Immediate and Delayed VEGF-mediated NO Synthesis in Endothelial Cells: Role of PI3K, PKC and PLC Pathways

Overview

Journal Br J Pharmacol

Publisher Wiley

Specialty Pharmacology

Date 2002 Nov 14

PMID 12429574

Citations 45

Authors

David S Gelinas

Pascal N Bernatchez

Simon Rollin

Nicolas G Bazan

Martin G Sirois

Affiliations

Soon will be listed here.

Abstract

1. The mechanism(s) by which vascular endothelial growth factor (VEGF) induces endothelial nitric oxide synthase (eNOS) activation remain(s) unclear up to a certain extent. Therefore, we sought to evaluate the contribution of numerous pathways in VEGF-induced nitric oxide (NO) synthesis by measuring cGMP production. In addition, as VEGF induces the synthesis of NO and platelet-activating factor (PAF), we wanted to assess if the induction of PAF and NO is contributing to the synthesis of each other. 2. Herein, we show that a treatment of endothelial cells with a phospholipase C (PLC) inhibitor (U73122), a calmodulin antagonist (W-7) or with intracellular calcium chelators (EGTA/AM, BAPTA/AM) prevented VEGF-mediated eNOS Ser(1177)-phosphorylation and NO synthesis measured by cGMP production. 3. Pretreatment with phosphatidylinositol 3-kinase (PI3K) (Wortmannin, LY294002) or protein kinase C (PKC) (GF109203X, Ro318220) inhibitors attenuated eNOS Ser(1177)-phosphorylation mediated by VEGF, but did not alter immediate (0-10 min) cGMP synthesis induced by VEGF, but abrogated by up to 84% the delayed (10-30 min) cGMP synthesis. 4. Pretreatment with PAF synthesis inhibitors or with PAF receptor antagonists did not abrogate neither eNOS Ser(1177)-phosphorylation nor cGMP synthesis mediated by VEGF. 5. In conclusion, VEGF induces an immediate cGMP synthesis through the PLC-Ca2+/CaM pathway, and that the induction of delayed cGMP synthesis implies Akt and PKC activity.

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