Lack of involvement of extracellular signal-regulated kinase (ERK) in the agonist-induced endothelial nitric oxide synthesis

Biochemical Pharmacology
Kurt SchmidtBernd Mayer

Abstract

In a recent paper, it was shown that stimulation of endothelial cells with bradykinin (BK) leads to phosphorylation of endothelial nitric oxide synthase (eNOS) mediated by extracellular signal-regulated kinase (ERK) (J. Biol. Chem. 275 (2000) 30707). Since in vitro phosphorylation by ERK reduced the catalytic activity of eNOS, it was suggested that this mechanism may be an important determinant of nitric oxide signalling in endothelial cells. To explore the physiological role of ERK as regulator of nitric oxide synthesis in intact cells, we measured the effects of the kinase inhibitor PD 98059 on BK- and ATP-induced nitric oxide formation in cultured endothelial cells and isolated vascular smooth muscle strips. PD 98059 completely inhibited ERK activation by BK and ATP in porcine aortic endothelial cells without affecting eNOS activation. Moreover, PD 98059 did not potentiate relaxation of isolated porcine pulmonary arteries to BK or ATP, indicating that ERK-catalysed eNOS phosphorylation does not contribute to the regulation of nitric oxide formation in intact cells or tissues.

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Citations

Nov 6, 2010·Arteriosclerosis, Thrombosis, and Vascular Biology·Ling RuanRichard C Venema
Oct 20, 2010·International Journal of Molecular Sciences·Han-Mei XuZilong Shen
Aug 20, 2008·Fertility and Sterility·Omid Khorram, Guang Han
May 23, 2006·British Journal of Pharmacology·Karina KrotovaSergey Zharikov
Sep 17, 2005·Kidney International·Denis FeliersBalakuntalam S Kasinath
Nov 15, 2003·Circulation Research·T R UhrenholtO Skøtt
Dec 17, 2002·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Ingrid Fleming, Rudi Busse

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