the present invention relates to the use of human tff1 dimer and tff3 dimer peptides for improving rheological properties of mucin solutions . tff dimer peptides have by the present inventors been found to increase the viscosity and elasticity of different mucins solutions , which are correlated to physiological and pathophysiological conditions . the present invention discloses the mechanism by which the tff dimer peptides exerts their biological activity , which are documented by a direct effect of tff dimer peptides on the viscosity and elasticity of mucin solutions . the tff dimer peptides significantly increases the viscosity of mucin solutions . the net effect is an increase in the viscosity of several times and can be visualised by the fact that the liquid mucin solution is converted into a more viscous gel - like substance . the tff dimer peptides have by the present inventors been found to be useful for increasing the viscosity and elasticity of mucus layers , which can be used in the treatment of many different indications , where abnormalities in existing mucus layers are present . the advantage over known therapies is , that treatment with tff dimer peptides represent a specific treatment at the site of injury without major side effects . for local and luminal applications tff dimer peptides can increase the viscosity and elastic properties of mucin in mucus layers , which may be useful in many different indications : 1 ) for the treatment of the oral mucosa . tff dimer peptides may be given alone or together with mucus - like preparations to patients with reduced secretion of saliva caused by irradiation therapy , treatment with anticholinergics or in patients with sjögrens syndrome . 2 ) for increasing the viscosity of nasal secretions in rhinorrhoea in common cold or allergic rhinitis . protection of the mucosa of respiratory tract following accidental inhalation of irritants , gases , dusts or fumes . 3 ) for protection of the distal part of the oesophagus against acid secretions from the stomach in reflux oesophagi &# 39 ; s , hiatus hernia , barrets oesophagus . 4 ) for the protection of the stomach against acute stress induced gastric ulcers secondary to trauma , shock , large operations , renal or lever diseases , or gastritis caused by treatment with aspirin or other nsaids , steroids or by alcohol . 5 ) for the treatment of acute or prolonged diarrhoea by increasing the viscosity of the intestinal secretions . 6 ) for the protection of the small intestinal and colonic mucosa in crohns disease , irritable bowel syndrome and ulcerative colitis . 7 ) in eye droplets to increase the viscosity of lacrimal fluid in patients with keratoconjunctivitis sicca / sjögren &# 39 ; s syndrome or “ dry eyes ” for other reasons . 8 ) local application especially in the knee joints to increase the viscosity of the synovial fluid in osteoarthritis and following joint replacement . parenteral tff dimer is taken up by cells associated with stem cells in the gastrointestinal tract . it can be used for protection of the stomach against stress - induced damage and the stomach and intestine against damage following irradiation or chemotherapy or in the treatment of acute excerbations in ulcerative colitis , irritable bowel syndrome or crohn &# 39 ; s disease . injected tff dimer peptide is excreted intact in urine and may increase the defence mechanism of the urinary bladder by binding to the layer of mucopolysaccharids that coat the urothelium and thereby interfere with the adherence of bacteria in chronic bladder infections , in patients with catheter or interstitial cystitis , or interfere with the binding of urinary growth factors in papillomas or cancer of the bladder . in a first aspect , the present invention relates to a pharmaceutical composition for increasing the viscosity of mucus layers in mammals , the composition comprising a tff dimer peptide or a pharmaceutically acceptable salt thereof . by “ tff dimer peptides ” or “ a tff dimer peptide ” is meant a protein that is substantially homologous to human tff1 or human tff3 in dimer forms . fig1 shows tff1 and tff3 in the monomer form . the tff1 dimer consists of two tff1 monomers linked together by a disulfide bond between cysteine amino acid residue at position 58 of each tff1 monomer . the tff3 dimer consists of two tff3 monomers linked together by a disulfide bond between cysteine amino acid residue at position 57 of each tff3 monomer . the term tff dimer peptides also includes analogs of naturally occurring tff dimer peptides . analogs can differ from naturally occurring tff dimer by amino acid sequence differences or by modifications that do not affect sequence , or by both . analogs of the invention will generally exhibit at least 70 %, more preferably 80 %, more preferably 90 %, and most preferably 95 % or even 99 %, homology with a naturally occurring tff dimer sequence . modifications include in vivo , or in vitro chemical derivatization of polypeptides , e . g ., acetylation , or carboxylation . also included are modifications of glycosylation , e . g ., those made by modifying the glycosylation patterns of a polypeptide during its synthesis and processing or in further processing steps , e . g ., by exposing the polypeptide to enzymes that affect glycosylation derived from cells that normally provide such processing , e . g ., mammalian