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Differential itch- and pain-related behavioral responses and µ-opoid modulation in mice.

Authors
  • Akiyama, Tasuku
  • Carstens, Mirela Iodi
  • Carstens, Earl
Type
Published Article
Journal
Acta Dermato Venereologica
Publisher
Acta Dermato-Venereologica
Publication Date
Nov 01, 2010
Volume
90
Issue
6
Pages
575–581
Identifiers
DOI: 10.2340/00015555-0962
PMID: 21057739
Source
Medline
License
Unknown

Abstract

Intradermal microinjection of the pruritogen histamine, or the algogen capsaicin, in the mouse cheek differentially elicits mainly hindlimb scratching or ipsilateral forelimb wiping, respectively. We investigated the dose-dependency of these responses elicited by various pruritogens and algogens, and µ-opioid modulation. Histamine, 5-hydro-xytryptamine (5-HT) and agonists of protease-activated receptors PAR-2 and PAR-4, all elicited dose-related hindlimb scratching bouts with little forelimb wiping. In contrast, capsaicin, allyl isothiocyanate and bradykinin elicited dose-related forelimb wiping with little scratching. Morphine reduced capsaicin-evoked wiping but not pruritogen-evoked scratching. The µ-antagonist naltrexone decreased pruritogen-evoked scratching but not capsaicin-evoked wiping. A cowhage spicule inserted intradermal elicited equivalent scratching and wiping, while inactivated cowhage spicules loaded with histamine or capsaicin elicited significantly more scratching or wiping, respectively. The mouse cheek injection model appears to be a useful behavioral test that distinguishes between itch and pain.

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