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Related Experiment Videos

Chronic alcohol feeding impairs hepatic translation initiation by modulating eIF2 and eIF4E.

C H Lang1, D Wu, R A Frost

  • 1Department of Cellular Physiology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033, USA. clang@psu.edu

The American Journal of Physiology
|November 24, 1999
PubMed
Summary

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Chronic alcohol consumption impairs liver protein synthesis by disrupting translation initiation. Key factors affected include eukaryotic initiation factor 2B (eIF2B) activity and eukaryotic initiation factor 4F (eIF4F) function, impacting protein production.

Area of Science:

  • Hepatology
  • Molecular Biology
  • Biochemistry

Background:

  • Chronic alcohol consumption is linked to liver damage and impaired protein synthesis.
  • Understanding the molecular mechanisms behind alcohol-induced inhibition of protein synthesis is crucial for developing targeted interventions.

Purpose of the Study:

  • To investigate the cellular mechanisms underlying protein synthesis inhibition in the liver following chronic alcohol exposure.
  • To identify specific molecular targets, particularly eukaryotic initiation factors (eIFs), affected by alcohol.

Main Methods:

  • Rats were fed an alcohol-containing diet for 14 weeks, with isocaloric controls.
  • Assessed hepatic ATP, RNA content, ribosomal subunit distribution, and the activity/content/phosphorylation of key eukaryotic initiation factors (eIF2B, eIF2Bepsilon, eIF2alpha, eIF4E, 4E-BP1, eIF4G).

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Main Results:

  • Chronic alcohol consumption did not alter hepatic ATP or total RNA content but decreased translational efficiency.
  • Alcohol increased non-polysome-associated ribosomal subunits and impaired translation initiation by reducing eIF2B activity and altering eIF4F function.
  • Specifically, alcohol increased eIF4E bound to 4E-BP1 and decreased eIF4G binding to eIF4E.

Conclusions:

  • Chronic alcohol intake impairs liver protein synthesis initiation through dysregulation of eIF2B activity and eIF4F complex function.
  • Altered eIF4E availability and binding dynamics contribute to alcohol-induced translational inhibition in the liver.