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.
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.
Authors: Wei Wang; Jonathan A Cohen; Antonia Wallrapp; Kenneth G Trieu; Juliana Barrios; Fengzhi Shao; Nandini Krishnamoorthy; Vijay K Kuchroo; Matthew R Jones; Alan Fine; Yan Bai; Xingbin Ai Journal: Immunity Date: 2019-11-19 Impact factor: 31.745
Authors: Rodrigo Arreola; Samantha Alvarez-Herrera; Gilberto Pérez-Sánchez; Enrique Becerril-Villanueva; Carlos Cruz-Fuentes; Enrique Octavio Flores-Gutierrez; María Eugenia Garcés-Alvarez; Dora Luz de la Cruz-Aguilera; Emilio Medina-Rivero; Gabriela Hurtado-Alvarado; Saray Quintero-Fabián; Lenin Pavón Journal: J Immunol Res Date: 2016-10-04 Impact factor: 4.818