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• W2287268896 endingPage "543" @default.
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• W2287268896 abstract "Abstract Psoralen and UVA ( PUVA ) has immunosuppressive and proapoptotic effects, which are thought to be responsible alone or in combination for its therapeutic efficacy. However, the molecular mechanism by which PUVA mediates its effects is not well understood. Activation of the serotonin (5‐hydroxytryptamine, 5‐ HT ) pathway has been suggested to be involved in the modulation of T‐cell responses and found to mediate UVB ‐induced immune suppression. In particular, the activation of the 5‐ HT 2A receptor has been proposed as one mechanism responsible for UV ‐induced immune suppression. We therefore hypothesized that 5‐ HT may play a role in PUVA ‐induced effects. The model of systemic suppression of delayed‐type hypersensitivity ( DTH ) to Candida albicans was used to study immune function after exposure of C3H and KIT W ‐Sh/W‐Sh mice to a minimal inflammatory dose of topical PUVA . The intra‐peritoneal injection of the 5‐ HT 2 receptor antagonist ketanserin or cyproheptadine or an anti‐5‐ HT antibody immediately before PUVA exposure entirely abrogated suppression of DTH but had no significant effect on inflammation, as measured by swelling and cellular infiltration of the skin, and apoptosis as determined by the number of sunburn cells in C3H mice. Importantly, the systemic injection of 5‐ HT recapitulated PUVA immune suppression of DTH but did not induce inflammation or apoptosis in the skin. KIT W ‐Sh/W‐Sh mice (exhibiting myelopoietic abnormalities, including lack of 5‐ HT ‐containing mast cells) were resistant to PUVA ‐induced suppression of DTH but not local skin swelling. Thus, this points towards a crucial role of 5‐ HT signalling in PUVA ‐induced immune suppression but not inflammation or apoptosis in situ in the skin." @default.
• W2287268896 created "2016-06-24" @default.
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• W2287268896 date "2016-04-18" @default.
• W2287268896 modified "2023-09-27" @default.
• W2287268896 title "Serotonin signalling is crucial in the induction of PUVA-induced systemic suppression of delayed-type hypersensitivity but not local apoptosis or inflammation of the skin" @default.
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• W2287268896 doi "https://doi.org/10.1111/exd.12990" @default.
• W2287268896 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4927393" @default.
• W2287268896 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26914366" @default.
• W2287268896 hasPublicationYear "2016" @default.
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