title: Identification by monoclonal antibodies of T-cell subpopulations activated by 12-O-tetradecanoylphorbol-13-acetate (TPA).
abstract: Two major T-cell subpopulations obtained from human peripheral blood were studied their capacity to be activated by the tumor promoting agent, 12-O-tetradecanoylphorbol-13-acetate (TPA). The subpopulations were identified and separated from each other by their reactivity either to the monoclonal antibody, OKT4 or OKT8, followed by complement-dependent lysis. The fraction enriched in T8+ cells showed approximately a 1.2-2.0-fold greater proliferative response to TPA (20 ng/ml) than did the T4+ cell subset. Optimal activation required the presence of monocytes. Comparison of the mitotic activity showed that the sum of each T-cell subset was less than a mixture of the two. This indicates either a unilateral or cooperative interaction of mitogenesis in the presence of TPA.
mesh_terms: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D002469:Cell Separation; D003165:Complement System Proteins; D006801:Humans; D066298:In Vitro Techniques; D008213:Lymphocyte Activation; D010704:Phorbols / Q000494:pharmacology*; D011961:Receptors, Fc; D013601:T-Lymphocytes / Q000276:immunology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*
chemical_list: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D010704:Phorbols; D011961:Receptors, Fc; D003165:Complement System Proteins; D013755:Tetradecanoylphorbol Acetate