Simvastatin releases Ca2+ from a thapsigargin-sensitive pool and inhibits InsP3-dependent Ca2+ mobilization in vascular smooth muscle cells.

Abstract:

:Simvastatin (SV), an inhibitor of 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase activity inhibits migration and proliferation of vascular smooth muscle cells (SMC). To investigate whether these effects of SV are related to inhibition of cell calcium mobilization, cultured SMC obtained from rat aorta were loaded with Fura-2 to determine the basal cytosolic free calcium levels ([Ca2+]i) and the agonist-stimulated Ca2+ mobilization. SV (20 mu M) transiently increased cytosolic free calcium, an effect that depends mainly on intracellular calcium release (68%). This effect of SV was markedly reduced (75%) by thapsigargin, an inhibitor of the Ca2+ ATPase of inositol 1,4,5-triphosphate (InsP3)-sensitive calcium pools. Incubation of cells with SV (15 min) inhibited the mobilization of Ca2+ by angiotensin II, platelet-derived growth factor, and vasopressin (IC50 = 5 mu M). SV did not affect inositol trisphosphate (InsP3) levels or modify its generation by angiotensin II (Ang II) and vasopressin. Furthermore, in saponin-permeabilized cells, SV abolished the release of calcium by 2,3-dideoxy-InsP3. SV reduced the effect of thapsigargin on InsP3-sensitive stores by 67%, suggesting that SV depletes these calcium pools. The inhibitory effect of SV on calcium mobilization was prevented by coincubation of cultured cells (24 h) with 1 mM mevalonic acid, the product of HMG-CoA reductase activity. These results support the notion that SV inhibits [corrected] the migration and proliferation of SMC by directly affecting cell Ca2+.

journal_name

J Cardiovasc Pharmacol

authors

Escobales N,Castro M,Altieri PI,Sanabria P

doi

10.1097/00005344-199603000-00011

subject

Has Abstract

pub_date

1996-03-01 00:00:00

pages

383-91

issue

3

eissn

0160-2446

issn

1533-4023

journal_volume

27

pub_type

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