FPR2/ALX receptor expression and internalization are critical for lipoxin A4 and annexin-derived peptide-stimulated phagocytosis.

FPR2/ALX receptor expression and internalization are critical for lipoxin A4 and annexin-derived peptide-stimulated phagocytosis.
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DOI:
10.1096/fj.10-159913
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发表时间:
2010-11
期刊:
FASEB journal : official publication of the Federation of American Societies for Experimental Biology
影响因子:
--
通讯作者:
Godson C
Godson C
中科院分区:
其他
文献类型:
--
作者:
Maderna P;Cottell DC;Toivonen T;Dufton N;Dalli J;Perretti M;Godson C

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脂氧素 (LX) 是内源性产生的类二十烷酸,具有众所周知的抗炎和促消退活性,可刺激巨噬细胞对凋亡细胞的非炎性吞噬作用。 LXA4 和糖皮质激素衍生的膜联蛋白 A1 肽 (Ac2-26) 与常见的 G 蛋白偶联受体(称为 FPR2/ALX)结合。然而,FPR2/ALX 参与 LXA4 的抗炎和促消退活性的直接证据仍有待研究。在这里,我们描述了 FPR2/ALX 运输对 LXA4 和 Ac2-26 刺激的反应。我们用 HA 标记的 FPR2/ALX 转染细胞,并使用多种方法(包括免疫荧光共聚焦显微镜、冷冻切片的免疫金标记和 ELISA)研究未刺激、LXA4 (1–10 nM) 和 Ac2–26 (30 μM) 处理的细胞中的受体运输,并研究了激动剂刺激的吞噬作用中的受体运输。我们得出结论,FPR2/ALX 的 PKC 依赖性内化是吞噬作用所必需的。使用 FPR2/ALX 直系同源物 Fpr2 已被删除的小鼠的骨髓源性巨噬细胞 (BMDM),我们观察到该受体在 LXA4 和 Ac2-26 刺激的凋亡中性粒细胞吞噬作用中的非冗余功能。 LXA4 刺激野生型小鼠的 BMDM 的吞噬作用比基础值高 1.7 倍(P<0.001),而对 Fpr2−/− 小鼠的 BMDM 没有发现影响。同样,Ac2-26 刺激野生型小鼠 BMDM 的吞噬作用是基础值的 1.5 倍(P<0.05)。然而,相对于媒介物,Ac2-26 未能刺激从 Fpr2−/− 小鼠中分离出的 BMDM 的吞噬作用。这些数据揭示了 FPR2/ALX 受体运输的新颖而复杂的机制以及在炎症消退中的功能。
Lipoxins (LXs) are endogenously produced eicosanoids with well-described anti-inflammatory and proresolution activities, stimulating nonphlogistic phagocytosis of apoptotic cells by macrophages. LXA4 and the glucocorticoid-derived annexin A1 peptide (Ac2–26) bind to a common G-protein-coupled receptor, termed FPR2/ALX. However, direct evidence of the involvement of FPR2/ALX in the anti-inflammatory and proresolution activity of LXA4 is still to be investigated. Here we describe FPR2/ ALX trafficking in response to LXA4 and Ac2–26 stimulation. We have transfected cells with HA-tagged FPR2/ALX and studied receptor trafficking in unstimulated, LXA4 (1–10 nM)- and Ac2–26 (30 μM)-treated cells using multiple approaches that include immunofluorescent confocal microscopy, immunogold labeling of cryosections, and ELISA and investigated receptor trafficking in agonist-stimulated phagocytosis. We conclude that PKC-dependent internalization of FPR2/ALX is required for phagocytosis. Using bone marrow-derived macrophages (BMDMs) from mice in which the FPR2/ALX ortholog Fpr2 had been deleted, we observed the nonredundant function for this receptor in LXA4 and Ac2–26 stimulated phagocytosis of apoptotic neutrophils. LXA4 stimulated phagocytosis 1.7-fold above basal (P<0.001) by BMDMs from wild-type mice, whereas no effect was found on BMDMs from Fpr2−/− mice. Similarly, Ac2–26 stimulates phagocytosis by BMDMs from wild-type mice 1.5-fold above basal (P<0.05). However, Ac2–26 failed to stimulate phagocytosis by BMDMs isolated from Fpr2−/− mice relative to vehicle. These data reveal novel and complex mechanisms of the FPR2/ALX receptor trafficking and functionality in the resolution of inflammation.
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