During the resolution phase of inflammation, the 'corpses' of apoptotic leukocytes are gradually cleared by macrophages. Here we report that during the resolution of peritonitis, the CCR5 chemokine receptor ligands CCL3 and CCL5 persisted in CCR5-deficient mice. CCR5 expression on apoptotic neutrophils and activated apoptotic T cells sequestered and effectively cleared CCL3 and CCL5 from sites of inflammation. CCR5 expression on late apoptotic human polymorphonuclear cells was downregulated by proinflammatory stimuli, including tumor necrosis factor, and was upregulated by 'proresolution' lipid mediators, including lipoxin A4, resolvin E1 and protectin D1. Our results suggest that CCR5+ apoptotic leukocytes act as 'terminators' of chemokine signaling during the resolution of inflammation.

译文

在炎症消退阶段,凋亡白细胞的“尸体”被巨噬细胞逐渐清除。在这里,我们报告在解决腹膜炎期间,CCR5趋化因子受体配体CCL3和CCL5在CCR5缺陷型小鼠中持续存在。 CCR5在凋亡中性粒细胞和活化的凋亡T细胞上的表达被隔离并有效地从炎症部位清除了CCL3和CCL5。晚期凋亡的人多形核细胞上的CCR5表达被促炎刺激(包括肿瘤坏死因子)下调,并被“促分辨率”脂质介质(包括脂蛋白A4,resolvin E1和保护素D1)上调。我们的结果表明,CCR5凋亡性白细胞在炎症消退过程中充当趋化因子信号传导的“终止子”。

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