Abstract
In complete Freund's adjuvans (CFA) inflammation opioid containing neutrophils release opioid peptides upon stimulation and mediate peripheral analgesia. Neutrophil migration is regulated partially by chemokines, but other mediators e.g. formyl peptides could also contribute. In vitro, formyl peptides but not Mycobacterium butyricum (CFA component) induced migration of neutrophils. In contrast, local formyl peptide injection did not induce leukocyte recruitment in vivo due to insufficient up-regulation of adhesion molecule expression. Furthermore, leukocyte recruitment and peripheral opioid-mediated analgesia were unaffected by systemic formyl peptide receptor blockade in CFA inflammation. Thus, while formyl peptides do not regulate migration they directly stimulate opioid peptide release.
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