title: Recognition of exon-shuffled class II molecules by T helper cells.
abstract: Exon shuffled I-A beta genes transfected into the B lymphoma cell line A20-2J were used to localize the epitope recognized by the monoclonal antibody 10.2.16 to the carboxy terminal portion of the beta 1 domain. In addition, several T helper cell hybrids were tested against these novel I-A molecules and the following observations were made: the beta 1 domain of A beta plays a dominant role in the restricted recognition by T helper cells; there appear to be multiple restriction epitopes on the I-A molecule; these epitopes can consist of conformational epitopes created by specific alpha and beta chains or consist of the polymorphic determinants encoded on the beta chain alone, and these novel I-A molecules serve as restriction elements in the antigen-specific recognition by T cells and in one case stimulate an alloreaction in the absence of antigen.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal; D001483:Base Sequence; D002460:Cell Line; D005434:Flow Cytometry; D005802:Genes, MHC Class II; D000949:Histocompatibility Antigens Class II / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D006825:Hybridomas / Q000276:immunology; D008213:Lymphocyte Activation; D051379:Mice; D011948:Receptors, Antigen, T-Cell / Q000235:genetics; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology* / Q000378:metabolism; D014162:Transfection
chemical_list: D000911:Antibodies, Monoclonal; D000949:Histocompatibility Antigens Class II; D011948:Receptors, Antigen, T-Cell