glycosylation enzymes . also embraced are versions of the same primary amino acid sequence that have phosphorylated amino acid residues , e . g ., phosphotyrosine , phosphoserine , or phosphothreonine . in addition to substantially full - length polypeptides , the term tff dimer peptide , as used herein , includes biologically active fragments of the polypeptides . as used herein , the term “ fragment ,” as applied to a polypeptide , will ordinarily be at least 10 contiguous amino acids , typically at least 20 contiguous amino acids , more typically at least 30 contiguous amino acids , usually at least 40 contiguous amino acids , preferably at least 50 contiguous amino acids , and most preferably at least 60 to 80 or more contiguous amino acids in length . the ability of a candidate fragment to exhibit a biological activity of a tff dimer peptide can be assessed by methods known to those skilled in the art . also included in the term “ fragment ” are biologically active tff dimer peptides containing amino acids that are normally removed during protein processing , including additional amino acids that are not required for the biological activity of the polypeptide , or including additional amino acids that result from alternative mrna splicing or alternative protein processing events . a tff dimer peptide , including a fragment , or analog is biologically active if it exhibits a biological activity of a naturally occurring tff dimer , e . g ., the ability to alter viscosity or elasticity of mucin in mucus layers in a mammal . the term “ glycosylation ”, as used herein , means the post - translational modification of a peptide , wherein a carbohydrate molecule is covalently attached to the peptide . the glycosylation may take place in a eucaryotic host cell , such as a yeast cell or it may be done by chemical linkage in vitro after production of the peptide in a cell , e . g . the peptide could be produced in a bacteria and glycosylated in vitro afterwards . in a second aspect , the present invention relates to the use of a tff dimer peptide for the preparation of a medicament for increasing the viscosity of mucus layers in mammals . in a third aspect , the present invention relates to a method for in vivo increase in viscosity of mucus layers in a subject , the method comprising administering to the subject a composition comprising a ) a pharmaceutically acceptable carrier or diluent , b ) a therapeutically effective amount of a tff dimer peptide , and optionally c ) a mucin glycoprotein preparation , in another aspect , the present invention relates to the use of a tff dimer peptide for the treatment of conditions with increased viscosity of mucus layers in mammals . the term “ treatment ”, as used herein , means the administration of an effective amount of a therapeutically active compound of the invention with the purpose of preventing any symptoms or disease state to develop or with the purpose of curing or easing such symptoms or disease states already developed . the term “ treatment ” is thus meant to include prophylactic and protective treatment . the symptoms or disease state includes but is not limited to diseases , e . g . gastric ulcers or asthma , inherited biological disorders or conditions induced by damaging by external stimuli , e . g . inhalation of toxic or acidic chemical . another embodiment of the present invention relates to a pharmaceutical composition for local application . in a further embodiment the present invention relates to a pharmaceutical composition for luminal application . in a further embodiment the present invention relates to a pharmaceutical composition for parenteral administration . in a further embodiment the present invention relates to a pharmaceutical composition for oral administration . in a further embodiment the present invention relates to a pharmaceutical composition further comprising a mucin glycoprotein preparation . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of oral mucosa . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of patients with reduced secretion of saliva . in one embodiment , the reduced secretion of saliva is caused by irradiation therapy , treatment with anticholinergics or sjögrens syndrome . in a further embodiment , the present invention relates to a pharmaceutical composition for the treatment of patients receiving irradiation therapy . in a further embodiment , the present invention relates to a pharmaceutical composition for the treatment of patients treated with anticholinergics . in a further embodiment , the present invention relates to a pharmaceutical composition for the treatment of patients with sjögrens syndrome . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of the respiratory passages : in a further embodiment the present invention relates to a pharmaceutical composition for increasing the viscosity of nasal secretions in rhinorrhoea in common cold or allergic rhinitis . in a further embodiment , the present invention relates to a pharmaceutical composition for the treatment of patients with common cold . in a further embodiment , the present invention relates to a pharmaceutical composition for the treatment of patients with allergic rhinitis . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of the respiratory tract . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of the respiratory tract following accidental inhalation of irritants . