title: Evidence for the expression of Ia (H-2-associated) antigens on thymus-derived lymphocytes.
abstract: We have demonstrated in an anti-Ia serum the presence of specific antibodies reacting with T cells, as well as with B cells, using a highly sensitive dye exclusion test. This antiserum reacts with both spleen and lymph node in a characteristic biphasic titration curve killing up to 70% of these cells. It also reacts with cortisone-resistant thymocytes. The A.TH-alpha-A.TL serum can be absorbed with spleen, lymph node, cortisone-resistant thymus, or normal thymus cells. Further in vivo absorptions in BALB/c nude cannot remove all of the cytotoxic activity for normal BALB lymph node lymphocytes, while completely removing the activity for nude cells. A Thy-1 positive cell line derived from a C57Br leukemia is reactive with this anti-Ia serum.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D000918:Antibody Specificity; D000961:Antilymphocyte Serum; D003348:Cortisone / Q000494:pharmacology; D003601:Cytotoxicity Tests, Immunologic; D004912:Erythrocytes / Q000276:immunology; D005796:Genes; D006649:Histocompatibility Antigens; D008198:Lymph Nodes / Q000166:cytology; D051379:Mice; D008815:Mice, Inbred Strains / Q000276:immunology; D011817:Rabbits / Q000276:immunology; D012756:Sheep / Q000276:immunology; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology*
chemical_list: D000961:Antilymphocyte Serum; D006649:Histocompatibility Antigens; D003348:Cortisone