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Mori, Tomoko; Kabashima, Kenji; Fukamachi, Shoko; Kuroda, Etsushi; Sakabe, Jun-ichi; Kobayashi, Miwa; Nakajima, Saeko; Nakano, Kazuhisa; Tanaka, Yoshiya; Matsushita, Sho; Nakamura, Motonobu; Tokura, Yoshiki
Journal of dermatological science, 07/2013, Letnik: 71, Številka: 1Journal Article
Abstract Background Dopamine transduces signals via five subtypes of G protein-coupled receptors. Among these subtypes, the D1 and D5 receptors belong to the D1-like group. Although dopamine is known to mediate immune responses, its involvement in cutaneous immunity remains unclear. Objective The aim of this study is to determine the role of dopamine and its D1-like receptors in cutaneous immune responses. Methods By using the D1-like receptor antagonist SCH 23390, we examined the role of D1-like receptors in murine models of Th1-type contact hypersensitivity and Th2-type atopic dermatitis in vivo , and in mast cells and Th2 cell differentiation in vitro. Results Administration of SCH 23390 did not affect Th1-type contact hypersensitivity but suppressed the immediate-type reaction (ITR) and the late phase reaction (LPR) in the atopic dermatitis model. In addition, SCH 23390-treated mice showed higher IFN-γ and lower IL-4 mRNA levels in the ear skin of challenged mice than did non-treated mice as analyzed by real-time RT PCR. Consistently, the passive cutaneous anaphylaxis reaction was significantly reduced in SCH 23390-treated mice. Moreover, dopamine enhanced mast cell degranulation and Th2 cell differentiation, and both activities were abrogated by SCH 23390. Conclusion These findings suggest that the D1-like receptors mediate immediate and late phase skin reactions by promoting Th2 induction and mast cell degranulation.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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