Post-infarct cardiac sympathetic hyperactivity regulates galanin expression

T. Jarred Ewert, Kurt R. Gritman, Michael Bader, Beth Habecker

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The neuropeptide galanin is elevated in the cardiac sympathetic innervation after myocardial infarction (MI). Galanin inhibits vagal transmission and may support the regeneration of sympathetic nerves, thereby contributing to the development of arrhythmia and sudden cardiac death after MI. The reason for increased galanin production in sympathetic neurons after myocardial infarction is not known. Cardiac sympathetic neurons are activated chronically after cardiac ischemia-reperfusion, and activation of sympathetic neurons in culture stimulates galanin expression. Therefore, we tested the hypothesis that increased sympathetic nerve activity stimulates galanin expression in cardiac sympathetic neurons after myocardial infarction. To test this hypothesis we used TGR(ASrAOGEN) transgenic rats, which lack brain angiotensinogen and do not exhibit post-infarct sympathetic hyperactivity. Hearts and stellate ganglia were collected 1 week after ischemia-reperfusion. Galanin mRNA was quantified by real-time PCR and peptide content was assayed by enzyme-linked immunosorbent assay. Galanin mRNA increased approximately 3-fold after MI in cardiac sympathetic neurons of both genotypes compared to unoperated and sham controls. Left ventricular galanin content, however, increased after MI only in Sprague-Dawley rats and not in AOGEN rats. These data suggest that post-infarct cardiac sympathetic hyperactivity stimulates galanin peptide production but is not required for increased galanin mRNA expression.

Original languageEnglish (US)
Pages (from-to)163-166
Number of pages4
JournalNeuroscience Letters
Volume436
Issue number2
DOIs
StatePublished - May 9 2008

Fingerprint

Galanin
Myocardial Infarction
Neurons
Messenger RNA
Reperfusion
Ischemia
Transgenic Rats
Stellate Ganglion
Angiotensinogen
Peptides
Nerve Regeneration
Sudden Cardiac Death
Neuropeptides
Sprague Dawley Rats
Cardiac Arrhythmias
Real-Time Polymerase Chain Reaction
Enzyme-Linked Immunosorbent Assay
Genotype

Keywords

  • Galanin
  • Myocardial infarction
  • Neuropeptide
  • Sympathetic

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Post-infarct cardiac sympathetic hyperactivity regulates galanin expression. / Ewert, T. Jarred; Gritman, Kurt R.; Bader, Michael; Habecker, Beth.

In: Neuroscience Letters, Vol. 436, No. 2, 09.05.2008, p. 163-166.

Research output: Contribution to journalArticle

Ewert, T. Jarred ; Gritman, Kurt R. ; Bader, Michael ; Habecker, Beth. / Post-infarct cardiac sympathetic hyperactivity regulates galanin expression. In: Neuroscience Letters. 2008 ; Vol. 436, No. 2. pp. 163-166.
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