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首页> 外文期刊>Pigment cell research >The histological analysis, colorimetric evaluation, and chemical quantification of melanin content in 'suntanned' fish
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The histological analysis, colorimetric evaluation, and chemical quantification of melanin content in 'suntanned' fish

机译：“晒黑”鱼中黑色素含量的组织学分析，比色评估和化学定量

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Human melanocytes respond to UV irradiation by increasing the synthesis of melanin. While much is now understood of the pathways governing this process and the nature of the melanin synthesized, little is known of melanins produced by lower vertebrates and their capacity to respond to UV. Here we report that a fish, red seabream, can undergo 'suntanning'. Histological, colorimetric and chemical assays were performed for suntanned red seabream fish bred in net cages to analyse the melanins and compared with shaded or wild red seabream fish. For color evaluation, the L* values of suntanned fish were dramatically lower than those in the other two groups. Pyrrole-2,3,5-tricarboxylic acid (PTCA), an indicator of eumelanin, was detected in suntanned fish at five times higher levels than in shaded or wild fish while 4-amino-3-hydroxyphenyl-alanine (4-AHP), a marker for pheomelanin, could not be detected in any of the samples. Histological analysis showed that melanocytes in the suntanned skin enlarged and increased in number to form a monolayer at the surface of the skin. Analysis of L* values and PTCA levels showed quite a high correlation coefficient (r = -0.843). When comparing shaded and wild red seabream fish, the scores were closer but some significant differences were still found in some body areas. These results indicate that eumelanin accumulates in suntanned fish during the increase in skin color, which is induced by sunlight, presumably by ultraviolet radiation.
机译：人类黑素细胞通过增加黑色素的合成来响应紫外线。尽管现在人们对控制该过程的途径和合成的黑色素的性质了解很多，但对低等脊椎动物产生的黑色素及其对紫外线的反应能力知之甚少。在这里，我们报告说，一条红鲷鱼可能会经历“晒黑”。对在网箱中饲养的晒黑红鲷鱼进行了组织学，比色和化学分析，以分析黑色素，并与遮荫或野生红鲷鱼进行了比较。为了评估颜色，晒黑鱼的L *值显着低于其他两组。晒黑鱼中的吡咯-2,3,5-三羧酸（PTCA）含量为深紫或野生鱼中五倍，而4-氨基-3-羟基苯基丙氨酸（4-AHP）中的含量为五倍在所有样品中均未检测到pheomelanin标记。组织学分析表明，被晒黑的皮肤中的黑素细胞数量增加并增加，在皮肤表面形成单层。 L *值和PTCA含量的分析显示出很高的相关系数（r = -0.843）。比较遮荫的和野生的红鲷鱼时，得分相近，但在某些身体部位仍发现一些显着差异。这些结果表明，在阳光下，大概是紫外线辐射的诱导下，在皮肤颜色增加的过程中，Eumelanin会在晒黑的鱼中积累。

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