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of the respiratory tract following accidental inhalation of gases , dusts or fumes . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of oesophagus . in one embodiment the present invention relates to a pharmaceutical composition for the treatment of the distal part of the oesophagus . in a further embodiment the present invention relates to a pharmaceutical composition for protection against acid secretions from the stomach . in a further embodiment the present invention relates to a pharmaceutical composition for protection against acid secretions from the stomach in reflux oesophagi &# 39 ; s . in a further embodiment the present invention relates to a pharmaceutical composition for protection against acid secretions from the stomach in hiatus hernia . in a further embodiment the present invention relates to a pharmaceutical composition for protection against acid secretions from the stomach in barrets oesophagus . in a further embodiment the present invention relates to a pharmaceutical corn position for the treatment of the stomach . in a further embodiment the present invention relates to a pharmaceutical composition for treatment of stress induced gastric ulcers . in one embodiment the stress induced gastric ulcers is secondary to trauma . in another embodiment the stress induced gastric ulcers is secondary to shock . in a further embodiment the stress induced gastric ulcers is secondary to large operations . in a further embodiment the stress induced gastric ulcers is secondary to renal diseases . in a further embodiment the stress induced gastric ulcers is secondary to lever diseases . in a further embodiment the stress induced gastric ulcers is secondary to treatment with aspirin , other non - steroidal anti - inflammatory drugs ( nsaids ), steroids or alcohol . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of diarrhoea . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of the small intestinal mucosa . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of the colonic mucosa . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of crohns disease . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of irritable bowel syndrome . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of ulcerative colitis . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of the eye . in a further embodiment the present invention relates to a pharmaceutical composition for increasing the viscosity of lacrimal fluid . in a further embodiment the present invention relates to a pharmaceutical composition for increasing the viscosity of lacrimal fluid in patients with keratoconjunctivitis sicca . in a further embodiment the present invention relates to a pharmaceutical composition for increasing the viscosity of lacrimal fluid in patients with sjögren &# 39 ; s syndrome . in a further embodiment the present invention relates to a pharmaceutical composition for increasing the viscosity of lacrimal fluid in patients with dry eyes . the term “ dry eyes ”, as used herein , means any condition where the eyes feels dry . in a further embodiment the present invention relates to a pharmaceutical composition in eye droplets . in a further embodiment the present invention relates to a pharmaceutical corn position for the treatment of the knee joints . in a further embodiment the present invention relates to a pharmaceutical composition for increasing the viscosity of the synovial fluid . in a further embodiment the present invention relates to a pharmaceutical composition for increasing the viscosity of the synovial fluid in osteoarthritis . in a further embodiment the present invention relates to a pharmaceutical composition for increasing the viscosity of the synovial fluid following joint replacement . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of the bladder . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of patients with catheter . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of infections . in one embodiment the infection is a cronic infection of the bladder . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of interstitial cystitis . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of papillomas . in a further embodiment the present invention relates to a pharmaceutical composition for the treatment of cancer . in a further embodiment of the invention , the tff dimer peptide is recombinant human tff1 . in a further embodiment of the invention , the tff dimer peptide is recombinant human tff3 . in a further embodiment of the invention , the tff dimer peptide is glycosylated . tff dimer peptides are typically produced by recombinant dna techniques . to this end , a dna sequence encoding the tff dimer peptide may be isolated by preparing a genomic or cdna library and screening for dna sequences coding for all or part of the peptide by hybridization using synthetic oligonucleotide probes in accordance with standard techniques ( cf . sambrook et al ., molecular cloning : a laboratory manual , cold spring harbor laboratory , cold spring harbor , n . y ., 1989 ). for the present purpose , the dna sequence encoding the peptide is preferably of human origin , i . e . derived from a human genomic dna or cdna library . the dna sequences encoding the tff dimer peptides may also be prepared synthetically by established standard methods , e . g . the phosphoamidite method described by beaucage and caruthers , tetrahedron letters 22 ( 1981 ), 1859 - 1869 , or the method described by matthes et al ., embo journal 3 ( 1984 ), 801 - 805 . according to the phosphoamidite method , oligonucleotides are synthesized , e . g . in an automatic dna synthesizer , purified , annealed , ligated and cloned in suitable vectors . the dna sequences may also be prepared by polymerase chain reaction using specific primers , for instance as described in u . s . pat . no . 