Sodium challenge does not support an acute gastrointestinal-renal natriuretic signaling axis in humans

Richard A. Preston, David Afshartous, Leonard R. Forte, Rolando Rodco, Alberto B. Alonso, Dyal Garg, Leopoldo Raij

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

A gastrointestinal-renal natriuretic signaling axis has been proposed to regulate sodium excretion in response to acute sodium ingestion. Such an axis is thought to be regulated by a gastrointestinal sodium sensor coupled to the activation/release of a natriuretic signal and could have important clinical and scientific implications. Here we systematically tested for this putative axis and the potential involvement of the gastrointestinal-derived natriuretic prohormones prouroguanylin and proguanylin in 15 healthy volunteers. There was no difference in sodium excretion following equivalent oral or intravenous sodium loads during either high- or low-sodium diets. Furthermore, serum concentrations of prouroguanylin and proguanylin did not increase, did not differ following oral or intravenous sodium, and did not correlate with sodium excretion. Thus, our results do not support an acute gastrointestinal-renal natriuretic axis or a central role for prouroguanylin or proguanylin in humans. If such an axis does exist, it is not characterized by a significant difference in the pattern of sodium excretion following either an oral or intravenous sodium load.

Original languageEnglish (US)
Pages (from-to)1313-1320
Number of pages8
JournalKidney international
Volume82
Issue number12
DOIs
StatePublished - Dec 2 2012

Keywords

  • GI-renal signaling
  • proguanylin
  • prouroguanylin
  • sodium
  • sodium balance
  • sodium sensitivity

ASJC Scopus subject areas

  • Nephrology

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