Interaction of atrial natriuretic peptide and ouabain in the myocardium

Maoz Nesher, Yan Bai, Daxiang Li, Haim Rosen, David Lichtstein, Lijun Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Natriuretic peptides and digitalis-like compounds serve as regulators of homeostasis, including control of volume expansion and blood pressure. The aim of the present study was to explore possible interactions between atrial natriuretic peptide (ANP) and ouabain in the heart. ANP (1 nmol/L) had no effect in papillary muscle preparations from guinea pigs. Ouabain (1 μmol/L) induced positive inotropic effect. The addition of ANP prior to ouabain resulted in a significant decrease in the ouabain-induced positive inotropic effect, manifested as an attenuated increase in twitch maximal upward force slope and resting muscular tension. In addition, ANP caused an increase in Na+-K+-ATPase activity in heart microsomal preparations. The effect of ouabain on Na+-K+-ATPase activity was shown in a biphasic manner. Ouabain (0.01-1 nmol/L) had a small but significant increase on pump activity, but higher doses of ouabain inhibited activity. ANP attenuated ouabain- induced Na+-K+-ATPase activity. Furthermore, ouabain (50 nmol/L) or ANP (10 nmol/L) alone induced Akt activation in cardiomyocytes. However, ANP blocked ouabain-induced Akt activation. These results point to the existence of interactions between ANP and ouabain on Na+-K+-ATPase signaling and function in the heart, which may be mediated by regulation of Na+-K+-ATPase activity and (or) signal transduction mechanisms.

Original languageAmerican English
Pages (from-to)1386-1393
Number of pages8
JournalCanadian Journal of Physiology and Pharmacology
Volume90
Issue number10
DOIs
StatePublished - Jun 2012

Keywords

  • Akt
  • Heart
  • K-ATPase
  • Na
  • Natriuretic peptides
  • Ouabain

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