title: B cell activation. IV. Induction of cell membrane depolarization and hyper-I-A expression by phorbol diesters suggests a role for protein kinase C in murine B lymphocyte activation.
abstract: Analysis of the effects of phorbol diesters on mouse B lymphocyte kinase C activity, membrane potential, mI-A expression, and cell cycle state are reported. Results indicate that the phorbol diesters PMA and 4 beta-PDD, which are potent tumor promoters, activate partially purified B cell protein kinase C and stimulate B cell membrane depolarization and increased mI-A expression. The analog 4 alpha-PDD has none of these effects. Similarly, none of the phorbol diesters tested promoted G0 to G1 transition of B lymphocytes. Results are consistent with the possibility that the transmembrane signal transduction mediated by cell membrane immunoglobulin, which results in membrane depolarization and increased I-A antigen expression, operates via activation of protein kinase C.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology / Q000201:enzymology / Q000276:immunology*; D002453:Cell Cycle / Q000187:drug effects; D004789:Enzyme Activation / Q000187:drug effects; D000949:Histocompatibility Antigens Class II / Q000032:analysis*; D008213:Lymphocyte Activation / Q000187:drug effects*; D008564:Membrane Potentials / Q000187:drug effects; D051379:Mice; D008807:Mice, Inbred BALB C; D010703:Phorbol Esters / Q000494:pharmacology*; D010704:Phorbols / Q000494:pharmacology*; D011493:Protein Kinase C; D011494:Protein Kinases / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D000949:Histocompatibility Antigens Class II; D010703:Phorbol Esters; D010704:Phorbols; C008876:phorbol-12,13-didecanoate; D011494:Protein Kinases; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate