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- W2032352562 abstract "Phosphate deprivation causes a resistance to the phosphaturic effect of parathyroid hormone (PTH). The present study determined whether acute phosphate deprivation alters basal or stimulated activities of key enzymes of the cyclic adenosine monophosphate (cAMP) metabolism in microdissected proximal convoluted and proximal straight tubules, since blunted cAMP levels in these proximal subsegments might account for refractoriness to the effect of PTH on phosphate reabsorption in the proximal convoluted and proximal straight tubule segments. In the proximal convoluted tubules of rats fed a normal-phosphate diet (NPD), PTH increased the adenylate cyclase activity by tenfold. In the proximal convoluted tubule of rats fed a low-phosphate diet (LPD), PTH also increased the adenylate cyclase activity by tenfold. In addition, forskolin increased the adenylate cyclase activity to levels similar to PTH in the proximal convoluted tubule of rats fed NPD or LPD. In the proximal straight tubule of rats fed NPD, PTH resulted in an approximately fivefold increase in adenylate cyclase activity. In the proximal straight tubule of rats fed LPD, PTH resulted in a fourfold increase in adenylate cyclase activity. The forskolin-stimulated adenylate cyclase activity was markedly decreased (46%) in the proximal straight tubule of phosphate-deprived rats. The cAMP-phosphodiesterase activity in the proximal convoluted tubule was significantly increased by 26% in phosphate-deprived rats. The cAMP-phosphodiesterase activities in the proximal straight tubules from rats fed NPD or LPD were similar. We conclude that distinct differences in key enzymes of cAMP metabolism exist in the proximal convoluted and proximal straight tubule subsegments. Further, phosphate deprivation affects the cAMP-phosphodiesterase and adenylate cyclase activities differently in these nephron subsegments.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2032352562 date "1990-01-01" @default.
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- W2032352562 title "Effect of Phosphate Deprivation on Enzymes of the Cyclic Adenosine Monophosphate Metabolism in Rat Proximal Convoluted and Proximal Straight Tubules" @default.
- W2032352562 doi "https://doi.org/10.1159/000173365" @default.
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