Well Developed Splenic Ellipsoids in Japanese Conger Conger myriaster

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  • Atsuta Shizuo
    Laboratory of Fish Pathology, School of Fisheries Sciences, Kitasato University
  • Watanabe Tasuku
    Laboratory of Fish Pathology, School of Fisheries Sciences, Kitasato University
  • Nakamura Hiroaki
    Laboratory of Biology, Tokyo Dental College
  • Kono Michiko
    Fisheries Research Laboratory, the University of Tokyo
  • Furukawa Kiyoshi
    Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, the University of Tokyo

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タイトル別名
  • Well Developed Splenic Ellipsoids in Japanese Conger <i>Conger myriaster</i>

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The histological examination of the spleen of Japanese conger Conger myriaster revealed that there were many eosinophilic island-like structures in splenic hematopoietic tissues, which consisted of large square cells and fibrous structure, when stained with hematoxylin and eosin. Silver stain showed these fibrous structures were composed of abundant reticular fibers that occasionally formed lattice structures. Electron microscopically, these structures consisted of cuboidal endothelial cells, reticular cells, and reticular fibers. In neighboring tissues, there were abundant thrombocytes, lymphoid cells, and macrophages (or monocytes). Basement membranes were poorly developed. When carbon suspensions were injected into the aortic bulb, carbon particles were ingested by macrophages and/or reticular cells in the islands, and were also observed on the bundles of reticular fibers. These data indicate that the eosinophilic island-like structures observed in Japanese conger spleens are well developed splenic ellipsoids, and suggest that such tissues provide a good model for the investigation of trapping foreign antigenic and non-antigenic substances in fish.

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