doi: 10.1161/hq0701.092143
© 2001 American Heart Association, Inc.
Vascular Biology |
HMG-CoA Reductase Inhibitor Modulates Monocyte–Endothelial Cell Interaction Under Physiological Flow Conditions In Vitro
Involvement of Rho GTPase–Dependent Mechanism
Presented in part at the 72nd Scientific Sessions of the American Heart Association, Atlanta, Ga, November 7–10, 1999, and published in abstract form (Circulation. 1999;100[suppl I]:I-693).
From the Department of Applied Genetics (M.Y., T.S., H.I., Y.Y.) and Department of Medicine (T.S., H.I.., F.N.), Tokyo Medical and Dental University; and the Cardiovascular Research Center, Massachusetts General Hospital (R.E.G., A.R.), and Vascular Research Division, Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School (M.A.G.), Boston, Mass.
Correspondence to Masayuki Yoshida, MD, Department of Applied Genetics, Tokyo Medical and Dental University, 1-5-45, Yushima Bldg D-621, Bunkyo-ku, Tokyo 113-8510, Japan. E-mail masamgen{at}tmd.ac.jp
Abstract—3-Hydroxy-3-methylglutaryl coenzyme A reductase inhibitors, or statins, have been reported to exert actions independent of their lipid-lowering effects. To critically assess the effects of statins on monocyte–endothelial cell interactions, we used an in vitro model that mimicked physiological flow conditions. Monocytic U937 cells were incubated in the presence of cerivastatin for 48 hours. Adhesive interactions of statin-treated U937 cells were then analyzed by use of activated (interleukin-1ß 10 U/mL, 4 hours) human umbilical vein endothelial cells in an in vitro flow apparatus. Flow cytometric analysis of adhesion molecules and measurement of F-actin content in U937 cells were performed before and after statin treatment. Preincubation with cerivastatin significantly decreased U937 firm adhesion to activated human umbilical vein endothelial cells, whereas U937 rolling was not decreased. Fluorescence-activated cell sorter analysis revealed downregulation of U937 surface expression of CD11a, CD18, and VLA4 after statin treatment. Cerivastatin significantly reduced F-actin content in U937 cells and inhibited RhoA translocation, whereas preincubation with C3 exoenzyme reduced U937 adhesion under flow. Cerivastatin reduces monocyte adhesion to vascular endothelium under physiological flow conditions via downregulation of integrin adhesion molecules and inhibition of actin polymerization via RhoA inactivation. Our findings have important implications for the lipid-independent effects of statins.
Key Words: HMG-CoA reductase inhibitor • adhesion molecules • monocytes • atherosclerosis
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Arterioscler. Thromb. Vasc. Biol. 2001 21: 1256-1258.
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