Characterization of itch-associated responses of NC mice with mite-induced chronic dermatitis.

Abstract:

:To clarify the behavioral and pathological features of spontaneous scratching of NC mice with mite-induced chronic dermatitis, we investigated the spontaneous and pruritogen-evoked scratching of NC mice. Although the frequency of scratching of NC mouse did not increase under specific pathogen-free environment, it gradually and markedly increased from 3 to 6 weeks after transfer to conventional environment. The onset of increase in spontaneous scratching was similar to that of dermatitis development and the elevation of plasma concentration of immunoglobulin E. At chronic stage (16 weeks after environment change), the frequency of spontaneous scratching was roughly parallel to the degree of dermatitis, but not to the plasma concentration of immunoglobulin E. The spontaneous scratching of NC mice with dermatitis was inhibited by distraction and the opioid antagonist naltrexone, suggesting that the scratching is itch-associated response. An intradermal injection of serotonin, but not histamine and substance P, elicited scratching of the injected site. Methysergide and cyproheptadine inhibited the serotonin-induced scratching but not spontaneous scratching. The results suggest that marked elevation of plasma immunoglobulin E is not always the cause of spontaneous itch-associated response of NC mice with dermatitis. Serotonin, histamine and substance P may not play an important role in spontaneous itch-scratch response at a chronic stage.

journal_name

J Dermatol Sci

authors

Yamaguchi T,Maekawa T,Nishikawa Y,Nojima H,Kaneko M,Kawakita T,Miyamoto T,Kuraishi Y

doi

10.1016/s0923-1811(00)00099-2

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

20-8

issue

1

eissn

0923-1811

issn

1873-569X

pii

S0923-1811(00)00099-2

journal_volume

25

pub_type

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