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Characterization of specific antibodies and the establishment of sandwich ELISA and ELISPOT systems for swine IL-4 |
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| Authors: | Nuntaprasert A Mori Y Fujita K Yoneda M Miura R Tsukiyama-Kohara K Kai C |
| Institution: | a Laboratory of Animal Research Center, Institution of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai Minato-ku, Tokyo 108-8639, Japan b National Institute of Animal Health, Tsukuba, Ibaraki 305-0856, Japan c Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand |
| Abstract: | We produced four monoclonal antibodies (mAb) and two polyclonal antibodies using the purified cytokine expressed in bacteria and characterized them. Specific binding of each of the mAb and polyclonal antibodies to recombinant swine IL-4 (rSwIL-4) purified from Escherichia coli and baculovirus was demonstrated in an indirect ELISA and/or in western blotting. We established a sandwich enzyme-linked immunosorbent assay (ELISA) for measuring concentration of SwIL-4 in biological samples and established an enzyme-linked immunospot (ELISPOT) assay for detecting IL-4-secreting cells using a mAb and a polyclonal IgG from goat. The detection limit of the sandwich ELISA for SwIL-4 was 78 pg/ml. Using sandwich ELISA, SwIL-4 was detected in the bronchoalveolar lavage fluid (BALF) of pigs experimentally infected with Mycoplasma hyopneumoniae and could quantitate in supernatants of mitogen-stimulated PBMC culture. The ELISPOT system is useful for the detection of IL-4 producing cells in swine PBMC culture. |
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