Evidence for an anti-inflammatory loop centered on polymorphonuclear leukocyte formyl peptide receptor 2/lipoxin A4 receptor and operative in the inflamed microvasculature.

Evidence for an anti-inflammatory loop centered on polymorphonuclear leukocyte formyl peptide receptor 2/lipoxin A4 receptor and operative in the inflamed microvasculature.
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DOI:
10.4049/jimmunol.1003145
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发表时间:
2011-04-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Perretti M
Perretti M
中科院分区:
其他
文献类型:
--
作者:
Brancaleone V;Dalli J;Bena S;Flower RJ;Cirino G;Perretti M

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在急性炎症消退的总体背景下,促消退介质的重要性是公认的和突出的,尽管对这些抗炎和促消退分子是否协同作用知之甚少。在这里,我们专注于脂氧素A4(LXA 4)和膜联蛋白A1(AnxA 1),因为这两个非常不同的介质汇聚在一个单一的受体,甲酰肽受体2型(缩写FPR 2/ALX)。此外,LXA 4的人中性粒细胞引起浓度和时间依赖性动员的AnxA 1到质膜上,通过免疫印迹和流式细胞仪分析确定。另一种FPR 2/ALX激动剂antiflammin-2(AF 2)和部分fMLP或肽Ac 2 -26(一种AnxA 1衍生物,可激活人类FPR家族的所有三个成员)共享此特性。FPR 2/ALX拮抗剂阻断LXA 4和AF 2激活的AnxA 1动员。PMN脱粒模式和磷酸化AnxA 1状态的分析表明,两种FPR 2/ALX激动剂通过中间磷酸化步骤动员胞质(而不是颗粒)AnxA 1池的模型。对野生型和AnxA 1 −/−小鼠发炎的肠系膜微血管进行活体显微镜检查,发现LXA 4可引起前者毛细血管后微静脉内皮细胞的白细胞脱离(10分钟内>50%; P<0.05),但对后者基因型则无此作用(约15%; NS)。此外,在野生型小鼠中,LXA 4显著减弱了Gr 1+细胞向IL-1β致炎的背气囊中的募集,但在AnxA 1 −/−小鼠中则没有。总的来说,这些数据促使我们提出存在一个以中性粒细胞AnxA 1为中心并由选择性FPR 2/ALX激动剂激活的内源性抗炎网络。
The importance of proresolving mediators in the overall context of resolution of acute inflammation is accepted and prominent, though little is known on whether these anti-inflammatory and pro-resolving molecules act in concert. Here we focused on lipoxin A4 (LXA4) and annexin A1 (AnxA1) since these two very different mediators converge on a single receptor, formyl peptide receptor type 2 (acronym FPR2/ALX). Addition of LXA4 to human PMN provoked a concentration- and time-dependent mobilization of AnxA1 onto the plasma membrane, as determined by western blotting and flow cytometry analyses. This property was shared by another FPR2/ALX agonist, antiflammin-2 (AF2), and partly by fMLP or peptide Ac2-26 (an AnxA1 derivative which can activate all three members of the human FPR family). An FPR2/ALX antagonist blocked AnxA1 mobilization activated by LXA4 and AF2. Analysis of PMN degranulation patterns and phospho-AnxA1 status suggested a model where the two FPR2/ALX agonists mobilize the cytosolic (and not the granular) pool of AnxA1 through an intermediate phosphorylation step. Intravital microscopy investigations of the inflamed mesenteric microvasculature of wild type and AnxA1−/− mice revealed that LXA4 provoked leukocyte detachment from the post-capillary venule endothelium in the former (>50% within 10 min; P<0.05), but not the latter genotype (~15%; NS). Furthermore, recruitment of Gr1+ cells into dorsal air pouches, inflamed with IL-1β, was significantly attenuated by LXA4 in wild type, but not AnxA1−/− mice. Collectively, these data prompt us to propose the existence of an endogenous network in anti-inflammation centred on PMN AnxA1 and activated by selective FPR2/ALX agonists.
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膜联蛋白A1调节肠粘膜损伤,炎症和修复。
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发表时间: 2008-10-01
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