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Carbohydrates in the epidermal mucous cells of a fresh-water fish Mastacembelus pancalus as studied by electron-microscopic cytochemical methods



Carbohydrates in the epidermal mucous cells of a fresh-water fish Mastacembelus pancalus as studied by electron-microscopic cytochemical methods



Cell & Tissue Research 280(3): 531-539



Carbohydrates in the mucous cells of the epidermis of the fish Mastacembelus pancalus were studied by means of electron-microscopic cytochemical methods using physical development procedures. Three types of mucous cells (types A-C) were differentiated on the basis of the reactivities of the secretory products elaborated by them. The carbohydrate contents of mucous globules predominantly comprised sulfate esters and traces of oxidizable vicinal diols in type-A cells, oxidizable vicinal diols in type-B cells, and moderate amounts of both sulfate esters and oxidizable vicinal diols in type-C cells. Glycogen particles were also found to occur in the cytoplasm of these cells, and glycoproteins containing oxidizable vicinal diols were visualized in Golgi cisternae, rough endoplasmic reticulum, nuclear envelopes, and plasma membranes. In the type-A and type-B cells situated in the superficial layers of the epidermis, extensive cisternae of the Golgi apparatus and copious rough endoplasmic reticulum suggested the active syntheses of secretory contents, in contrast to the type-C mucous cells, which displayed poor development of these organelles, in the deeper layers.

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