reference now should be made to the drawings to describe the present invention in detail . fig1 is an illustration of a light irradiating device in accordance with an embodiment of the present invention . this light irradiation device comprises a body 10 housing an led light source 20 , designed to irradiate one of single wavelength - band rays with peaks of 610 ± 20 nm and 710 ± 30 nm . the body 10 may be cylindrical and may be provided at one end thereof with a bandpass filter through which the light generated from the led 20 passes to have a peak wavelength of 610 ± 20 nm or 710 ± 30 nm . with reference to fig2 and 3 , there are spectra of the light irradiated from the light irradiating device of the present invention that are 610 ± 20 nm and 710 ± 30 nm in peak wavelength , respectively . in accordance with an embodiment of the present invention , the body 10 may be provided with a controller for maintaining the emitted light from the led 20 at such a wavelength band as to have a peak wavelength of 610 ± 20 nm or 710 ± 30 nm and to be of a predetermined light intensity . the light emitted from the led 20 ranges in radiant power from 0 . 01 to 20 mw . an experimental result obtained in the development of the present invention indicates that when the light energy of the light emitted from the light irradiating device falls within the range 0 . 5 mj · cm − 2 & lt ; t × p & lt ; 5 j · cm − 2 wherein t is time of single radiation dose and p is light power density , desirable immunopentiation is obtained . in order for the light irradiating device of the present invention to have an influence on the immune system , an exposure time of at least 10 μs is required when the emitted light has a light radiant power of 0 . 01 ˜ 20 mw and a light power density of 5 μw · cm − 2 ˜ 5 kw · cm − 2 . the light irradiating device of the present invention was examined for effects on immunity through the following experiments conducted by the present inventors . a better understanding of the present invention may be obtained through the following examples which are set forth to illustrate , but are not to be construed as limiting the present invention . 35 male , specific pathogen - free sprague - dawley rats in their 8 th week of life were bred in a controlled room at 22 ° c . with a 12 - hour light / dark cycle by turning on and off fluorescent lamps and allowed to freely approach water and feedstuff . the experimental animals were handled at the institute of biomedical science and technology in konkuk university , korea , and the experimental protocols were approved by the institutional animal care and use committee of konkuk university . used were device a for irradiating light with a peak wavelength of 540 nm , device b for irradiating light with a peak wavelength of 610 nm , and device c for irradiating light with a peak wavelength of 710 nm . three of the devices were fabricated directly by the present inventors and employed led light sources and irradiated light with a radiant power of 0 . 047 mw . the experimental rates were divided into four groups : five exposed to the 540 nm light from device a ; eleven exposed to the 610 nm light from device b ; eleven exposed to 710 nm light from device c ; and eight as a non - exposed control . while eight control rats were under the fluorescent lamps of the breeding room during the 12 hour light cycle , the experimental groups were irradiated with the light of 540 nm , 610 nm and 710 nm wavelengths from devices a , b and c , respectively for the same time period . total rna was isolated from 1 ml of whole blood sampled from tail veins of the experimental rats using qiaamp rna blood mini ( qiagen gmbh , hilden , germany ) according to the instructions of the manufacturer . 2 μg of mrna was used for reverse transcription with superscript ii ( invitrogen , branfort , conn ., usa ). 2 μl of the cdna thus obtained was amplified by pcr . pcr primers for il - 1β , il - 4 , il - 6 and ifnγ are listed in table 1 , below . after initiation with denaturing at 94 ° c . for 2 min , pcr was performed with 30 cycles of denaturing at 94 ° c . for 20 sec , annealing at 58 ° c . for 40 sec and extension at 72 ° c . for 1 min . the pcr products thus obtained were identified by separation on 1 % agarose gel . from 1 . 5 ml of blood samples from the rats , monocytes were isolated with the aid of ficoll - paque ( amersham bioscience , uppsala , sweden ). cells were placed at a density of 5 × 10 5 cells per test tube into test tubes and treated on ice for 1 hour with 0 . 