Itch-scratch responses induced by lysophosphatidic acid in mice - PubMed (original) (raw)

Itch-scratch responses induced by lysophosphatidic acid in mice

Terumasa Hashimoto et al. Pharmacology. 2004 Sep.

Abstract

The present investigation was conducted in order to determine whether lysophosphatidic acid (LPA) induces itch-scratch responses (ISRs) in mice. Intradermal administration of LPA induces ISRs; furthermore, the time course for LPA-induced ISRs was similar to that for histamine-induced responses. Comparative study of the pruritogenic activity revealed that histamine possessed a potent effect characterized by a dose-response relationship; however, prostaglandin D2 failed to induce this response. Pretreatment with ketotifen, a histamine H1 receptor antagonist, and capsaicin inhibited LPA-induced ISRs. Additionally, LPA-induced ISRs were abolished by Y-27632, an inhibitor of Rho-associated protein kinase (ROCK). These findings suggest that LPA-induced ISRs are attributable to histamine- and substance-P-mediated pathways. Moreover, the Rho/ROCK-mediated pathway may be involved.

Copyright 2004 S. Karger AG, Basel

PubMed Disclaimer

Similar articles

Cited by

MeSH terms

Substances

LinkOut - more resources