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• W2058406983 abstract "Polymorphonuclear neutrophil (PMN) extravasation requires selectin-mediated tethering, intercellular adhesion molecule-1 (ICAM-1)-dependent firm adhesion, and platelet/endothelial cell adhesion molecule 1 (PECAM-1)-mediated transendothelial migration. An important unanswered question is whether ICAM-1-activated signaling contributes to PMN transmigration mediated by PECAM-1. We tested this concept and the roles of endothelial nitric oxide synthase (eNOS) and Src activated by PMN ligation of ICAM-1 in mediating PECAM-1-dependent PMN transmigration. We observed that lung PMN infiltration in vivo induced in carrageenan-injected WT mice was significantly reduced in ICAM-1(-/-) and eNOS(-/-) mice. Crosslinking WT mouse ICAM-1 expressed in human endothelial cells (ECs), but not the phospho-defective Tyr(518)Phe ICAM-1 mutant, induced SHP-2-dependent Src Tyr530 dephosphorylation that resulted in Src activation. ICAM-1 activation also stimulated phosphorylation of Akt (p-Ser473) and eNOS (p-Ser1177), thereby increasing NO production. PMN migration across EC monolayers was abolished in cells expressing the Tyr(518)Phe ICAM-1 mutant or by pretreatment with either the Src inhibitor PP2 or eNOS inhibitor L-NAME. Importantly, phospho-ICAM-1 induction of Src signaling induced PECAM-1 Tyr686 phosphorylation and increased EC surface anti-PECAM-1 mAb-binding activity. These results collectively show that ICAM-1-activated Src and eNOS signaling sequentially induce PECAM-1-mediated PMN transendothelial migration. Both Src and eNOS inhibition may be important therapeutic targets to prevent or limit vascular inflammation." @default.
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• W2058406983 date "2012-08-30" @default.
• W2058406983 modified "2023-10-14" @default.
• W2058406983 title "ICAM-1–activated Src and eNOS signaling increase endothelial cell surface PECAM-1 adhesivity and neutrophil transmigration" @default.
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• W2058406983 doi "https://doi.org/10.1182/blood-2011-12-397430" @default.
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