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Serotonin in human skin
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    In this review the authors summarize data of a potential role for serotonin in human skin physiology and pathology. The uncovering of endogenous serotonin synthesis and its transformation to melatonin underlines a putative important role of this pathway in melanocyte physiology and pathology. Pathways of the biosynthesis and biodegradation of serotonin have been characterized in human beings and its major cellular populations. Moreover, receptors of serotonin are expressed on keratinocytes, melanocytes, and fibroblasts and these mediate phenotypic actions on cellular proliferation and differentiation. And the widespread expression of a cutaneous seorotoninergic system indicates considerable selectivity of action to facilitate intra-, auto-, or paracrine mechanisms that define and influence skin function in a highly compartmentalized manner. Melatonin, in turn, can also act as a hormone, neurotransmitter, cytokine, biological modifier and immunomodulator. Thus, Serotonin local synthesis and cellular localization could thus become of great importance in the diagnosis and management of cutaneous pathology.

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Jianguo Huang, Qiying Gong, Guiming Li.[J].南京医科大学学报(自然科学版),2005,19(4):

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