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Related Experiment Video

Updated: Jul 6, 2026

Location, Dissection, and Analysis of the Murine Stellate Ganglion

Location, Dissection, and Analysis of the Murine Stellate Ganglion

Published on: December 22, 2020

Post-infarct cardiac sympathetic hyperactivity regulates galanin expression.

T Jarred Ewert¹, Kurt R Gritman, Michael Bader

¹Spring Arbor University, Spring Arbor, MI 49283, USA.

Neuroscience Letters

|April 4, 2008

Summary

Following myocardial infarction (MI), increased sympathetic nerve activity stimulates galanin peptide production in cardiac sympathetic neurons. However, this hyperactivity is not required for elevated galanin mRNA expression after MI.

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Semi-Minimal Invasive Method to Induce Myocardial Infarction in Rats and the Assessment of Cardiac Function by an Isolated Working Heart System

Semi-Minimal Invasive Method to Induce Myocardial Infarction in Rats and the Assessment of Cardiac Function by an Isolated Working Heart System

Published on: June 11, 2020

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Last Updated: Jul 6, 2026

Location, Dissection, and Analysis of the Murine Stellate Ganglion

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Semi-Minimal Invasive Method to Induce Myocardial Infarction in Rats and the Assessment of Cardiac Function by an Isolated Working Heart System

Semi-Minimal Invasive Method to Induce Myocardial Infarction in Rats and the Assessment of Cardiac Function by an Isolated Working Heart System

Published on: June 11, 2020

Area of Science:

Cardiovascular Physiology
Neuroendocrinology
Molecular Cardiology

Background:

Galanin, a neuropeptide, is upregulated in cardiac sympathetic nerves post-myocardial infarction (MI).
Elevated galanin may contribute to arrhythmias and sudden cardiac death by inhibiting vagal transmission and promoting sympathetic nerve regeneration.
The precise triggers for increased galanin production in sympathetic neurons after MI remain unclear.

Purpose of the Study:

To investigate the hypothesis that heightened sympathetic nerve activity post-MI directly stimulates galanin expression in cardiac sympathetic neurons.
To differentiate the roles of sympathetic hyperactivity in galanin mRNA and peptide production after MI.

Main Methods:

Utilized TGR(ASrAOGEN) transgenic rats, which lack brain angiotensinogen and exhibit attenuated post-MI sympathetic hyperactivity.
Quantified galanin mRNA levels using real-time PCR.
Assayed cardiac galanin peptide content via enzyme-linked immunosorbent assay (ELISA).
Collected heart and stellate ganglion tissues one week after ischemia-reperfusion injury.

Main Results:

Galanin mRNA levels significantly increased (approximately 3-fold) in cardiac sympathetic neurons of both Sprague-Dawley and AOGEN rats post-MI compared to controls.
Left ventricular galanin peptide content increased post-MI exclusively in Sprague-Dawley rats, but not in AOGEN rats.
These findings indicate a dissociation between galanin mRNA and peptide responses to MI.

Conclusions:

Post-infarct cardiac sympathetic hyperactivity is a key driver of increased galanin peptide production in the heart.
While sympathetic hyperactivity influences galanin peptide levels, it is not essential for the initial rise in galanin mRNA expression following myocardial infarction.