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- W2018300504 abstract "The aim of this study is to investigate the regulation of the human melanocortin 1 receptor (MC1R) expression in cultured normal human melanocytes (NHM) by specific paracrine and endocrine factors, and by ultraviolet radiation (UVR). Treatment of NHM with α ‐melanotropin [ α ‐melanocyte stimulating hormone ( α ‐MSH)] increased MC1R mRNA level; the response was often more pronounced in NHM with a low (NHM‐c) than in NHM with a high melanin content (NHM‐b). Endothelin‐1 increased MC1R mRNA level in NHM regardless of their melanin content. Basic fibroblast growth factor consistently up regulated MC1R mRNA level in NHM‐b but not in NHM‐c. Activation of protein kinase C by 12‐0‐tetradecanoylphorbol‐13‐acetate slightly increased, while stimulation of adenylate cyclase by forskolin markedly up‐regulated the MC1R mRNA level. β ‐Estradiol increased, and combined treatment with β ‐estradiol and α‐MSH further elevated, MC1R mRNA level in NHM‐c and NHM‐b. Testosterone reduced, while progesterone had no effect on, MC1R mRNA level. Agouti signaling protein reduced, and UVR down regulated dose‐dependently MC1R mRNA level in NHM‐b and NHM‐c. This effect was reversed 24 h after irradiation with the lower doses of 7 or 14 mJ/cm 2 , but not after exposure to a higher, more cytotoxic dose of UVR. We conclude that the MC1R is regulated by paracrine factors, including its own ligands, by specific endocrine sex hormones, and by UVR. Differences in the responses of NHM to some of these factors suggest differential regulation of MC1R gene expression, which may contribute to the variation in constitutive and UV‐induced cutaneous pigmentation in humans." @default.
- W2018300504 created "2016-06-24" @default.
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- W2018300504 date "2002-11-23" @default.
- W2018300504 modified "2023-10-15" @default.
- W2018300504 title "Regulation of the Human Melanocortin 1 Receptor Expression in Epidermal Melanocytes by Paracrine and Endocrine Factors and by Ultraviolet Radiation" @default.
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- W2018300504 doi "https://doi.org/10.1034/j.1600-0749.2002.02051.x" @default.
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