title: Cyclosporin A inhibits helper/inducer surface antigen expression on activated human lymphocytes.
abstract: Helper/inducer (H/I) and cytotoxic/suppressor (C/S) subpopulations of human peripheral blood mononuclear lymphocytes (PBL) were cultured with Concanavalin A (Con A) and Cyclosporin A (CsA) to determine effects on proliferation and surface marker expression. After 72 h in culture, CsA strongly inhibited Con A induced proliferation of H/I and C/S subpopulations in a manner similar to that observed for whole PBL. By flow cytometric analysis, enhanced expression of both the Leu-2a (C/S) and Leu-3a (H/I) surface markers was observed on PBL from con A treated cultures. Addition of CsA to these cultures inhibited the enhanced expression of Leu-3a more than that of Leu-2a. Studies showed that this CsA inhibition of enhanced Leu-3 antigen expression occurred in a concentration dependent manner, was statistically significant throughout a 4 day culture period and did not require addition of C/S cells to mediate the effect. The data suggest that CsA blocks Con A induced blastogenesis at an early stage of activation.
authors.forename: P
authors.initials: P
authors.lastname: Marder
authors.forename: J R
authors.initials: JR
authors.lastname: Schmidtke
mesh_terms: D000328:Adult; D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface / Q000032:analysis / Q000276:immunology*; D002478:Cells, Cultured; D003208:Concanavalin A / Q000037:antagonists & inhibitors; D003524:Cyclosporins / Q000494:pharmacology*; D006801:Humans; D007700:Kinetics; D008213:Lymphocyte Activation / Q000187:drug effects; D008775:Methylprednisolone / Q000494:pharmacology*; D013601:T-Lymphocytes / Q000187:drug effects* / Q000276:immunology; D006377:T-Lymphocytes, Helper-Inducer / Q000187:drug effects* / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface; D003524:Cyclosporins; D003208:Concanavalin A; D008775:Methylprednisolone