title: H-2-restricted helper factor secreted by clone hybridoma cells.
abstract: Biological and serological characteristics of a helper factor secreted by cloned hybridoma cells was described. The factor is carrier specific and contains determinants shared with immunoglobulin VH bu does not react with V kappa- or V lambda-specific antibodies. Presence of four H-2I-controlled antigenic specificities, Ia.ml, Ia.m2, Ia.17, and Ia.m7, was detected. Hence, it is possible that both A beta and E alpha loci may be involved in its control. Helper effect could be obtained only toward B cell sources that shared the H-2K and I-A antigens with the hybridoma cells. Similarly, the factor was absorbed only by spleen cells syngeneic in I-A. Previous studies have demonstrated that this clone binds antigen in an H-2-restricted manner. It follows that H-2-restricted helper cells produce H-2-restricted helper factors. Hence, they support the view that specific T cell factors may represent secreted T cell receptors.
mesh_terms: D000818:Animals; D003429:Cross Reactions; D000939:Epitopes; D006183:H-2 Antigens; D000949:Histocompatibility Antigens Class II; D006825:Hybridomas / Q000276:immunology*; D007135:Immunoglobulin Variable Region / Q000276:immunology; D007375:Interleukin-1; D008211:Lymphocyte Cooperation; D051379:Mice; D011506:Proteins / Q000276:immunology*; D011948:Receptors, Antigen, T-Cell / Q000276:immunology
chemical_list: D000939:Epitopes; D006183:H-2 Antigens; D000949:Histocompatibility Antigens Class II; D007135:Immunoglobulin Variable Region; D007375:Interleukin-1; D011506:Proteins; D011948:Receptors, Antigen, T-Cell