A novel ligand of the formyl peptide receptor: annexin I regulates neutrophil extravasation by interacting with the FPR
- PMID: 10882119
- DOI: 10.1016/s1097-2765(00)80323-8
A novel ligand of the formyl peptide receptor: annexin I regulates neutrophil extravasation by interacting with the FPR
Abstract
The glucocorticoid-regulated protein annexin I (lipocortin I) has been shown to mediate antiinflammatory activities of glucocorticoids, but the molecular basis of its action has remained elusive. Here we show that annexin I acts through the formyl peptide receptor (FPR) on human neutrophils. Peptides derived from the unique N-terminal domain of annexin I serve as FPR ligands and trigger different signaling pathways in a dose-dependent manner. Lower peptide concentrations possibly found in inflammatory situations elicit Ca2+ transients without fully activating the MAP kinase pathway. This causes a specific inhibition of the transendothelial migration of neutrophils and a desensitization of neutrophils toward a chemoattractant challenge. These findings identify annexin I peptides as novel, endogenous FPR ligands and establish a mechanistic basis of annexin I-mediated antiinflammatory effects.
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