HMG-CoA reductase inhibitors decrease CD11b expression and CD11b-dependent adhesion of monocytes to endothelium and reduce increased adhesiveness of monocytes isolated from patients with hypercholesterolemia
C Weber,
W Erl,
KS Weber,
and
PC Weber
Institut fur Prophylaxe der Kreislaufkrankheiten, Ludwig-Maximilians-Universitat, Munich, Germany.
OBJECTIVES: This study sought to determine whether inhibitors of 3-hydroxy-3-methyl-glutaryl coenzyme A (HMG-CoA) reductase affect CD11b expression and adhesiveness of monocytes in vitro and after treatment of patients with hypercholesterolemia. BACKGROUND: HMG-CoA reductase inhibitors improve survival of patients with coronary heart disease (CHD) and prevent CHD in hypercholesterolemic men. Because these drugs have been shown to modulate monocyte functions, they may act by reducing monocyte adhesion to endothelium, which is crucial in atherogenesis. METHODS: Isolated human blood monocytes were subjected to flow cytometric detection of CD11b and adhesion assays on fixed human endothelial cells after treatment with lovastatin in vitro or ex vivo before and after treatment of hypercholesterolemic patients with HMG-CoA reductase inhibitors. RESULTS: The integrin heterodimer CD11b/CD18 expressed on monocytes interacts with intercellular adhesion molecule-1 on endothelium and is involved in monocyte adhesion to endothelium. Treatment of monocytes with lovastatin in vitro slightly and dose dependently reduced surface expression of CD11b on monocytes. Moreover, lovastatin inhibited CD11b-dependent adhesiveness to fixed endothelium of unstimulated monocytes or monocytes stimulated with monocyte chemotactic protein 1. Coincubation with mevalonate, but not with low density lipoprotein (LDL), reversed the effects of lovastatin, suggesting that early cholesterol precursors, but not cholesterol, are crucial for adhesiveness of CD11b. In hypercholesterolemic patients, adhesion of isolated monocytes to endothelium ex vivo was dramatically increased over values in healthy control subjects. Treatment of these patients with the HMG-CoA reductase inhibitors lovastatin or simvastatin (20 to 40 mg/day) for 6 weeks slightly decreased total and LDL cholesterol plasma levels and monocyte CD11b surface expression but resulted in a significant reduction of monocyte adhesion to endothelium (p < 0.01, n = 7). CONCLUSIONS: The reduction of CD11b expression and inhibition of CD11b-dependent monocyte adhesion to endothelium may crucially contribute to the clinical benefit of HMG-CoA reductase inhibitors in CHD, independent of cholesterol-lowering effects.
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Expression of the monocyte chemoattractant protein-1 receptor CCR2 is increased in hypercholesterolemia: differential effects of plasma lipoproteins on monocyte function
J. Lipid Res.,
June 1, 1999;
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[Abstract]
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N. Hrboticky, G. Draude, G. Hapfelmeier, R. Lorenz, and P. C. Weber
Lovastatin Decreases the Receptor-Mediated Degradation of Acetylated and Oxidized LDLs in Human Blood Monocytes During the Early Stage of Differentiation Into Macrophages
Arterioscler Thromb Vasc Biol,
May 1, 1999;
19(5):
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[Abstract]
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A. Szczeklik, J. Musial, A. Undas, P. Gajewski, P. Gora, J. Swadzba, and M. Jankowski
Inhibition of thrombin generation by simvastatin and lack of additive effects of aspirin in patients with marked hypercholesterolemia
J. Am. Coll. Cardiol.,
April 1, 1999;
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[Abstract]
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[PDF]
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K. H. Han, R. K. Tangirala, S. R. Green, and O. Quehenberger
Chemokine Receptor CCR2 Expression and Monocyte Chemoattractant Protein-1–Mediated Chemotaxis in Human Monocytes : A Regulatory Role for Plasma LDL
Arterioscler Thromb Vasc Biol,
December 1, 1998;
18(12):
1983 - 1991.
[Abstract]
[Full Text]
[PDF]
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R. S. Rosenson and C. C. Tangney
Antiatherothrombotic Properties of Statins: Implications for Cardiovascular Event Reduction
JAMA,
May 27, 1998;
279(20):
1643 - 1650.
[Abstract]
[Full Text]
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R. Baetta, M. Camera, C. Comparato, C. Altana, M. D. Ezekowitz, and E. Tremoli
Fluvastatin Reduces Tissue Factor Expression and Macrophage Accumulation in Carotid Lesions of Cholesterol-Fed Rabbits in the Absence of Lipid Lowering
Arterioscler Thromb Vasc Biol,
April 1, 2002;
22(4):
692 - 698.
[Abstract]
[Full Text]
[PDF]
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K. K. Koh, W. H. Schenke, M. A. Waclawiw, G. Csako, and R. O. Cannon III
Statin Attenuates Increase in C-Reactive Protein During Estrogen Replacement Therapy in Postmenopausal Women
Circulation,
April 2, 2002;
105(13):
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[Abstract]
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