Summary
Two methods to determine fructose-1,6-diphosphatase activity histochemically were tested on liver, intestine, skeletal muscle and heart of rats. Using lead ions to precipitate inorganic phosphate, according to Wachstein and Meisel, the addition of the specific inhibitor adenosine monophosphate caused an increase of phosphate precipitation. Therefore this method is often not suitable. A coupled assay, used to detect fructose-6-phosphate formed after conversion to glucose-6-phosphate (which in its turn may reduce tetrazolium dyes in the glucose-6-phosphate dehydrogenase reaction), was found to be satisfactory in liver to demonstrate specific fructose-1,6-diphosphatase activity, since adenosine monophosphate was strongly inhibitory. In intestine acid- and alkaline phosphatases, however, were found to interfere. In the latter organ, added adenosine monophosphate itself strongly stimulates formazan formation, which is probably due to high xanthine oxidase activity.
In muscle, where a high aldolase activity is present, monoiodoacetate must be included in the incubation medium. Since fructose-1,6-diphosphatase activity in muscle is low compared with that of liver, the results obtained with muscle are often difficult to interpret.
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de Pijper, A.M. Histochemical studies of fructose-1,6-diphosphatase in various tissues of the rat. Histochemie 37, 197–206 (1973). https://doi.org/10.1007/BF00304181
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DOI: https://doi.org/10.1007/BF00304181