DERMAL CHROMATOPHORE UNIT
DERMAL CHROMATOPHORE UNIT
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DOI：
10.1083/jcb.38.1.67
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发表时间：
1968-01-01
影响因子：
7.8
通讯作者：
HADLEY, ME
中科院分区：
文献类型：
--
作者：
BAGNARA, JT;TAYLOR, JD;HADLEY, ME
两栖动物的快速颜色变化是由三种类型的真皮色素团介导的：黄色素团、虹色团和黑色素团，它们组成了一个形态和生理上独特的结构——真皮色素团单位。叶黄素是最外层的元素，位于基板的正下方。含有反射光的细胞器的虹膜团位于黄素团的下方。每个虹膜下都有一个黑素细胞，其突起围绕着虹膜向上延伸。手指状结构从这些过程中突出，并占据了黄细胞和虹细胞之间的固定空间。当青蛙变黑时，黑素体从黑素细胞的身体向上移动，填满手指，然后掩盖上面的虹膜。快速的焯水是通过从这些手指排出黑素体来完成的。从黄褐色到绿色的浅色是由覆盖在上面的黄绿色和彩虹色提供的。详细介绍了色素团的结构，并讨论了色素团类型之间密切接触的性质。
Rapid color changes of amphibians are mediated by 3 types of dermal chromatophores, xanthophores, iridophores, and melano-phores, which comprise a morphologically and physiologically distinct structure, the dermal chromatophore unit. Xanthophores, the outermost element, are located immediately below the basal lamella. Iridophores, containing light-reflecting organelles, are found just beneath the xanthophores. Under each iridophore is a melanophore from which processes extend upward around the iridophore. Finger-like structures project from these processes and occupy fixed spaces between the xanthophores and iridophores. When a frog darkens, melanosomes move upward from the body of the melanophore to fill the fingers which then obscure the overlying iridophore. Rapid blanching is accomplished by the evacuation of melanosomes from these fingers. Pale coloration ranging from tan to green is provided by the overlying xanthophores and iridophores. Details of chromatophore structure are presented, and the nature of the intimate contact between the chromatophore types is discussed.