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. 1993 Dec;110(4):1614–1620. doi: 10.1111/j.1476-5381.1993.tb14009.x

Profile of capsaicin-induced mouse ear oedema as neurogenic inflammatory model: comparison with arachidonic acid-induced ear oedema.

H Inoue 1, N Nagata 1, Y Koshihara 1
PMCID: PMC2175857  PMID: 7508328

Abstract

1. We have investigated the mechanism of capsaicin-induced mouse ear oedema compared with that of arachidonic acid (AA)-induced ear oedema, and evaluated the possible involvement of neuropeptides in the development of capsaicin-induced oedema. 2. Topical application of capsaicin (0.1-1.0 mg per ear) to the ear of mice produced immediate vasodilatation and erythema followed by the development of oedema which was maximal at 30 min after the treatment. This oedema was of shorter duration with less swelling than AA-induced oedema (2.0 mg per ear). 3. Capsaicin-induced ear oedema was unaffected when inhibitors of arachidonate metabolites including platelet activating factor (PAF) were administered before capsaicin (250 micrograms per ear) application, while these agents significantly prevented AA-induced oedema. Dexamethasone, histamine H1 and/or 5-hydroxytryptamine (5-HT) antagonists, and substance P (SP) antagonists were effective in inhibiting both models. Furthermore, a Ca(2+)-channel blocker and the capsaicin inhibitor, ruthenium red, were effective inhibitors of capsaicin oedema but had no effect on AA-induced oedema. 4. Phosphoramidon (50 micrograms kg-1, i.v.), an endopeptidase inhibitor, markedly (P < 0.001) enhanced only capsaicin-induced ear oedema, but bestatin (0.5 mg kg-1, i.v.), an aminopeptidase, failed to enhance oedema formation. 5. Neuropeptides (1-100 pmol per site) such as rat calcitonin gene-related peptide (CGRP), SP, neurokinin A (NKA), and vasoactive intestinal peptide (VIP), which are released from capsaicin-sensitive neurones, caused ear oedema by intradermal injection. Furthermore, a synergistic effect of CGRP (10 fmol per site) and SP (10pmol per site) on oedema formation was observed.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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