4 , 683 , 202 , saiki et al ., science 239 ( 1988 ), 487 - 491 , or sambrook et al ., supra . the dna sequences encoding the tff dimer peptides are usually inserted into a recombinant vector which may be any vector , which may conveniently be subjected to recombinant dna procedures , and the choice of vector will often depend on the host cell into which it is to be introduced . thus , the vector may be an autonomously replicating vector , i . e . a vector , which exists as an extrachromosomal entity , the replication of which is independent of chromosomal replication , e . g . a plasmid . alternatively , the vector may be one which , when introduced into a host cell , is integrated into the host cell genome and replicated together with the chromosome ( s ) into which it has been integrated . the vector is preferably an expression vector in which the dna sequence encoding the tff dimer peptide is operably linked to additional segments required for transcription of the dna . in general , the expression vector is derived from plasmid or viral dna , or may contain elements of both . the term , “ operably linked ” indicates that the segments are arranged so that they function in concert for their intended purposes , e . g . transcription initiates in a promoter and proceeds through the dna sequence coding for the polypeptide . the promoter may be any dna sequence , which shows transcriptional activity in the host cell of choice and may be derived from genes encoding proteins either homologous or heterologous to the host cell . examples of suitable promoters for directing the transcription of the dna encoding the tff dimer peptide in mammalian cells are the sv40 promoter ( subramani et al ., mol . cell biol . 1 ( 1981 ), 854 - 864 ), the mt - 1 ( metallothionein gene ) promoter ( palmiter et al ., science 222 ( 1983 ), 809 - 814 ) or the adenovirus 2 major late promoter . an example of a suitable promoter for use in insect cells is the polyhedrin promoter ( u . s . pat . no . 4 , 745 , 051 ; vasuvedan et al ., febs lett . 311 , ( 1992 ) 7 - 11 ), the p10 promoter ( j . m . vlak et al ., j . gen . virology 69 1988 , pp . 765 - 776 ), the autographa californica polyhedrosis virus basic protein promoter ( ep 397 485 ), the baculovirus immediate early gene 1 promoter ( u . s . pat . no . 5 , 155 , 037 ; u . s . pat . no . 5 , 162 , 222 ), or the baculovirus 39k delayed - early gene promoter ( u . s . pat . no . 5 , 155 , 037 ; u . s . pat . no . 5 , 162 , 222 ). examples of suitable promoters for use in yeast host cells include promoters from yeast glycolytic genes ( hitzeman et al ., j . biol . chem . 255 ( 1980 ), 12073 - 12080 ; alber and kawasaki , j . mol . appl . gen . 1 ( 1982 ), 419 - 434 ) or alcohol dehydrogenase genes ( young et al ., in genetic engineering of microorganisms for chemicals ( hollaender et al , eds . ), plenum press , new york , 1982 ), or the tpi1 ( u . s . pat . no . 4 , 599 , 311 ) or adh2 - 4c ( russell et al ., nature 304 ( 1983 ), 652 - 654 ) promoters . examples of suitable promoters for use in filamentous fungus host cells are , for instance , the adh3 promoter ( mcknight et al ., the embo j . 4 ( 1985 ), 2093 - 2099 ) or the tpia promoter . examples of other useful promoters are those derived from the gene encoding a . oryzae taka amylase , rhizomucor miehei aspartic proteinase , a . niger neutral - amylase , a . niger acid stable - amylase , a . niger or a . awamori glucoamylase ( glua ), rhizomucor miehei lipase , a . oryzae alkaline protease , a . oryzae triose phosphate isomerase or a . nidulans acetamidase . preferred are the taka - amylase and glua promoters . suitable promoters are mentioned in , e . g . ep 238 023 and ep 383 779 . the dna sequence encoding the tff dimer peptides may also , if necessary , be operably connected to a suitable terminator , such as the human growth hormone terminator ( palmiter et al ., science 222 , 1983 , pp . 809 - 814 ) or the tpi1 ( alber and kawasaki , j . mol . appl . gen . 1 , 1982 , pp . 419 - 434 ) or adh3 ( mcknight et al ., the embo j . 4 , 1985 , pp . 2093 - 2099 ) terminators . the vector may further comprise elements such as polyadenylation signals ( e . g . from sv40 or the adenovirus 5 elb region ), transcriptional enhancer sequences ( e . g . the sv40 enhancer ) and translational enhancer sequences ( e . g . the ones encoding adenovirus va rnas ). the recombinant vector may further comprise a dna sequence enabling the vector to replicate in the host cell in question . an example of such a sequence ( when the host cell is a mammalian cell ) is the sv40 origin of replication . when the host cell is a yeast cell , suitable sequences enabling the vector to replicate are the yeast plasmid 2 replication genes rep 1 - 3 and origin of replication . the vector may also comprise a selectable marker , e . g . a gene the product of which complements a defect in the host cell , such as the gene coding for dihydrofolate reductase ( dhfr ) or the schizosaccharomyces pombe tpi gene ( described by p . r . russell , gene 40 , 1985 , pp . 