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首页> 外文期刊>Journal of Cellular Physiology >Melanocytes expressing MC1R polymorphisms associated with red hair color have altered MSH-ligand activated pigmentary responses in coculture with keratinocytes.
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Melanocytes expressing MC1R polymorphisms associated with red hair color have altered MSH-ligand activated pigmentary responses in coculture with keratinocytes.

机译:黑色素细胞表达受体多态性与红头发的颜色改变了MSH-ligand激活色素反应coculture角质细胞。

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摘要

The occurrence of red hair and pale skin in individuals, which is associated with UV-radiation sensitivity and increased skin cancer risk, is mainly due to polymorphisms in the melanocortin-1 receptor (MC1R) expressed in melanocytes. We have established a serum free human melanocyte-keratinocyte coculture system to study the behavior and functional abilities of melanocytes expressing MC1R red hair color (RHC) variants in order to identify differences from their wild type (WT) counterparts. This model revealed the importance of elevated calcium levels in promoting strong melanocyte interaction with the surrounding keratinocytes and resulted in a dendritic melanocyte morphology similar to that in skin. However, the dendricity response following agonist activation of the MC1R receptor by NDP-MSH peptide, was markedly enhanced in WT melanocytes in comparison to RHC strains. Analysis of mRNA expression and protein levels of the major pigmentation markers following NDP-MSH treatment distinguished the enzyme dopachrome tautomerase as preferentially upregulated in cocultures of WT strains, with negligible or a much reduced response in melanocytes with RHC variant alleles. These results highlight the use of the coculture system in determining fundamental differences in the physiology of melanocytes expressing RHC MC1R receptors and those of WT genotype, which are likely to contribute to the increased skin cancer risk for individuals that carry these variants.
机译:红色的头发和白皮肤的发生个人,是相关联的紫外线敏感皮肤和增加罹患癌症的风险,主要是由于多态性肾上腺皮质受体(受体)的表达黑色素细胞。人类melanocyte-keratinocyte coculture系统学习的行为和功能的能力黑色素细胞表达受体的红头发颜色(RHC)从变异以识别差异野生型(WT)同行。揭示了高钙的重要性水平在促进强劲的黑素细胞的相互作用与周围的角质细胞和结果在树突黑素细胞形态相似在皮肤上。黑素皮质素受体激动剂激活后在WT由NDP-MSH肽显著增强黑色素细胞相比RHC菌株。信使rna和蛋白质水平的表达分析NDP-MSH后的主要色素标记杰出的酶dopachrome治疗tautomerase作为优先调节cocultures WT菌株,或可以忽略不计多响应与RHC黑色素细胞减少不同的等位基因。coculture系统的决定基本的生理差异黑色素细胞表达RHC受体受体WT基因型的,也有可能有助于增加皮肤癌的风险个人携带这些变体。

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