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Acute alcohol prevents the refeeding-induced decrease in autophagy but does not alter the increased protein synthetic

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Area of Science:

  • Cardiovascular Physiology
  • Molecular Biology
  • Alcohol Metabolism

Background:

  • Ethanol (alcohol) induces anabolic resistance in skeletal muscle.
  • The effect of ethanol on cardiac protein synthesis and degradation pathways is not well understood.
  • Understanding ethanol's impact on cardiac signaling is crucial for cardiovascular health.

Purpose of the Study:

  • To investigate the impact of acute ethanol administration on cardiac signal transduction pathways.
  • To determine how ethanol affects protein synthesis and degradation in the heart during refeeding.
  • To elucidate ethanol's influence on the mechanistic target of rapamycin (mTOR) pathway and autophagy.

Main Methods:

  • Adult male mice were fasted and then refed or given ethanol prior to refeeding.
  • Cardiac tissue and blood were collected for analysis of signaling proteins and enzyme activity.
  • Key proteins involved in mTOR signaling (S6K1, eIF4E) and autophagy (ULK1, LC3B) were assessed.

Main Results:

  • Acute ethanol administration blocked the nutrient-induced increase in S6K1 phosphorylation in the heart.
  • Ethanol did not impair the refeeding-induced increase in overall cardiac protein synthesis.
  • Ethanol antagonized the refeeding-induced inhibition of autophagy, preventing key autophagic proteins from decreasing.

Conclusions:

  • Acute ethanol intake prevents the normal inhibition of cardiac autophagy after refeeding.
  • The mTOR-dependent pathway for increasing cardiac protein synthesis remains largely unaffected by acute ethanol.
  • Ethanol disrupts specific signaling related to autophagy but not the overall protein synthesis response to refeeding in the heart.