title: Protein kinase C modulates actin conformation in human T lymphocytes.
abstract: We studied the effect of activators and inhibitors of protein kinase C on actin conformation in human blood lymphocytes by flow cytometry and gel electrophoresis. PMA, 1-oleyl-2-acetyl-glycerol, and mezerein, activators of protein kinase C, caused an increase in lymphocyte F-actin within 2 to 5 min. After stimulation with PMA, lymphocytes formed pseudopods containing an increased concentration of F-actin and had an increase of actin in the Triton-insoluble cytoskeletal fraction. Sphingosine and H-7, inhibitors of protein kinase C activation, inhibited the increase in F-actin induced by PMA. The increase in F-actin in response to PMA was striking in Th and Ts lymphocytes (2- to 3-fold increase), but B lymphocytes had only a slight increase (1.15-fold). Thus, activation of protein kinase C modulates actin conformation specifically in T lymphocytes.
authors.affiliation: Department of Medicine, University of Rochester School of Medicine and Dentistry, NY 14642.
authors.forename: P D
authors.initials: PD
authors.lastname: Phatak
authors.forename: C H
authors.initials: CH
authors.lastname: Packman
authors.forename: M A
authors.initials: MA
authors.lastname: Lichtman
mesh_terms: D000199:Actins / Q000378:metabolism*; D004789:Enzyme Activation / Q000187:drug effects; D006801:Humans; D011487:Protein Conformation / Q000187:drug effects; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000502:physiology*; D013110:Sphingosine / Q000494:pharmacology; D013601:T-Lymphocytes / Q000145:classification / Q000187:drug effects / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D000199:Actins; D011493:Protein Kinase C; D013110:Sphingosine; D013755:Tetradecanoylphorbol Acetate