RGD Reference Report - Acute alcohol intoxication enhances myocardial eIF4G phosphorylation despite reducing mTOR signaling. - Rat Genome Database

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Acute alcohol intoxication enhances myocardial eIF4G phosphorylation despite reducing mTOR signaling.

Authors: Vary, TC  Deiter, G  Goodman, SA 
Citation: Vary TC, etal., Am J Physiol Heart Circ Physiol. 2005 Jan;288(1):H121-8. Epub 2004 Sep 23.
RGD ID: 2307418
Pubmed: PMID:15388509   (View Abstract at PubMed)
DOI: DOI:10.1152/ajpheart.00440.2004   (Journal Full-text)

Acute alcohol intoxication impairs myocardial protein synthesis in rats, secondary to a diminished mRNA translational efficiency. Decreased mRNA translational efficiency occurs through altered regulation of peptide chain initiation. The purpose of the present set of experiments was to determine whether acute alcohol intoxication alters the phosphorylation state of eukaryotic initiation factor (eIF) 4G, eIF4G.eIF4E complex formation, and the mammalian target of rapamycin (mTOR) signaling pathway in the heart. Acute alcohol intoxication was induced by injection of alcohol (75 mmol/kg body wt ip). Control animals received an equal volume of saline. Alcohol administration enhanced phosphorylation of eIF4G (Ser(1108)) approximately threefold. Alcohol administration lowered formation of the active eIF4G.eIF4E complex by >90%, whereas it increased the abundance of the inactive 4E-binding protein 1 (4E-BP1).eIF4E complex by approximately 160%. Phosphorylation of mTOR on Ser(2448) and Ser(2481) was decreased by 50%. Reduced mTOR phosphorylation did not result from decreased phosphorylation of PKB. Phosphorylation of 4E-BP1 and S6 kinase 1 (Thr(389)), downstream targets of mTOR, were also reduced after acute alcohol administration. These data suggest that acute alcohol-induced impairments in myocardial mRNA translation initiation result, in part, from marked decreases in eIF4G.eIF4E complex formation, which appear to be independent of changes in phosphorylation of eIF4G but dependent on mTOR.



Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Eif4g1Ratlung development  IEP  RGD 
MtorRatprotein autophosphorylation  IMP  RGD 
Eif4ebp1Ratresponse to ethanol  IEP  RGD 
Eif4g1Ratresponse to ethanol  IEP  RGD 

Molecular Function

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
MtorRatprotein serine/threonine kinase activity  IMP  RGD 

Objects Annotated

Genes (Rattus norvegicus)
Eif4ebp1  (eukaryotic translation initiation factor 4E binding protein 1)
Eif4g1  (eukaryotic translation initiation factor 4 gamma 1)
Mtor  (mechanistic target of rapamycin kinase)

Objects referenced in this article
Gene Eif4e eukaryotic translation initiation factor 4E Rattus norvegicus

Additional Information