Cardiac norepinephrine transporter protein expression is inversely correlated to chamber norepinephrine content

Erica A. Wehrwein, Lindsay M. Parker, Anna A. Wright, John M. Spitsbergen, Martin Novotny, Dagmar Babankova, Greg M. Swain, Beth Habecker, David L. Kreulen

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The cardiac neuronal norepinephrine (NE) transporter (NET) in sympathetic neurons is responsible for uptake of released NE from the neuroeffector junction. The purpose of this study was to assess the chamber distribution of cardiac NET protein measured using [3H]nisoxetine binding in rat heart membranes and to correlate NE content to NET amount. In whole mounts of atria, NET was colocalized in nerve fibers with tyrosine hydroxylase (TH) immunoreactivity. NE content expressed as micrograms NE per gram tissue was lowest in the ventricles; however, NET binding was significantly higher in the left ventricle than the right ventricle and atria (P <0.05), resulting in a significant negative correlation (r2 = 0.922; P <0.05) of NET to NE content. The neurotoxin 6-hydroxydopamine, an NET substrate, reduced NE content more in the ventricles than the atria, demonstrating functional significance of high ventricular NET binding. In summary, there is a ventricular predominance of NET binding that corresponds to a high NE reuptake capacity in the ventricles, yet negatively correlates to tissue NE content.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume295
Issue number3
DOIs
StatePublished - Sep 2008

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Norepinephrine Plasma Membrane Transport Proteins
Norepinephrine
nisoxetine
Heart Ventricles
Neuroeffector Junction
Oxidopamine
Neurotoxins
Tyrosine 3-Monooxygenase
Heart Atria
Nerve Fibers
Neurons
Membranes

Keywords

  • 6-hydroxydopamine
  • Noradrenaline
  • Reuptake
  • Stellate ganglia

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

Cardiac norepinephrine transporter protein expression is inversely correlated to chamber norepinephrine content. / Wehrwein, Erica A.; Parker, Lindsay M.; Wright, Anna A.; Spitsbergen, John M.; Novotny, Martin; Babankova, Dagmar; Swain, Greg M.; Habecker, Beth; Kreulen, David L.

In: American Journal of Physiology - Regulatory Integrative and Comparative Physiology, Vol. 295, No. 3, 09.2008.

Research output: Contribution to journalArticle

Wehrwein, Erica A. ; Parker, Lindsay M. ; Wright, Anna A. ; Spitsbergen, John M. ; Novotny, Martin ; Babankova, Dagmar ; Swain, Greg M. ; Habecker, Beth ; Kreulen, David L. / Cardiac norepinephrine transporter protein expression is inversely correlated to chamber norepinephrine content. In: American Journal of Physiology - Regulatory Integrative and Comparative Physiology. 2008 ; Vol. 295, No. 3.
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