Ontogenetic Development of the Caudal Neurosecretory System in the Chum Salmon, Oncorhynchus keta, with Regard to Its Ultrastructural Changes and with Relation to Neuropeptide Y-immunoreactive Fibers(Endocrinology)
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概要
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The ontogeny of the caudal neurosecretory cells (Dahlgren cells) in the caudal spinal cord of the chum salmon, Oncorhynchus keta, was examined by conventional electron microscopy and with immunohistochemistry for urotensins (U) and neuropeptide Y (NPY). The precursors of the Dahlgren cells first appeared as agranular ovoid cells in the caudal region of the neural tube of 40-day-old embryos about one week before hatching. The occurrence of cytoplasmic granules in the immature Dahlgren cells became evident by the 14th day after hatching. At this moment, the U-positive reaction was merely demonstrated in some of the granules. Close association of NPY-positive fibers with the caudal neurosecretory structures was recognizable in 1-month-old larvae. Thus, it is apparent that the salmon Dahlgren cells start their secretory activity (production of the secretory granules) in early larval stages and that, thereafter, NPYergic afferent innervation of the caudal neurosecretory system becomes evident.
- 社団法人日本動物学会の論文
- 2000-01-20
著者
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CHIBA Akira
Department of Biology, School of Life Dentistry at Niigata, The Nippon Dental University
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Chiba A
Department Of Biology Nippon Dental University School Of Dentistry At Niigata
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Honma Yoshiharu
Division Of Microscopic Anatomy And Bio-imaging Department Of Cellular Function Niigata University G
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Oka Shunya
Department of Biology, Nippon Dental University School of Dentistry at Niigata
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Honma Yoshiharu
Department of Anatomy, Niigata University School of Medicine
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Oka Shunya
Department Of Biology Nippon Dental University School Of Dentistry At Niigata
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Honma Y
Third Department Of Anatomy Niigata University School Of Medicine
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Chiba Akira
Department Of Biology Nippon Dental University School Of Dentistry At Niigata
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Honma Yoshiharu
Department Of Anatomy Niigata University School Of Medicine
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Chiba Akira
Department Of Biology Nippon Dental University
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