doi: 10.1161/hq1001.096652
© 2001 American Heart Association, Inc.
Atherosclerosis and Lipoproteins |
Expression of SR-PSOX, a Novel Cell-Surface Scavenger Receptor for Phosphatidylserine and Oxidized LDL in Human Atherosclerotic Lesions
From the Departments of Geriatric Medicine (M.M., N.K., K.H., T.K.), Neurosurgery (H.K.), and Cardiovascular Surgery (M.H., M.K.), Graduate School of Medicine, Kyoto University, and Institute for Virus Research (T.S., S.Y.), Kyoto University, Kyoto, Japan; the Department of Neurosurgery (Y.A., I.N.), National Cardiovascular Center, Suita, Japan; and the Department of Cardiology (K.A., M.N.), Kokura Memorial Hospital, Kitakyushu, Japan.
Correspondence to Noriaki Kume, MD, PhD, Department of Geriatric Medicine, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan. E-mail nkume{at}kuhp.kyoto-u.ac.jp
Abstract—— Receptor-mediated endocytosis of oxidized low density lipoprotein (Ox-LDL) by macrophages and the subsequent foam cell transformation in the arterial intima are key events in early atherogenesis. Recently, we have identified a novel macrophage cell-surface receptor for Ox-LDL by expression cloning from a cDNA library of phorbol 12-myristate 13-acetate–stimulated THP-1 cells, designated as the scavenger receptor for phosphatidylserine and oxidized lipoprotein (SR-PSOX). Here, we examined SR-PSOX expression in human atherosclerotic lesions. Total cellular RNA and fresh frozen sections were prepared from human carotid endarterectomy specimens (from 21 patients) and directional coronary atherectomy specimens (from 11 patients). Fragments of human aortas of 2 patients without visible atherosclerotic lesions served as negative controls. Quantitative reverse transcription–polymerase chain reaction demonstrated that SR-PSOX mRNA expression was prominent in atherosclerotic lesions but undetectable in normal aortas. Immunohistochemistry showed that SR-PSOX was predominantly expressed by lipid-laden macrophages in the intima of atherosclerotic plaques in carotid endarterectomy and directional coronary atherectomy specimens, although its expression was not detectable in normal arterial wall. Double-labeled immunohistochemistry confirmed that SR-PSOX is expressed by intimal macrophages. Taken together, SR-PSOX may be involved in Ox-LDL uptake and subsequent foam cell transformation in macrophages in vivo and thus may play important roles in human atherosclerotic lesion formation.
Key Words: atherosclerosis • immunohistochemistry • lipoproteins • macrophages • receptors
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