© 1999 American Heart Association, Inc.
Original Contributions |
Upregulation of Endothelial Receptor for Oxidized Low-Density Lipoprotein (LOX-1) in Cultured Human Coronary Artery Endothelial Cells by Angiotensin II Type 1 Receptor Activation
From the Departments of Medicine (D.Y.L, J.L.M.) and Physiology (Y.C.Z., M.I.P., J.L.M.), University of Florida and Veterans Affairs Medical Center, Gainesville, Fla; Department of Bioscience (T.S.), National Cardiovascular Center Research Institute, Osaka, Japan; and Department of Molecular Pathophysiology (T.S.), Graduate School of Pharmaceutical Sciences, Osaka University, Japan.
Correspondence to J.L. Mehta, Department of Medicine, University of Florida College of Medicine, 1600 Archer Rd, PO Box 100277 JHMHC, Gainesville, FL 32610. E-mail mehta{at}medmac.ufl.edu
Abstract—Cross talk between oxidized LDL (ox-LDL) and angiotensin II (Ang II) may be relevant in atherosclerosis. In this study, we examined the presence of a specific endothelial receptor for ox-LDL (LOX-1) and Ang II receptors in human coronary artery endothelial cells (HCAECs). In addition, we studied the effect of Ang II on LOX-1 gene and protein expression. LOX-1 was consistently identified in HCAECs by reverse transcriptase–polymerase chain reaction (RT-PCR), cDNA sequence, Western blot, and 125I-labeled ox-LDL binding assay (Bmax, 29.7 ng/mg protein). The HCAECs also exhibited Ang II receptors (AT1>AT2), as determined by RT-PCR and 125I-labeled Ang II binding assay (Bmax, 2.21 and 1.19 fmol/mg protein, respectively). Incubation of HCAECs with Ang II markedly increased LOX-1 mRNA (RT-PCR) and protein (Western blot) expression. The increase in LOX-1 expression was dependent on Ang II concentration (10–12 to 10–6 mol/L). Ang II caused a concentration-dependent increase in 125I-labeled ox-LDL uptake by HCAECs and enhanced ox-LDL–mediated cell injury, as evident from an increase in LDH release and a decrease in cell viability. These effects of Ang II were completely blocked by pretreatment of HCAECs with losartan, a specific AT1 blocker, but not by PD123319, a specific AT2 blocker. These observations indicate the following: (1) HCAECs possess abundant LOX-1 as well as Ang II (AT1>AT2) receptors, (2) Ang II upregulates LOX-1 receptor and ox-LDL uptake, (3) the effects of Ang II are mediated by AT1 activation, and (4) Ang II enhances ox-LDL–mediated injury to HCAECs.
Key Words: angiotensin II • endothelial cell • oxidized LDL • receptor
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