CCR5 deficiency is not protective in the early stages of atherogenesis in apoE knockout mice

Atherosclerosis
William A KuzielNobuyo Maeda

Abstract

The accumulation of macrophages and T lymphocytes in vessel walls is a hallmark of atherogenesis. It has recently been demonstrated in mouse models of atherosclerosis that full disease potential is dependent on several regulators of leukocyte trafficking, including the chemokine monocyte chemotactic protein 1 (MCP-1) and the chemokine receptors CCR2 and CXCR2. A possible role for the chemokine receptor CCR5 in atherogenesis has been suggested by CCR5 expression on macrophages, T cells, coronary endothelial cells and aortic smooth muscle cells and by the presence of CCR5 ligands in atherosclerotic plaques. Moreover, individuals who are naturally deficient in CCR5 were reported to be at reduced risk for severe coronary artery disease (CAD) and early myocardial infarction (MI). To investigate whether CCR5 is pro-atherogenic in mice, we generated CCR5-deficient mice and crossed them with atherosclerosis-prone apoE-deficient mice. Although CCR5-deficient mice exhibit defects in induced macrophage trafficking, mean atherosclerotic lesion area did not differ significantly between apoE-deficient mice and apoE/CCR5-deficient mice after 16 weeks on a diet of normal chow. Ribonuclease protection assays (RPA) on RNA isolated from plaques f...Continue Reading

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