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p-Nitrophenyl phosphatase (p-NPPase) activity of (Na+-K+)-activated adenosine triphosphatase ((Na+-K+)-ATPase) on the acinar cells of dog submandibular gland was demonstrated by using light microscopy. The reaction products of p-NPPase of fresh frozen sections were seen to be localized on the basal parts of acini, and disappeared when the sections were incubated in medium containing 10(-3) Mouabain or in a K-free medium. Under the electron microscope, the reaction products of ATPase were found to be localized on the basolateral plasma membrane of both serous and mucous cells. On the microvilli of the luminal plasma membrane of the acinar cell, a small quantity of the reaction products was also present. This localization of ATPase reaction products on the serous and mucous cells seemed to coincide well with that of p-NPPase activity observed on the acini under light microscopy. Possible explanations are given regarding distribution of the above mentioned enzymes in relation to the cation transport of the plasma membrane. Structural and functional asymmetrical properties of acinar cells of the dog submandibular gland are also discussed.

Histochemical and cytochemical localization of (Na+-K+)-activated adenosine triphosphatase in the acini of dog submandibular glands.