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KMID : 0606920100180030316
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Biomolecules & Therapeutics
2010 Volume.18 No. 3 p.316 ~ p.320
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Glucosylsphingosine Induces Itch-Scratch Responses in Mice
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Kim Hyoung-June
Kim Kwang-Mi
Noh Min-Soo
Yoo Hye-Jin
Lee Chang-Hoon
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Abstract
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Pruritus is one of major symptoms in atopic dermatis. The pathophysiological mechanism of pruritus is unclear. The search for pruritogen is important in elucidating the pathophysiological mechanism of pruritus in atopic dermatitis. Glucosylsphingosine (Gsp) is upregulated in the strateum corneum of atopic dermatitis patients. We investigated to determine whether Gsp induces itch-scratch responses (ISRs) in mice. Intradermal administration of Gsp induces ISRs. Gsp dose-dependently induced scratching response at 50-500 nmol/site range. Pretreatment with naltrexone, an opioid receptor antagonist, and capsaicin, a TrpV1 receptor agonist, inhibited Gsp-induced ISRs. Additionally, Gsp-induced ISRs were also suppressed by cyproheptadine, an antagonist of serotonin receptor. These findings suggest that Gsp-induced scratching might be at least partly mediated by capsaicin-sensitive primary afferents, and the opioids receptor systems might be involved in transmission of itch signaling in the central nervous system. Furthermore, our findings suggest that Gsp-induced ISRs may be attributable to the serotonin-mediated pathways and Gsp is not any more one of byproducts of abnormal skin barrier but can lead to induce pruritus, one of typical symptoms of atopic dermatitis.
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KEYWORD
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Glucosylsphingosine, Itch-scratch response, Capsaicin, Naltrexone, Cyproheptadine
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