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A Model of Chronic Nutrient Infusion in the Rat

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Published on: August 14, 2013

Chronic ethanol feeding impairs AMPK and MEF2 expression and is associated with GLUT4 decrease in rat myocardium.

LiYong Chen¹, FuRong Wang, XiangLan Sun

¹Shandong Provincial Hospital Affiliated to Shandong University, Shandong 250021, China.

Experimental & Molecular Medicine

|February 19, 2010

Summary

Chronic alcohol consumption impairs heart insulin sensitivity by reducing AMP-activated protein kinase (AMPK) and myocyte enhancer factor 2 (MEF2) expression, leading to decreased glucose transporter 4 (GLUT4) levels.

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Area of Science:

Cardiovascular Science
Metabolic Research
Toxicology

Background:

Chronic and heavy alcohol consumption is a known risk factor for heart disease.
The specific impact of ethanol on myocardial insulin sensitivity remains incompletely understood.

Purpose of the Study:

To investigate the effects of ethanol on the expression of key regulators of insulin sensitivity in the myocardium: AMP-activated protein kinase (AMPK), myocyte enhancer factor 2 (MEF2), and glucose transporter 4 (GLUT4).

Main Methods:

In vivo studies involving rats treated with ethanol or AICAR.
In vitro experiments using primary neonatal rat cardiomyocytes exposed to ethanol or AICAR.
Analysis of cardiac protein and mRNA expression (AMPK, MEF2, GLUT4) via Western blotting and RT-PCR.
Assessment of serum TNF-alpha levels using ELISA.

Main Results:

Chronic ethanol exposure induced insulin resistance in the myocardium.
Ethanol significantly decreased mRNA and protein levels of AMPKalpha subunits and MEF2 (isoforms A and D) in a dose-dependent manner.
Ethanol inhibited GLUT4 expression, with correlations observed between phospho-AMPKalpha and MEF2, and between MEF2 and GLUT4.
Elevated serum TNF-alpha levels were noted following ethanol exposure.

Conclusions:

Chronic ethanol consumption negatively impacts myocardial insulin sensitivity.
Ethanol reduces the expression of AMPKalpha and MEF2, which is associated with a decline in GLUT4 levels in the rat myocardium.
These molecular changes likely contribute to alcohol-induced heart dysfunction and insulin resistance.