Abstract：
:We investigated the involvement of p160ROCK (a Rho-associated coiled coil-forming protein kinase), one of Rho kinases on superoxide anion production (O(2)(-) production), aggregation and adhesion of human polymorphonuclear leukocytes under physiological condition, using a selective p160ROCK inhibitor, (+)-(R)-trans-4-(1-aminoethyl)-N-(4-pyridyl)cyclohexanecarboxamide (Y-27632). Y-27632 inhibited the O(2)(-) production stimulated by phorbol-12-myristate-13-acetate (PMA) in a dose-dependent manner. Stauroprorine blocked the PMA-induced O(2)(-) production while wortmannin did not. Y-27632 also inhibited the O(2)(-) production by guanosine 5'-O-(3-thiotriphosphate) (GTP(gamma)S) 100 microM. N-formyl-Met-Leu-Phe (fMLP)-induced O(2)(-) production was not influenced by Y-27632, but was inhibited by wortmannin. The enhanced O(2)(-) production by Ca-ionophore A23817 and thapsigargin was not inhibited by Y-27632. Y-27632 did not change the basal intracellular Ca(2+) concentration nor its elevation stimulated by fMLP. Polymorphonuclear leukocytes aggregation induced by PMA was dose-dependently decreased by Y-27632 while their aggregation stimulated by fMLP was enhanced by the agent. Polymorphonuclear leukocytes adhesion induced by PMA or fMLP was not influenced by Y-27632.These results suggest that p160ROCK is involved in the PMA-induced O(2)(-) production and aggregation in human polymorphonuclear leukocytes. This kinase might locate in downstream of protein kinase C in polymorphonuclear leukocytes.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Kawaguchi A,Ohmori M,Harada K,Tsuruoka S,Sugimoto K,Fujimura Adoi
10.1016/s0014-2999(00)00593-8keywords:
subject
Has Abstractpub_date
2000-09-08 00:00:00pages
203-8issue
3eissn
0014-2999issn
1879-0712pii
S0014299900005938journal_volume
403pub_type
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