Acid Hydrolases in the Suckling Rat Small Intestine. II. On the Importance of Alkaline Phosphatase Inhibition in the Histochemical Localization of Acid Phosphatase Activity

Overview

Journal Histochem J

Specialty Biochemistry

Date 1975 Mar 1

PMID 236269

Citations 9

Authors

M J Connock

A P Sturdee

Affiliations

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Abstract

Phosphatase activities against beta-glycerophosphate, I-naphthyl phosphate and naphthol AS-TR phosphate were investigated, at acid and aldaline pH levels, using unfixed and fixed cryostat sections of suckling rat jejunum. The use of 10 mm EDTA and 10 mm NaF as inhibitors indicated that alkaline phosphate is predominantly located in the microvillous region of the adsorptive cells, while acid phosphatase is located in small particles distributed between the brush borders and the nuclei of these cells. Alkaline phosphatase activity was found to interfere with the localization of acid phosphatase unless EDTA was included in the incubation medium. A modified Gomori medium, containing 10 mm EDTA and additional lead nitrate, is described. Latency experiemtns using this medium, with unfixed sections, indicated the lysosomal nature of particulate acid phosphatase. The discussion stresses the importance of including an aldaline phosphatase inhibitor in incubation media designed to localize extralysosomal acid phosphatase activity.

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