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• W1829947658 abstract "Atherogenic processes and vascular remodelling after arterial injury are controlled and driven by a plethora of factors amongst which the activation of the complement system is pivotal. Recently, we reported a clear correlation between high expressions of the second receptor for complement anaphylatoxin C5a, the C5a receptor-like 2 (C5L2, C5aR2), with high pro-inflammatory cytokine expression in advanced human atherosclerotic plaques. This prompted us to speculate that C5aR2 might have a functional role in atherosclerosis. We, therefore, investigated the role of C5aR2 in atherosclerosis and vascular remodelling. Here, we demonstrate that C5ar2 deletion, in atherosclerosis-prone mice, attenuates atherosclerotic as well as neointimal plaque formation, reduces macrophages and CD3+ T cells and induces features of plaque stability, as analysed by histomorphometry and quantitative immunohistochemistry. As a possible underlying mechanism, C5ar2-deficient plaques showed significantly reduced expression of C5a receptor (C5ar1), Tnf-α as well as Vcam-1, as determined by qPCR and quantitative immunohistochemistry. In addition, in vitro mechanistic studies revealed a reduction of these pro-inflammatory and pro-atherosclerotic mediators in C5ar2-deficient macrophages. Finally, blocking C5ar1 with antagonist JPE1375, in C5ar2(-/-)/Apoe(-/-) mice, led to a further reduction in neointimal plaque formation with reduced inflammation. In conclusion, C5ar2 deficiency attenuates atherosclerosis and neointimal plaque formation after arterial injury. This identifies C5aR2 as a promising target to reduce atherosclerosis and restenosis after vascular interventions." @default.
• W1829947658 created "2016-06-24" @default.
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• W1829947658 date "2015-01-01" @default.
• W1829947658 modified "2023-09-23" @default.
• W1829947658 title "Atheroprotective role of C5ar2 deficiency in apolipoprotein E-deficient mice" @default.
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• W1829947658 doi "https://doi.org/10.1160/th14-12-1075" @default.
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