                                    
153(36(38F3))                                                             
            98      96        98    93                                    
159(36(38F3))                                                             
            98      98        95    ND                                    
160(36(38F3))                                                             
            99      100       95    94                                    
168(36(38F3))                                                             
            99      96        93    93                                    
169(36(38F3))                                                             
            100     97        99    95                                    
170(36(38F3))                                                             
            100     99        95    95                                    
______________________________________                                    
 Human peripheral blood mononuclear leukocytes were cultured with 30%     
 supernatants from TT cell hybridomas, washed twice and viability was     
 determined by trypan blue dye exclusion.                                 
 
    
     
                       TABLE XIII                                                  
______________________________________                                    
EFFECT OF SUPERNATANTS FROM T-T CELL                                      
HYBRIDOMAS ON NATURAL KILLER CYTOTOXICITY                                 
           % CYTOTOXICITY                                                 
Hybridoma    Donor 1       Donor 2                                        
Supernatants 50:1   25:1       50:1 25:1                                  
______________________________________                                    
Medium       66     59         58   50                                    
17F.sub.3 *  63     56         57   42                                    
36(38F.sub.3)*                                                            
             57     48         45   43                                    
77(38F.sub.3)*                                                            
             64     50         47   47                                    
159(36(38F.sub.3))                                                        
             59     55         54   38                                    
168(36(38F.sub.3))                                                        
             59     50         45   38                                    
101(38F.sub.3)                                                            
             60     55         48   44                                    
102(38F.sub.3)                                                            
             59     57         49   35                                    
______________________________________                                    
 *Supernatants with suppressor activity.                                  
 
    
     
                                           TABLE XIV                               
__________________________________________________________________________
INHIBITION OF PROLIFERATIVE RESPONSES OF BALB/C MOUSE                     
THYMOCYTES TO CON A, BY SUPERNATANTS FROM HUMAN T-T                       
CELL HYBRIDOMAS                                                           
           Counts per Minute                                              
           T-T Cell Hybrid Supernatants                                   
Supernatant                                                               
           159(36(38F3))                                                  
                     36(38F3)  169(86(38F3))                              
concentration                                                             
           Con A     Con A     Con A                                      
(% v/v)    3 μg/ml                                                     
                6 μg/ml                                                
                     3 μg/ml                                           
                          6 μg/ml                                      
                               3 μg/ml                                 
                                    6 μg/ml                            
__________________________________________________________________________
Thymocytes 89,930                                                         
                254,180                                                   
                     89,930                                               
                          254,180                                         
                                89,930                                    
                                    254,180                               
Thymocytes +2.5%                                                          
           8,295                                                          
                15,435                                                    
                     36,510                                               
                          93,573                                          
                               166,300                                    
                                    247,600                               
Thymocytes +5%                                                            
           3,050                                                          
                 3,553                                                    
                     40,708                                               
                          82,791                                          
                               180,519                                    
                                    302,994                               
Thymocytes +10%                                                           
           3,271                                                          
                 2,242                                                    
                     13,366                                               
                          14,998                                          
                               192,006                                    
                                    286,007                               
Thymocytes +20%                                                           
           4,132                                                          
                 2,700                                                    
                      7,531                                               
                           7,736                                          
                               202,671                                    
                                    298,623                               
__________________________________________________________________________
 
    
     The HLA type of the T-T cell hybridomas is shown in Table XV. 
     Some T-T cell hybridomas produce B-cell growth factor. These results are shown in table XVI. These hybridomas are different from the cells which produce SF. 
     These examples are for illustrative purposes only and are not meant to limit the invention. 
     
                       TABLE XV                                                    
______________________________________                                    
 HLA TYPING OF HUMAN T-T CELL HYBRIDOMAS                                  
______________________________________                                    
                Fusion Cell HLA:                                          
Donor:          A9, 19; B5, 12                                            
Jurkat:         A2; B7, 15                                                
                T-T Cell Hybridoma HLA:                                   
21F3:           A9, 19; B7, 12                                            
75(38F3):       A19; B5, 7                                                
13(185(38F3)):  A2, 9; B7, 12                                             
22(185(38F3)):  A9, 19; B5, 7, 15                                         
153(36(38F3)):  A9, 19; B12                                               
169(36(38F3)):  A2,19; B7, 12                                             
170(36(38F3)):  A9, 19; B5, 7, 12                                         
______________________________________                                    
 
    
     
                                           TABLE XVI                               
__________________________________________________________________________
HUMAN T-T CELL HYBRIDOMAS CONSTITUTIVELY PRODUCING                        
B-CELL GROWTH FACTOR (BCGF)                                               
                 Hybridoma                                                
                        CPM                                               
                 Supernatants                                             
                        Donor 1  Donor 2                                  
__________________________________________________________________________
E-rosette negative cells                                                  
                 None   1,843 ± 329                                    
                                 223 ± 99                              
&gt;&gt;          + SAC                                                         
                 None   41,152 ± 3,815                                 
                                 1,228 ± 158                           
&gt;&gt;          + SAC                                                         
                 15F3   44,143 ± 3,395                                 
                                 3,743 ± 774                           
&gt;&gt;          + SAC                                                         
                 16F3   37,538 ± 4,364                                 
                                 5,478 ± 379                           
&gt;&gt;          + SAC                                                         
                 56F3   41,547 ± 4,247                                 
                                 2,899 ± 613                           
&gt;&gt;          + SAC                                                         
                 41F3   39,571 ± 2,288                                 
                                 3,081 ± 489                           
&gt;&gt;          + SAC                                                         
                 24F3   225,288 ± 23,904                               
                                 47,744 ± 2,198                        
&gt;&gt;          + SAC                                                         
                 32F3   ND       274,999 ± 55,710                      
&gt;&gt;          + SAC                                                         
                 36F3   ND       157,874 ± 24,865                      
&gt;&gt;          + SAC                                                         
                 206F3  ND       243,662 ± 23,983                      
&gt;&gt;          + SAC                                                         
                 64F3   ND       253,039 ± 35,711                      
__________________________________________________________________________
 Proportion of hybridomas constitutively producting BCGF: 7-10%           
 Stability: one to two months