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Gastric K+-stimulated p-nitrophenylphosphatase cytochemistry

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Summary

A cytochemical study of gastric K+-stimulated p-nitrophenylphosphatase (K-NPPase) activity, corresponding to a K+-stimulated phosphoprotein phosphatase of H-K-ATPase system, has been made by a new cytochemical method.

Sections of fixed guinea pig gastric mucosa in a mixture of 2% paraformaldehyde and 0.25% glutaraldehyde, were incubated with the incubation medium (1.0 M glycine-0.1 M KOH buffer, pH 9.0, 2.5 ml; 1.1 M KCl, 0.5 ml; 10 mM lead citrate dissolved in 50 mM KOH, 4 ml; levamisole, 6.0 mg; dimethyl sulfoxide, 2.0 ml; 0.1 M p-nitrophenylphosphate (Mg-salt), 1.0 ml; ouabain, 73.0 mg) for 30 min at room temperature. Under a light microscope the specific gastric K-NPPase reaction was distributed only in the parietal cells of the fundic glands. The electron microscopic cytochemistry showed that the gastric K-NPPase activity was localized on the membrane lining the apical surfaces, secretory canaliculi and tubulovesicles. On the other hand, ouabain-sensitive K-NPPase activity (Na-K-ATPase) was demonstrated to localize only in the basolateral membrane of parietal cells with Mayahara's method.

These findings support the interrelationships between the apical surface membrane, secretory canalicular membrane and tubulovesicles, and the functional differentiation of the membrane between the secretory membrane and basolateral membrane.

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In honour of Prof. P. van Duijn

This study was supported by Grants-in-Aid for Encouragement of Young Scientists No. 60770019 to K. Fujimoto from the Ministry of Education, Science and Culture, the Japanese Government

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Fujimoto, K., Ogawa, K.S. & Ogawa, K. Gastric K+-stimulated p-nitrophenylphosphatase cytochemistry. Histochemistry 84, 600–608 (1986). https://doi.org/10.1007/BF00482998

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