title: Phenylarsine oxide and H2O2 plus vanadate induce reverse translocation of phorbol-ester-activated PKCbetaII.
abstract: The intracellular localization of protein kinase C (PKC) is important for the regulation of its biological activity. Recently, it was reported that, whereas phorbol esters such as PMA induce prolonged translocation of PKC to the plasma membrane, with physiological stimuli, the translocation of PKC is transient and followed by rapid return to the cytoplasm. In addition, this membrane dissociation of PKC was shown to require both the kinase activity of PKC and the phosphorylation of its carboxyl terminus autophosphorylation sites. However, the detailed molecular mechanism of PKC reverse translocation remains obscure. We demonstrated that in porcine polymorphonuclear leucocytes (PMNs), phenylarsine oxide (PAO), a putative protein tyrosine phosphatase (PTPase) inhibitor, induced reverse translocation of PMA-stimulated PKCbetaII. Hydrogen peroxide (H(2)O(2)) in combination with vanadate, both of which are PTPase inhibitors, also induced reverse translocation of PKCbetaII. H(2)O(2) or vanadate alone had little effect on PMA-induced PKCbetaII translocation. Furthermore, genistein and ethanol, which are inhibitors of tyrosine kinase and phospholipase D, respectively, prevented the PKCbetaII reverse translocation induced by the PTPase inhibitors. These results indicate, for the first time, that the tyrosine phosphorylation/phospholipase D pathway may be involved in the process of membrane dissociation of PKC.
authors.affiliation: Department of Biology, School of Education, Waseda University, Tokyo 169-0051, Japan.
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Takahashi
authors.forename: Kingo
authors.initials: K
authors.lastname: Suzuki
authors.forename: Hideo
authors.initials: H
authors.lastname: Namiki
mesh_terms: D000818:Animals; D001152:Arsenicals / Q000494:pharmacology*; D002462:Cell Membrane / Q000187:drug effects / Q000201:enzymology; D002478:Cells, Cultured; D003593:Cytoplasm / Q000187:drug effects / Q000201:enzymology; D004789:Enzyme Activation / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000494:pharmacology; D000431:Ethanol / Q000494:pharmacology; D019833:Genistein / Q000494:pharmacology; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D009504:Neutrophils / Q000187:drug effects / Q000201:enzymology; D010739:Phospholipase D / Q000378:metabolism; D010766:Phosphorylation / Q000187:drug effects; D011493:Protein Kinase C / Q000187:drug effects / Q000378:metabolism*; D064546:Protein Kinase C beta; D021381:Protein Transport / Q000187:drug effects / Q000502:physiology; D017027:Protein Tyrosine Phosphatases / Q000037:antagonists & inhibitors / Q000378:metabolism; D034421:Sus scrofa; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D014638:Vanadates / Q000494:pharmacology*
chemical_list: D001152:Arsenicals; D004791:Enzyme Inhibitors; C029341:oxophenylarsine; D000431:Ethanol; D014638:Vanadates; D006861:Hydrogen Peroxide; D019833:Genistein; D011493:Protein Kinase C; D064546:Protein Kinase C beta; D017027:Protein Tyrosine Phosphatases; D010739:Phospholipase D; D013755:Tetradecanoylphorbol Acetate