125 - 130 ), or one which confers resistance to a drug , e . g . ampicillin , kanamycin , tetracyclin , chloramphenicol , neomycin , hygromycin or methotrexate . for filamentous fungi , selectable markers include amds , pyrg , argb , niad or sc . to direct a tff dimer peptide of the present invention into the secretory pathway of the host cells , a secretory signal sequence ( also known as a leader sequence , prepro sequence or pre sequence ) may be provided in the recombinant vector . the secretory signal sequence is joined to the dna sequence encoding the tff dimer peptide in the correct reading frame . secretory signal sequences are commonly positioned 5 ′ to the dna sequence encoding the peptide . the secretory signal sequence may be that , normally associated with the peptide or may be from a gene encoding another secreted protein . for secretion from yeast cells , the secretory signal sequence may encode any signal peptide , which ensures efficient direction of the expressed tff dimer peptide into the secretory pathway of the cell . the signal peptide may be naturally occurring signal peptide , or a functional part thereof , or it may be a synthetic peptide . suitable signal peptides have been found to be the - factor signal peptide ( cf . u . s . pat . no . 4 , 870 , 008 ), the signal peptide of mouse salivary amylase ( cf . o . hagenbuchle et al ., nature 289 , 1981 , pp . 643 - 646 ), a modified carboxypeptidase signal peptide ( cf . l . a . valls et al ., cell 48 , 1987 , pp . 887 - 897 ), the yeast bar1 signal peptide ( cf . wo 87 / 02670 ), or the yeast aspartic protease 3 ( yap3 ) signal peptide ( cf . m . egel - mitani et al ., yeast 6 , 1990 , pp . 127 - 137 ). for efficient secretion in yeast , a sequence encoding a leader peptide may also be inserted downstream of the signal sequence and upstream of the dna sequence encoding the tff dimer peptide . the function of the leader peptide is to allow the expressed peptide to be directed from the endoplasmic reticulum to the golgi apparatus and further to a secretory vesicle for secretion into the culture medium ( i . e . exportation of the tff dimer peptide across the cell wall or at least through the cellular membrane into the periplasmic space of the yeast cell ). the leader peptide may be the yeast - factor leader ( the use of which is described in e . g . u . s . pat . no . 4 , 546 , 082 , u . s . pat . no . 4 , 870 , 008 , ep 16 201 , ep 123 294 , ep 123 544 and ep 163 529 ). alternatively , the leader peptide may be a synthetic leader peptide , which is to say a leader peptide not found in nature . synthetic leader peptides may , for instance , be constructed as described in wo 89 / 02463 or wo 92 / 11378 . for use in filamentous fungi , the signal peptide may conveniently be derived from a gene encoding an aspergillus sp . amylase or glucoamylase , a gene encoding a rhizomucor miehei lipase or protease or a humicola lanuginosa lipase . the signal peptide is preferably derived from a gene encoding a . oryzae taka amylase , a . niger neutral - amylase , a . niger acid - stable amylase , or a . niger glucoamylase . suitable signal peptides are disclosed in , e . g . ep 238 023 and ep 215 594 . for use in insect cells , the signal peptide may conveniently be derived from an insect gene ( cf . wo 90 / 05783 ), such as the lepidopteran manduca sexta adipokinetic hormone precursor signal peptide ( cf . u . s . pat . no . 5 , 023 , 328 ). the procedures used to ligate the dna sequences coding for the tff dimer peptide , the promoter and optionally the terminator and / or secretory signal sequence , respectively , and to insert them into suitable vectors containing the information necessary for replication , are well known to persons skilled in the art ( cf ., for instance , sambrook et al ., molecular cloning : a laboratory manual , cold spring harbor , n . y ., 1989 ). the host cell into which the dna sequence encoding the tff dimer peptide is introduced may be any cell , which is capable of producing the posttranslational modified tff dimer peptide and includes yeast , fungi and higher eucaryotic cells . examples of suitable mammalian cell lines are the cos ( atcc crl 1650 ), bhk ( atcc crl 1632 , atcc ccl 10 ), chl ( atcc ccl39 ) or cho ( atcc ccl 61 ) cell lines . methods of transfecting mammalian cells and expressing dna sequences introduced in the cells are described in e . g . kaufman and sharp , j . mol . biol . 159 ( 1982 ), 601 - 621 ; southern and berg , j . mol . appl . genet . 1 ( 1982 ), 327 - 341 ; loyter et al ., proc . natl . acad . sci . usa 79 ( 1982 ), 422 - 426 ; wigler et al ., cell 14 ( 1978 ), 725 ; corsaro and pearson , somatic cell genetics 7 ( 1981 ), 603 , graham and van der eb , virology 52 ( 1973 ), 456 ; and neumann et al ., embo j . 1 ( 1982 ), 841 - 845 . examples of suitable yeasts cells include cells of saccharomyces spp . or schizosaccharomyces spp ., in particular strains of saccharomyces cerevisiae or saccharomyces kluyveri . methods for transforming yeast cells with heterologous dna and producing heterologous polypeptides there from are described , e . g . in u . s . pat . no . 