ArticleMolecular and cellular biochemistry2004
Streptozotocin-induced diabetes influences the activity of ecto-nucleoside triphosphate diphosphohydrolase 1 of rat osseous plate membranes.
Article in Molecular and cellular biochemistry, 2004. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
We report the kinetic characterization of an ecto-nucleosidetriphosphate diphosphohydrolase 1 from rat osseous plate membranes in streptozotocin-induced diabetic rats, which arises during ectopic mineralization twenty days after a subcutaneous implantation of demineralized bone matrix, Insulin deficiency decreased the ecto-nucleoside triphosphate diphosphohydrolase activity from 1293.1 +/- 39.8 (control rats) to 556.0 +/- 8.2 nmol Pi/(min mg). Two families of ATP hydrolyzing sites showed cooperative effects with specific activities of 256.2 +/- 7.7 nmol Pi/(min mg) and 299.8 +/- 8.9 nmol Pi/(min mg), and studies on the stimulation of the enzyme by magnesium and calcium ions showed that the decrease in enzyme activity results from changes in the affinity of the enzyme for these ions. To our knowledge this is the first study associating the effects of type I diabetes with an ecto-nucleoside triphosphate diphosphohydrolase activity from rat osseous plate membranes.
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