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:
影响因子:
--
通讯作者:
Godson C
中科院分区:
文献类型:
--
作者:
Maderna P;Cottell DC;Toivonen T;Dufton N;Dalli J;Perretti M;Godson C
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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影响因子:
20.3
作者:
Filep, JG;Zouki, C;Serhan, CN
通讯作者:
Serhan, CN
影响因子:
7.3
作者:
O'Sullivan, Timothy P.;Vallin, Karl S. A.;Guiry, Patrick J.
通讯作者:
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影响因子:
6
作者:
Maderna, P;Cottell, DC;Godson, C
通讯作者:
Godson, C
影响因子:
15.9
作者:
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通讯作者:
MADARA, JL
DOI:
10.1016/j.plefa.2005.05.003
发表时间:
2005-09-01
影响因子:
3
作者:
Chiang, N;Arita, M;Serhan, CN
通讯作者:
Serhan, CN