4 , 599 , 311 , u . s . pat . no . 4 , 931 , 373 , u . s . pat . nos . 4 , 870 , 008 , 5 , 037 , 743 , and u . s . pat . no . 4 , 845 , 075 , all of which are hereby incorporated by reference . transformed cells are selected by a phenotype determined by a selectable marker , commonly drug resistance or the ability to grow in the absence of a particular nutrient , e . g . leucine . a preferred vector for use in yeast is the pot1 vector disclosed in u . s . pat . no . 4 , 931 , 373 . the dna sequence encoding the tff dimer peptide may be preceded by a signal sequence and optionally a leader sequence , e . g . as described above . further examples of suitable yeast cells are strains of kluyveromyces , such as k . lactis , hansenula , e . g . h . polymorpha , or pichia , e . g . p . pastoris ( cf . gleeson et al ., j . gen . microbiol . 132 , 1986 , pp . 3459 - 3465 ; u . s . pat . no . 4 , 882 , 279 ). examples of other fungal cells are cells of filamentous fungi , e . g . aspergillus spp ., neurospora spp ., fusarium spp . or trichoderma spp ., in particular strains of a . oryzae , a . nidulans or a . niger . the use of aspergillus spp . for the expression of proteins is described in , e . g ., ep 272 277 , ep 238 023 , ep 184 438 the transformation of f . oxysporum may , for instance , be carried out as described by malardier et al ., 1989 , gene 78 : 147 - 156 . the transformation of trichoderma spp . may be performed for instance as described in ep 244 234 . when a filamentous fungus is used as the host cell , it may be transformed with the dna construct of the invention , conveniently by integrating the dna construct in the host chromosome to obtain a recombinant host cell . this integration is generally considered to be an advantage as the dna sequence is more likely to be stably maintained in the cell . integration of the dna constructs into the host chromosome may be performed according to conventional methods , e . g . by homologous or heterologous recombination . transformation of insect cells and production of heterologous polypeptides therein may be performed as described in u . s . pat . no . 4 , 745 , 051 ; u . s . pat . no . 4 , 879 , 236 ; u . s . pat . nos . 5 , 155 , 037 ; 5 , 162 , 222 ; ep 397 , 485 ) all of which are incorporated herein by reference . the insect cell line used as the host may suitably be a lepidoptera cell line , such as spodoptera frugiperda cells or trichoplusia ni cells ( cf . u . s . pat . no . 5 , 077 , 214 ). culture conditions may suitably be as described in , for instance , wo 89 / 01029 or wo 89 / 01028 , or any of the aforementioned references . the transformed or transfected host cell described above is then cultured in a suitable nutrient medium under conditions permitting expression of the tff dimer peptides after which all or part of the resulting peptide may be recovered from the culture . the medium used to culture the cells may be any conventional medium suitable for growing the host cells , such as minimal or complex media containing appropriate supplements . suitable media are available from commercial suppliers or may be prepared according to published recipes ( e . g . in catalogues of the american type culture collection ). the tff dimer peptides produced by the cells may then be recovered from the culture medium by conventional procedures including separating the host cells from the medium by centrifugation or filtration , precipitating the proteinaqueous components of the supernatant or filtrate by means of a salt , e . g . ammonium sulphate , purification by a variety of chromatographic procedures , e . g . ion exchange chromatography , gelfiltration chromatography , affinity chromatography , or the like , dependent on the type of polypeptide in question . in the pharmaceutical composition of the invention , the tff dimer peptides may be formulated by any of the established methods of formulating pharmaceutical compositions , e . g . as described in remington &# 39 ; s pharmaceutical sciences , 1985 . the composition may be in a form suited for systemic injection or infusion and may , as such , be formulated with sterile water or an isotonic saline or glucose solution . the compositions may be sterilized by conventional sterilization techniques , which are well known in the art . the resulting aqueous solutions may be packaged for use or filtered under aseptic conditions and lyophilized , the lyophilized preparation being combined with the sterile aqueous solution prior to administration . the composition may contain pharmaceutically acceptable auxiliary substances as required to approximate physiological conditions , such as buffering agents , tonicity adjusting agents and the like , for instance sodium acetate , sodium lactate , sodium chloride , potassium chloride , calcium chloride , etc . the pharmaceutical composition of the present invention may also be adapted for nasal , transdermal or rectal administration . the pharmaceutically acceptable carrier or diluent employed in the composition may be any conventional solid carrier . examples of solid carriers are lactose , terra alba , sucrose , talc , gelatin , agar , pectin , acacia , magnesium stearate and stearic acid . similarly , the carrier or diluent may include any sustained release material known in the art , such as glyceryl monostearate or glyceryl distearate , alone or mixed with a wax . the amount of solid carrier will vary widely but will usually be from about 25 mg to about 1 g . the concentration of the tff dimer peptides in the composition may vary widely , i . e . from about 5 % to about 100 % by weight . a typical concentration is in the range of 50 - 100 % by weight a unit dosage of the composition may contain from about 1 mg to about 200 mg , typically from about 25 mg to about 75 mg , such as about 50 mg , of the peptide . the term “ a therapheutically effective amount ” is the effective dose to be determined by a qualified practitioner , who may titrate dosages to achieve the desired response . factors for consideration of dose will include potency , bioavailability , desired pharmacokinetic / pharmacodynamic profiles , condition of treatment ( e . g . trauma , ulcerative colitis , gastric ulcers ), patient - related factors ( e . g . weight , health , age , etc . ), presence of co - administered medications , time of administration , or other factors known to a medical practitioner . the dosage of a tff dimer peptide administered to a patient will vary with the type and severity of the condition to be treated , but is generally in the range of 0 . 1 - 1 . 0 mg / kg body weight . the term “ subject ” as used herein is intended to mean any animal , in particular mammals , such as humans , and may , where appropriate , be used interchangeably with the term “ patient ”. the present invention is further illustrated by the following examples which , however , are not to be construed as limiting the scope of protection . the features disclosed in the foregoing description and in the following examples may , both separately and in any combination thereof , be material for realizing the invention in diverse forms thereof . mucin i : crude mucin , type ii from porcine stomach ( sigma , st . louis , mo ., usa ). the dimer form of recombinant human tff3 was prepared as previously described ( thim , l . et al . ( 1995 ) biochemistry 34 , 4757 - 4764 ). the dimer form of recombinant human tff1 is prepared as previously described ( kannan , r . et al . ( 2001 ) protein expression and purification 21 , 92 - 98 ) mucin solutions . a 10 % ( w / v ) solution of mucin i was prepared and tff dimer peptides were dissolved in water and added to the mucin solution . after mixing the sample ( vortex mixer ), the sample was allowed to stand for 5 min . and the viscosity was visually assessed in relation to a control solution of mucin added water without tff dimer peptides . the detailed experimental conditions for the rheometer measurement are given in the figure legends . rheological measurements . rheological properties were measured by the use of a rotational reologica rheometer ( reologica instriments ab , lund , sweden ). the instrument is equipped with a stainless steel c40 4 cone - plate ( 40 mm diameter plate with an angle of 4 degree ) requiring a sample volume of at least 1 . 2 ml . the instrument was operated using instrument standard software ( version 3 . 6 ) allowing several different types of measurements . in the present study we have used the measuring programs : constant rate ( viscosity and stress as a function of shear rate ), oscillation ( complex viscosity , elastic modulus and viscous modulus at different frequencies ) and oscillation stress sweep ( to identify the stress range inside which the measurement results are linear i . e . independent of the applied stress ). a visual assessment of the change in properties that could be observed when tff dimer peptides was added to mucin solutions was made ( table 1 ). in some experiments the effect was astonishing . the addition of tff dimer peptides to mucin solutions resulted in a significant visual increase in viscosity ( table 1 ). mucin solutions and mucin / tff dimer peptide gel - like substances . mucin solutions to which a tff dimer peptide was added was compared . as can be seen from fig2 the mucin solution alone behaves as a non - newtonian liquid . these liquids can be described by the ostwald de waele model ( power law ) ( barnes , h . a . ( 1989 ) an introduction to rheology . elsevier and ferguson , j . and kemblowski , z . ( 1991 ) applied fluid rheology . elsevier ): where δ = shear stress , γ = shear rate and n and k are constants specific for the solution ( if n = 1 the solution is newtonian ). in the present case the following values could be calculated from fig2 : n = 0 . 75 and k = 0 . 35 . since n & lt ; 1 the solution is called shear - tinning , which is the characteristics of dispensions with asymmetric particles or emulsions . however , since the n value is close to 1 the solution is not far from being newtonian . as can also be seen from fig2 the viscosity varies from 0 . 34 pa s at low shear rates to 0 . 