Increased renal dopamine and acute renal adaptation to a high-phosphate diet.

Published

Journal Article

The current experiments explore the role of dopamine in facilitating the acute increase in renal phosphate excretion in response to a high-phosphate diet. Compared with a low-phosphate (0.1%) diet for 24 h, mice fed a high-phosphate (1.2%) diet had significantly higher rates of phosphate excretion in the urine associated with a two- to threefold increase in the dopamine content of the kidney and in the urinary excretion of dopamine. Animals fed a high-phosphate diet had a significant increase in the abundance and activity of renal DOPA (l-dihydroxyphenylalanine) decarboxylase and significant reductions in renalase, monoamine oxidase A, and monoamine oxidase B. The activity of protein kinase A and protein kinase C, markers of activation of renal dopamine receptors, were significantly higher in animals fed a high-phosphate vs. a low-phosphate diet. Treatment of rats with carbidopa, an inhibitor of DOPA decarboxylase, impaired adaptation to a high-phosphate diet. These experiments indicate that the rapid adaptation to a high-phosphate diet involves alterations in key enzymes involved in dopamine synthesis and degradation, resulting in increased renal dopamine content and activation of the signaling cascade used by dopamine to inhibit the renal tubular reabsorption of phosphate.

Full Text

Duke Authors

Cited Authors

  • Weinman, EJ; Biswas, R; Steplock, D; Wang, P; Lau, Y-S; Desir, GV; Shenolikar, S

Published Date

  • May 2011

Published In

Volume / Issue

  • 300 / 5

Start / End Page

  • F1123 - F1129

PubMed ID

  • 21325500

Pubmed Central ID

  • 21325500

Electronic International Standard Serial Number (EISSN)

  • 1522-1466

Digital Object Identifier (DOI)

  • 10.1152/ajprenal.00744.2010

Language

  • eng

Conference Location

  • United States