title: Antibodies to interleukin 2. Effects on immune responses in vitro and in vivo.
abstract: Antibodies to highly purified mouse interleukin 2 (IL-2) were raised in rabbits; a 1:500 dilution of antiserum completely blocked the in vitro mitogenic effect of 10(-9) M IL-2. The antisera functioned effectively to immunoprecipitate biosynthetically labeled IL-2 and the purified immunoglobulins were useful in the construction of affinity columns for the adsorption and one-step immunopurification of IL-2. The antibodies were apparently specific for IL-2 among the lymphokines, they did not block the biological effects of IL-1, IL-3, gamma-IFN, B cell stimulating factor(s), and cytotoxic T cell differentiation factor(s). When anti-IL-2 was added to the in vitro reactions, it blocked mixed leukocyte reactions (MLR) and associated lymphocyte proliferation, the in vitro generation of cytotoxic T cells, and antibody formation as assessed by erythrocyte-specific plaque-forming cells (PFC). When injected into mice, anti-IL-2 antibodies also reduced the formation of cytotoxic lymphocytes in response to allogeneic cells, suggesting that endogenous IL-2 participates in such reactions in vivo. Taken together, the results indicate that these IL-2 antibodies will be useful adjuncts in the analysis of immune response both in vivo and in vitro.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000008:administration & dosage / Q000502:physiology*; D000918:Antibody Specificity; D000937:Antigen-Antibody Reactions; D001667:Binding, Competitive; D011232:Chemical Precipitation; D003602:Cytotoxicity, Immunologic; D007376:Interleukin-2 / Q000276:immunology* / Q000378:metabolism / Q000502:physiology; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008819:Mice, Nude; D009500:Neutralization Tests; D012333:RNA, Messenger / Q000378:metabolism; D011817:Rabbits; D013601:T-Lymphocytes / Q000276:immunology; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology
chemical_list: D000906:Antibodies; D007376:Interleukin-2; D012333:RNA, Messenger