浅海性および深海性板鰓類の網膜色素上皮細胞の微細構造について〔英文〕

概要

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The retinal pigment epithelial cells (RPE cells) in a littoral elasmobranch (Triakis scyllia) and those of a deep sea elasmobranch (Deania eglantina) were similar in their fine structures with the same cell organelles. These RPE cells were completely lacking in pigment granules. However, differences in the following were also found between the two species; the size of the RPE cells, the developmental degree of the basal cytoplasmic infoldings and the density of mito-chondria. The RPE single-cell layer of Triakis was thick (13-18μm) with well developed basal cytoplasmic infoldings. In contrast, that of Deania was thin (6-10μm) with less developed basal cytoplasmic infoldings. Mitochondria were observed at the basal zone of the RPE cells of both species, but they were more abundant in Triakis than in Deania. So it was estimated that the activity of RPE cells in Triakis is higher than that of Deania. This may be due to the differences of the light in the environments they live in, shallow and deep waters.
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