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A role of protein kinase C in the regulation of cytosolic phospholipase A(2) in bradykinin-induced PGI(2) synthesis by human vascular endothelial cells.

Abstract：

:The purpose of this study was to elucidate the mechanism by which bradykinin (BK) enhances prostacyclin (PGI(2)) production in human umbilical vein endothelial cells (HUVEC). BK-induced enhancement of PGI(2) synthesis was observed in a dose- and time-dependent manner, and it also increased [Ca(2+)](i) followed by enhancement of cytosolic phospholipase A(2) (cPLA(2)) activity. The PKC inhibitors GF109203X and H7 attenuated the BK-induced increase in [Ca(2+)](i) and inhibited the BK-induced PGI(2) synthesis. Phorbol 12-myristate 13-acetate increased cPLA(2) activity and PGI(2) synthesis but failed to alter [Ca(2+)](i). BK increased cPLA(2) mRNA eightfold by 15 min, and this increase was inhibited by pretreatment with the PKC inhibitors. In response to cycloheximide pretreatment, cPLA(2) mRNA was superinduced. These results suggest that BK stimulates PGI(2) synthesis in HUVEC by activation of cPLA(2) by dual mechanisms: an elevation of [Ca(2+)](i) and a PKC-dependent pathway. Moreover, changes in calcium kinetics and expression of cPLA(2) mRNA may underlie the BK-induced PGI(2) enhancement in these cells.

journal_name

Microvasc Res

journal_title

Microvascular research

authors

Higaki T,Sawada S,Kono Y,Imamura H,Tada Y,Yamasaki S,Toratani A,Sato T,Komatsu S,Akamatsu N,Tamagaki T,Tsuda Y,Tsuji H,Nakagawa M

doi

10.1006/mvre.1999.2163

keywords:

subject

Has Abstract

pub_date

1999-09-01 00:00:00

pages

144-55

issue

2

eissn

0026-2862

issn

1095-9319

pii

S0026-2862(99)92163-5

journal_volume

58

pub_type

杂志文章

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