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Reversible inhibition of vasoconstriction by thiazolidinediones related to PI3K/Akt inhibition in vascular smooth muscle cells.

Abstract：

:Thiazolidinediones (also referred to as glitazones), agonists for Peroxisome Proliferator-Activated Receptor gamma (PPARγ), are used for treating type 2 diabetes mellitus, where they decrease insulin resistance and cardiovascular risk. Compounds bearing the thiazolidinedione structure have also been shown to inhibit phosphoinositide 3-kinase (PI3K). Here we tried to elucidate the poorly defined role of PI3K/Akt in the physiology of vascular smooth muscle cell contraction and tested the hypothesis that thiazolidinediones, by affecting the PI3K/Akt pathway, may influence vascular physiology. Isolated rat femoral arteries segments were mounted in a wire myograph and challenged with 100mM KCl or phenylephrine (PE), in the absence or presence of troglitazone, rosiglitazone, pioglitazone, LY294002 (PI3K inhibitor) and 10-DEBC (Akt inhibitor). All these compounds dose-dependently inhibited vasoconstriction to KCl or PE; their effect was reversible (after 60-120 min washout) and not affected by GW9662 (a PPARγ antagonist) or by N(G)-nitro-L-arginine (LNNA, an inhibitor of NO biosynthesis). Analysis of phospho-Akt (ser 473) in lysates from rat arteries (by immunoblot) revealed that thiazolidinediones, LY294002 and 10-DEBC, at the same concentration and kinetics inhibiting vasoconstriction, produced a similar decrease of Akt phosphorylation. PI3K/Akt pathway therefore appears to be an important, fast acting, modulator of contraction of vascular smooth muscle. Thiazolidinediones decrease vasoconstriction of isolated vessels possibly by inhibiting PI3K/Akt pathway. Such an effect of glitazones, if occurring in vivo, may impact cardiovascular syndromes related to vasospasm in diabetic patients.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Sinagra T,Tamburella A,Urso V,Siarkos I,Drago F,Bucolo C,Salomone S

doi

10.1016/j.bcp.2012.11.013

subject

Has Abstract

pub_date

2013-02-15 00:00:00

pages

551-9

issue

4

eissn

0006-2952

issn

1873-2968

pii

S0006-2952(12)00754-X

journal_volume

85

pub_type

杂志文章

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