正常ならびにウイルス感染ヤマメ腎由来細胞の微細形態〔英文〕

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The normal and virus-infected cells of the cell line, YNK, derived from the kidney of Yamame, Oncorhynchus masou, were studied at the ultrastructural level. The spindle-shaped YNK cells had an elongated nucleus with one or two nucleoli. Very prominent desmosomes were often seen between two neighbouring cells. The cells had a well developed rough-surfaced endoplasmic reticulum (rER) and numerous mitochondria. Many small vasicular invaginations, one of the characteristics of active pinocytotic cells, were seen adjacent to the cell membrane. These properties suggest that YNK cells were derived from the epithelium of the distal tubules of the collecting tubules of Yamame kidney. YNK cells had at least 10 times the sensitivity of RTG-2 cells to the infectious pancreatic necrosis virus. The virus particles were found in the cisternae of the well developed rER. Those facts sugest that the main target cells of the virus are the epithelial cells with well developed rER, such as pancreatic aciner cells, renal tubular epithelial cells, and liver parenchymal cells. YNK cells also had as much sensitivity against the infectious hematopoietic necrosis virus as that of RTG-2 cells. Numerous virus particles were found in intercellular spaces, and were matured by budding from the plasma membrane.
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