(Circulation. 2000;101:2889.)
© 2000 American Heart Association, Inc.
Clinical Investigation and Reports |
From the Departments of Medicine and Physiology, University of Florida and VA Medical Center, Gainesville, Fla.
Correspondence to J.L. Mehta, MD, PhD, 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
BackgroundWe have recently demonstrated a lectin-like receptor for oxidized (ox)-LDL (LOX-1) in human coronary artery endothelial cells (HCAECs). This receptor is upregulated by ox-LDL. The present study examined the significance of LOX-1 in monocyte adhesion to HCAECs and endothelial injury in response to ox-LDL.
Methods and ResultsHCAECs were incubated in the presence of antisense oligodeoxynucleotides to the 5'-coding sequence of the human LOX-1 gene (0.5 µm/L). Basal LOX-1 mRNA and protein were suppressed by antisense LOX-1. Ox-LDLmediated upregulation of LOX-1 was also suppressed by antisense LOX-1. Incubation of HCAECs with ox-LDL (40 µg/mL) for 24 hours markedly increased monocyte chemoattractant protein-1 (MCP-1) mRNA and protein expression as well as monocyte adhesion to HCAECs (P<0.01). After 48 hours of preincubation of HCAECs with antisense LOX-1, ox-LDLmediated upregulation of MCP-1 and monocyte adhesion to HCAECs both were suppressed (P<0.01), whereas sense LOX-1 had no effect. Whereas antisense or sense LOX-1 alone (both 0.5 nmol/L) did not injure the cells, antisense LOX-1, but not sense LOX-1, reduced ox-LDLmediated HCAEC injury, determined as LDH release (P<0.01). Activation of mitogen-activated protein kinase (MAPK) may play a critical role in signal transduction in ox-LDLmediated alteration in MCP-1 expression, since antisense LOX-1, but not the sense LOX-1, completely inhibited the ox-LDLinduced MAPK activation.
ConclusionsThese observations with the first use of a specific antisense to human LOX-1 mRNA suggest that LOX-1 is a key factor in ox-LDLmediated monocyte adhesion to HCAECs.
Key Words: endothelium receptors lipoproteins cell adhesion molecules gene therapy
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