Differentiation of pigmented tissues in the eyes of medaka (Oryzias latipes) embryos : An electron microscope study
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概要
- 論文の詳細を見る
The formation of pigmented tissues in the eye of developing embryos of the wild-type strain of medaka, Oryzias latipes, was studied by transmission electron microscopy. Particular attention has been paid to morphological differentiation of pigmentary structures in pigment epithelial cells, choroid melanophores and choroid iridophores. Melanogenesis in pigment epithelium first occurs at stage 26 after formation of the proximal wall of the optic vesicle. Melanosomes, which are the sites of melanogenesis in pigment epithelium, are multivesicular and spherical at the onset of pigmentation; however, as development proceeds up to hatching, they acquire a long, ellipsoidal shape which is typical to this tissue. At the stages at which active melanogenesis occurs, most melanosomes in this tissue are formed by fusion of large and small vesicles into a multivesicular body, whereas the premelanosomes containing a lattice structure of fibrils occur at a limited frequency. The choroid iridophores appear by stage 28 along the outer region of pigment epithelium, and can be identified by the formation of reflecting platelets via multivesicular vesicles. Following the differentiation of these iridophores, the choroid melanophores appear between pigment epithelium and the layer of choroid iridophores. They contain spherical melanosomes, the morphological characteristics of which are similar to those of melanosomes in skin melanophores but different from those of melanosomes in pigment epithelial cells. All these findings indicate that in the eye of medaka, (1) the morphological properties of melanosomes in melanogenic cells are expressed in a tissue-specific manner, even though they are derived from similar multivesicular organelles and (2) melanosomes and reflecting platelets are formed from multivesicular organelles, which supports the suggestion of a common origin of pigment particles in vertebrate chromatophores.
- 名古屋大学の論文
著者
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Hirose Euichi
Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus
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Hirose Euichi
Department Of Biology Keio University:(present Office)biological Laboratory College Of Agriculture A
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Matsumoto Jiro
Department Of Biology Keio University
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Matsumoto Jiro
Department of Applied Pharmacology, Kyoto Pharmaceutical University
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