12 pa s at high shear rates . in order to characterise the mucin / tff dimer peptide gel - like structure , the technique of oscillatory measurement in which the gel - like material are subjected to a sinusoidaily varying stress is applied and the strain response is measured . before this measurement is carried out an oscillation stress sweep programme is used to define the so - called linear viscoelastic region . inside this region no change of the mucin / tff dimer peptide structure occurs and the relation between the applied stress and the measured quantities is linear . fig3 shows the result from the oscillatory measurement of the mucin solution alone ( fig3 a ) and the mucin / tff3 dimer peptide gel - like material ( fig3 b ). this type of experiments allow the estimation of several rheological parameters as a function of frequency : complex viscosity η *, elastic modulus g ′ and viscous modulus g ″ ( for detailed rheological theory see barnes , h . a . ( 1989 ) an introduction to rheology . elsevier and ferguson , j . and kemblowski , z . ( 1991 ) applied fluid rheology . elsevier ) a comparison of the absolute values of the elastic and viscous moduli of the mucin solution and the mucin / tff3 dimer peptide gel - like material is given in table 2 . as can be seen from these results both the elastic modulus and the viscous modulus are dramatically increased in the mucin / tff3 dimer peptide gel - like structure as compared to the mucin solution . fig4 shows the change in viscosity of the mucin i solution obtained by the addition of tff3 dimer peptides . the tff3 dimer peptides had a significant effect on the viscosity of the mucin solution . the addition of the tff3 dimer peptides resulted in a mucus solution with 1 - 4 mm fiber - like structures surrounded by liquid solution . methods : 32 female wistar rats weighing 200 g were used in the study . the effect of luminal tff3 was investigated in two rat models of colitis — the mitomycin c induced colitis model ( keshavarzian a . et al . j . lab clin . med . 1992 ; 120 : 778 - 91 ) and the dextran induced colitis model ( mottet n k . gastroenterology 1972 ; 62 : 1269 - 71 ). tff3 was administrated directly into the proximal part of the colon by means of a soft polyethylene tube which in anaesthezised rats at a laparotomy , was inserted into the colonic lumen , secured by 6 - 0 silk sutures and lead subcutaneously to the neck region of the rat . after this operation the rats had a recovery period of 6 days . mitomycin c colitis : in 16 rats colitis was induced by means of mitomycin c , 3 . 75 mg / kg . eight of the rats were given tff3 , 5 mg / kg in 0 . 5 ml h 2 o , two times each day from day 4 - 7 into the colonic tube . the 8 controls received nacl . the rats were sacrificed by means of an overdose of barbiturate 8 days after mitomycin administration . the colon was fixed by intraluminal injection of 10 % formalin , and after 10 minutes opened and suspended on a polyethylene plate . after further 24 hours fixation the specimens were flushed with water and surface stained with 0 . 3 % alcian green 3bx . the colonic specimens were investigated by means of a wild photomacroscope — the extent of disease and the number of ulcerations were quantitated . for histologic analysis specimens were taken out ( in a blinded way ) from the proximal , middle and distal colon and embedded in paraffin . histologic sections of 5 μm were stained with pas - hematoxylin - aurentia . the severety of colitis was scored by means of a histologic colitis score ( fig5 , williams k l . et al . gastroenterology 2001 ; 120 : 925 - 37 ). results : intraluminal treatment with tff3 did significantly reduce the overall colitis score ( 3 . 4 v . s . 10 . 8 ; p & lt ; 0 . 01 , ( fig6 )). when the mid segment and the distal colon were compared there was similar treatment effect in both sites ( data not shown ). dextran colitis : in 16 rats colitis was induced by means of dextran sulphate sodium 5 % administered in the drinking water . eight of the rats were given tff3 , 5 mg / kg in 0 . 5 ml h 2 o into the colonic tube , two times each day from the day before the initiation of dextran supplementation till day 9 , where the rats were sacrificed . the 8 controls recieved nacl . the rats were sacrificed by means of an overdose of barbiturate . the colon was fixed by intraluminal injection of 10 % formalin , and after 10 minutes opened and suspended on a polyethylene plate . after further 24 hours fixation the specimens were flushed with water and surface stained with 0 . 3 % alcian green 3bx . the colonic specimens were investigated by means of a wild photomacroscope — the extent of disease and the number of ulcerations were quantitated . for histologic analysis specimens were taken out ( in a blinded way ) from the proximal , middle and distal colon and embedded in paraffin . histologic sections of 5 μm were stained with pas - hematoxylin - aurentia . the severety of colitis was scored by means of a histologic colitis score ( williams k l . et al . gastroenterology 2001 ; 120 : 925 - 37 ). results : intraluminal treatment with tff3 had a significant effect on the overall colitis score ( 1 . 1 v . s . 3 . 18 ; p & lt ; 0 . 05 ( fig6 )). the effect was predominantly in the midsection of the colon close to the site where the tff3 had been introduced into the colonic lumen . in the midsegment the histologic colitis score was reduced following tff3 ( 0 . 4 vs 1 . 8 ; p & lt ; 0 . 05 ( fig7 )). conclusion : infraluminal treatment with tff3 reduces the severity of mitomycin induced colitis as well as dextran induced colitis in rats .
the present invention relates to the use of trefoil factor 1 and trefoil factor 3 dimers and a pharmaceutical composition comprising tff dimers for increasing the viscosity of mucin in mucus layers and the repair of damaged mucus layers in the gastrointestinal tract the respiratory passages , the eye , the urinary system and the cervis uteri .