25 μg of a pe - conjugated anti - rat - cd4 antibody ( bd bioscience pharmigen , cambridge , u . k ) or a pe - conjugated anti - rat - cd8a antibody ( bd bioscience pharmigen , cambridge , u . k ), followed by washing twice with phosphate buffered saline ( pbs ) and 5 % fetal bovine serum . the cells were measured for fluorescence using a flow cytometer ( facs calibur , beckton - dickinson , mountain view , calif ., usa ) and analyzed using a cell quest pro program ( beckton - dickinson , mountain view , calif ., usa ). with reference to fig4 , pcr products obtained in experimental example 1 are visualized with ethidium bromide on agarose gel . as seen in this figure , the experimental groups exposed to 610 nm or 710 nm light were found to increase in il - 4 mrna level in comparison with the control , but not detected for ifnγ . an increase in the mrna level of il - 1β and il - 6 was observed from the 710 nm group , but with no statistical significance . no differences were found between the 540 nm group and the control with regard to the expression levels of il - 4 , il - 6 and ifnγ . thus , flow cytometry analysis was conducted only on the 610 nm group , the 710 nm group and the control as follows . [ results of flow cytometry analysis for cd4 + / cd8 + t lymphocytes ] along with the control , the 610 nm group and the 710 nm group were analyzed for the distribution of cd4 + and cd8 + t lymphocytes using facs . % distribution of cd4 + t lymphocytes in the 710 nm group was increased with a statistical significance ( p & lt ; 0 . 05 )), but neither the control nor the 610 nm group was observed to increase in the % distribution ( see fig5 and 6 ). in fig5 and 6 , the difference between the experimental groups was obtained using the one - way anova and the bonferroni procedure . significant difference for the distribution of cd8 + was detected in none of the groups . fig7 shows representative flow cytometry of the experimental groups after exposure to the light . when , after exposure to the light for four weeks ( 28 days ), the 710 nm group was not irradiated with the light for five weeks , as in the control , the light - induced cd4 + t lymphocyte increase was not detected , but the level was returned back to the control ( see fig8 ). the results from the flow cytometric analysis indicate that light with a peak wavelength of 710 nm induced the proliferation of cd4 + helper t lymphocytes . also , the results from the rt - pcr analysis show that the led radiation with a peak wavelength of 710 nm increases the level of il - 4 mrna , which is produced mainly in cd4 + helper t lymphocytes , supporting the results of the flow cytometry . in spite of its effective ability to proliferate cd4 + t lymphocytes , the led radiation with a peak wavelength of 710 nm was found to have no influence on the synthesis of the cytokines il - 1β and il - 6 , which are potential inducers of acute phase reactant proteins acting as inflammation indices . also , the led radiation with a peak wavelength of 610 nm was found to activate cd4 + helper t cells by increasing il - 4 mrna levels , as analyzed on dna level by rt - pcr . accordingly , it is expected that , when illuminated on the body , radiations with peaks at 610 nm ± 20 nm and at 710 ± 30 nm are useful in immunopoentiation and that the light irradiating device of the present invention may be installed in various goods . for example , when used as a light source for indoor lamps of rooms and vehicles , for instrument panels of vehicles , etc ., the light irradiating device of the present invention is expected to irradiate the body with radiations which are highly effective in immunopotentiation without interference with daily life activities . when equipped with a mounting means 30 , the light irradiating device of the present invention finds a further broad range of applications including neighboring structures ( computer monitors , electronic appliances , desks , etc .). although the preferred embodiments of the present invention have been disclosed for illustrative purposes , those skilled in the art will appreciate that various modifications , additions and substitutions are possible , without departing from the scope and spirit of the invention as disclosed in the accompanying claims .
disclosed are a light irradiating device for enhancing cell - mediated immunity and a method using the same . the light irradiating device generates a radiation with a specific peak wavelength at 610 ± 20 nm or 710 ± 30 nm which activates the structure of proteins involved in the activation of t lymphocytes responsible for cell - mediated immunity thus effecting immunopotentiation .