© 1997 American Heart Association, Inc.
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Effect of Natriuretic Peptide Family on the Oxidized LDL–Induced Migration of Human Coronary Artery Smooth Muscle Cells
From the First Department of Internal Medicine (M.K., K. Yokokawa, K. Yasunari, H.K., M.M., J.Y.) and the First Department of Pathology (M.U.), Osaka (Japan) City University Medical School.
Correspondence to Masakazu Kohno, MD, First Department of Internal Medicine, Osaka City University Medical School, 1-5-7 Asahi-machi, Abeno-ku, Osaka 545, Japan.
Abstract The migration of medial smooth muscle cells (SMCs) into the intima is proposed to be an important process of intimal thickening in atherosclerotic lesions. The present study examined the possible effect of a novel endothelium-derived relaxing peptide, C-type natriuretic peptide (CNP), on oxidized low-density lipoprotein (LDL)–induced migration of cultured human coronary artery SMCs by the Boyden's chamber method. The effect of CNP was compared with that of atrial and brain natriuretic peptides (ANP and BNP, respectively). Oxidized LDL stimulates SMC migration in a concentration-dependent manner between 20 and 200 µg/mL. This stimulation was chemotactic in nature but was not chemokinetic. By contrast, native LDL was without significant activity. CNP-22 clearly inhibited SMC migration stimulated with 200 µg/mL oxidized LDL in a concentration-dependent manner between 10-9 and 10-6 mol/L. ANP-(1-28) and BNP-32 also inhibited oxidized LDL–induced SMC migration at concentrations of 10-7 and 10-6 mol/L, but these effects were weaker than the effect of CNP-22. Such inhibition by these natriuretic peptides was paralleled by an increase in the cellular level of cGMP. Oxidized LDL–induced migration was significantly inhibited by a stable analogue of cGMP, 8-bromo-cGMP, or an activator of the cytosolic guanylate cyclase, sodium nitroprusside. These natriuretic peptides did not suppress the cell adhesion either in the absence or presence of oxidized LDL. These data indicate that oxidized LDL stimulates migration of human coronary artery SMCs and that natriuretic peptides, especially CNP, inhibit this stimulated SMC migration, at least in part, through a cGMP-dependent process. Taken together with the finding that oxidized LDL is present in the intima, CNP may play a role as a local antimigration factor during the process of intimal thickening in hypercholesterolemia-induced coronary atherosclerosis.
Key Words: natriuretic peptide • oxidized low-density lipoprotein • migration • smooth muscle cell • human coronary artery
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