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A direct effect of aldosterone on endothelin-1 gene expression in vivo

Stephen Wong1, Francine E Brennan, Morag J Young

  • 1Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria 3800, Australia.

Endocrinology
|January 16, 2007
PubMed

Insights

Endothelin-1 (ET-1) is a direct aldosterone target gene in the kidney and colon. Aldosterone rapidly increases ET-1 mRNA levels, suggesting its role in regulating ion homeostasis.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Physiology

Background:

  • Aldosterone is a key hormone regulating sodium reabsorption in epithelial tissues like the kidney and colon.
  • This process involves mineralocorticoid receptor (MR) activation, gene induction, and increased sodium channel activity.
  • Endothelin-1 (ET-1), a vasoconstrictor, influences kidney sodium and hydrogen ion transport.

Purpose of the Study:

  • To investigate Endothelin-1 (ET-1) as a direct aldosterone-regulated target gene in vivo.
  • To determine the role of the mineralocorticoid receptor (MR) in ET-1 gene regulation by aldosterone.

Main Methods:

  • Adrenalectomized rats were administered aldosterone and/or a MR antagonist (potassium canrenoate).
  • Quantitative real-time PCR was used to measure ET-1 mRNA levels in kidney and colon tissues.
  • Time course experiments assessed the rapid induction of ET-1 mRNA following aldosterone administration.

Main Results:

  • A single dose of aldosterone increased ET-1 mRNA levels 2-fold in the kidney and colon after 1 hour.
  • Aldosterone did not significantly affect mRNA levels of related isoforms ET-2 or ET-3.
  • Co-administration of aldosterone and a MR antagonist blocked ET-1 mRNA induction, confirming MR mediation.
  • ET-1 mRNA levels peaked at 2- and 2.5-fold increases in the kidney and colon, respectively, within 1 hour.

Conclusions:

  • Endothelin-1 (ET-1) is a direct aldosterone-induced gene target in the kidney and colon.
  • The mineralocorticoid receptor (MR) mediates aldosterone's effect on ET-1 gene expression.
  • ET-1 may play a significant role in aldosterone-mediated ion homeostasis.

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