title: Distribution of a guinea pig lymphocyte cell surface antigen of defined function, as detected by the mouse monoclonal antibody MSgp 1.
abstract: A mouse anti-guinea pig monoclonal antibody, designated MSgp 1, was derived from a fusion between NS-1 myeloma cells and splenocytes hyperimmunised with guinea pig thymocytes. The MSgp 1 determinant is expressed by a subset of small thymocytes and lymph node T cells which participate in mixed leukocyte reactions. The determinant is modulated by antigen in vivo, and MSgp 1 antibody will prevent MHC class II driven proliferation in vitro. In addition, MSgp 1 reacts with a minor population of lymph node B cells, but not with a chronic B cell leukaemic cell line. Resident peritoneal macrophages express the MSgp 1 determinant, whereas chronic oil-induced peritoneal macrophages do not. The role of MSgp 1 defining guinea pig helper T cells is discussed by comparisons with other documented T helper cell reagents.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000918:Antibody Specificity; D000954:Antigens, Surface / Q000032:analysis* / Q000502:physiology; D000939:Epitopes / Q000276:immunology; D005455:Fluorescent Antibody Technique; D006168:Guinea Pigs; D008198:Lymph Nodes / Q000166:cytology; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D000939:Epitopes