Impact of salusin-alpha and -beta on human macrophage foam cell formation and coronary atherosclerosis

Circulation
Takuya WatanabeAkira Miyazaki

Abstract

Human salusins, related bioactive polypeptides with mitogenic effects on vascular smooth muscle cells and fibroblasts and roles in hemodynamic homeostasis, may be involved in the origin of coronary atherosclerosis. Macrophage foam cell formation, characterized by cholesterol ester accumulation, is modulated by scavenger receptor (cholesterol influx), acyl-coenzyme A:cholesterol acyltransferase-1 (ACAT-1; storage cholesterol ester converted from free cholesterol), and ATP-binding cassette transporter A1 (cholesterol efflux). Serum salusin-alpha levels were decreased in 173 patients with angiographically proven coronary artery disease compared with 40 patients with mild hypertension and 55 healthy volunteers (4.9+/-0.6 versus 15.4+/-1.1 and 20.7+/-1.5 pmol/L, respectively; P<0.0001). Immunoreactive salusin-alpha and -beta were detected in human coronary atherosclerotic plaques, with dominance of salusin-beta in vascular smooth muscle cells and fibroblasts. After 7 days in primary culture, acetylated low-density lipoprotein-induced cholesterol ester accumulation in human monocyte-derived macrophages was significantly decreased by salusin-alpha and increased by salusin-beta. Salusin-alpha significantly reduced ACAT-1 expression in ...Continue Reading

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Citations

Oct 31, 2008·Hypertension Research : Official Journal of the Japanese Society of Hypertension·Tomoko KanomeAkira Miyazaki
May 24, 2008·Hypertension Research : Official Journal of the Japanese Society of Hypertension·Takuya WatanabeAkira Miyazaki
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