Role of Atrial Natriuretic Peptide in the Suppression of Lysophosphatydic Acid-induced Rat Aortic Smooth Muscle (RASM) Cell Growth

Overview

Journal Mol Cell Biochem

Publisher Springer

Specialty Biochemistry

Date 2005 Jul 14

PMID 16010968

Citations 8

Authors

P M Baldini

P De Vito

F DAquilio

D Vismara

F Zalfa

C Bagni

R Fiaccavento

P Di Nardo

Affiliations

Soon will be listed here.

Abstract

Lysophosphatidic acid (LPA) is a lipid mediator with multiple biological functions. In the present study we investigated the possible role of atrial natriuretic peptide (ANP), a hormone affecting cardiovascular homeostasis and inducing antimitogenic effects in different cell types, on LPA-induced cell growth and reactive oxygen species (ROS) production in rat aortic smooth muscle (RASM) cells. Both LPA effects on cell growth and levels of ROS were totally abrogated by physiological concentrations of ANP, without modifying the overexpression of LPA-receptors. These effects were also affected by cell pretreatment with wortmannin, an inhibitor of phosphatidylinositol 3-kinase (PI3K). Moreover, the LPA-induced activation of Akt, a downstream target of PI3K, was completely inhibited by physiological concentrations of ANP, which were also able to inhibit p42/p44 phosphorylation. Taken together, our data suggest that PI3K may represent an important step in the LPA signal transduction pathway responsible for ROS generation and DNA synthesis in RASM cells. At same time, the enzyme could also represent an essential target for the antiproliferative effects of ANP.

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