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首页> 外文期刊>Nature immunology >The Duffy antigen receptor for chemokines transports chemokines and supports their promigratory activity.
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The Duffy antigen receptor for chemokines transports chemokines and supports their promigratory activity.

机译:Duffy趋化因子抗原受体转运趋化因子并支持其扩散活性。

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The Duffy antigen receptor for chemokines (DARC) belongs to a family of 'silent' heptahelical chemokine receptors that do not couple to G proteins and fail to transmit measurable intracellular signals. DARC binds most inflammatory chemokines and is prominently expressed on venular endothelial cells, where its function has remained contentious. Here we show that DARC, like other silent receptors, internalized chemokines but did not effectively scavenge them. Instead, DARC mediated chemokine transcytosis, which led to apical retention of intact chemokines and more leukocyte migration across monolayers expressing DARC. Mice overexpressing DARC on blood vessel endothelium had enhanced chemokine-induced leukocyte extravasation and contact-hypersensitivity reactions. Thus, interactions of chemokines with DARC support their activity on apposing leukocytes in vitro and in vivo.
机译:Duffy趋化因子抗原受体(DARC)属于“沉默的”七螺旋趋化因子受体家族,这些受体不与G蛋白偶联并且不能传递可测量的细胞内信号。 DARC与大多数炎性趋化因子结合,并在静脉内皮细胞上显着表达,在那里它的功能仍然存在争议。在这里,我们表明,DARC像其他沉默受体一样,可以内化趋化因子,但不能有效清除它们。取而代之的是,DARC介导的趋化因子转胞吞作用,导致完整趋化因子的根尖保留和更多的白细胞跨表达DARC的单层迁移。小鼠在血管内皮上过分表达DARC具有增强的趋化因子诱导的白细胞外渗和接触性超敏反应。因此,趋化因子与DARC的相互作用支持它们在体外和体内对白细胞并置的活性。

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