title: T cell antiidiotypic antibodies reveal differences between two human leukemias.
abstract: Two different human T cell leukemias were compared, using antiidiotype-like murine monoclonal antibodies. In each case these antibodies immunoprecipitated disulfide-linked heterodimer molecules from their respective leukemic cells. On sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) analysis of the two idiotype-bearing molecules a major difference in molecular weight was observed, which could be attributed to a similar difference in size of the heavily iodinated chain of either heterodimer. The lightly iodinated chains of both molecules co-migrated at 43 Kd, but appeared to have different isoelectric points on two-dimensional gel analysis. The possibility that these two different heterodimers correspond to different classes of the putative T cell receptor for antigen is discussed. Assays of proliferation of the leukemic cells using Sepharose-bound antiidiotype-like monoclonal antibody showed that one of the leukemic cell types proliferated readily in response to its antiidiotypic antibody. This proliferation was not associated with measurable production of IL-2 and appeared to be a direct effect of the antiidiotypic antibody, which may mimic antigen in its interaction with the T cell receptor for antigen. The other leukemic cell type did not respond to Sepharose-bound antiidiotypic antibody and was generally unresponsive to lymphokines and mitogens. It is possible that the two leukemic cell types represent different stages of T cell differentiation.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis / Q000502:physiology; D000918:Antibody Specificity; D000937:Antigen-Antibody Reactions; D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface / Q000378:metabolism; D006801:Humans; D007130:Immunoglobulin Idiotypes / Q000276:immunology* / Q000378:metabolism; D007376:Interleukin-2 / Q000502:physiology; D007945:Leukemia, Lymphoid / Q000276:immunology*; D008213:Lymphocyte Activation; D051379:Mice; D011233:Precipitin Tests; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface; D007130:Immunoglobulin Idiotypes; D007376:Interleukin-2