魚類消化管上皮のPear-shaped Cell (Rodlet Cell) について

概要

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It is well known that so-called “pear-shaped cell” or “rodlet cell” is found to occur in the epithelium of the digestive tract of fishes. In the black rockfish, Sebastes inermis CUVIER, pear-shaped cells are frequently found among the columnar epithelial cells and goblet cells forming the lining epithelium of pyloric caeca (Figs. 1 and 2). Electron microscopy revealed that the cell is enclosed by a thick fibrous capsular wall (Fig. 3). Mitochondria are clustered in the apical cytoplasm. The nucleus is located at the basal end. A moderate amount of endoplasmic reticulum is scattered in the remainder of the cytoplasm as well as vesicles, vacuoles, and ribosomes. The rodlets lying parallel to the long axis of the cell are composed of three principal layers; dense central axis, moderately dense medullary part, and thin cortical layer (Fig. 3). Judging from the evidence of fine structure, it is conceivable that the pear-shaped cell is protozoan parasite, not a tissue cell. However, the taxonomic status of this peculiar parasite is uncertain.
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