RGD Reference Report - Phosphorylation of eukaryotic initiation factor eIF2Bepsilon in skeletal muscle during sepsis. - Rat Genome Database

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Phosphorylation of eukaryotic initiation factor eIF2Bepsilon in skeletal muscle during sepsis.

Authors: Vary, TC  Deiter, G  Kimball, SR 
Citation: Vary TC, etal., Am J Physiol Endocrinol Metab. 2002 Nov;283(5):E1032-9.
RGD ID: 11041880
Pubmed: PMID:12376332   (View Abstract at PubMed)
DOI: DOI:10.1152/ajpendo.00171.2002   (Journal Full-text)

We reported that the inhibition of protein synthesis in skeletal muscle during sepsis correlated with reduced eukaryotic initiation factor eIF2B activity. The present studies define changes in eIF2Bepsilon phosphorylation in gastrocnemius of septic animals. eIF2B kinase activity was significantly elevated 175% by sepsis compared with sterile inflammation, whereas eIF2B phosphatase activity was unaffected. Phosphorylation of eIF2Bepsilon-Ser(535) was significantly augmented over 2-fold and 2.5-fold after 3 and 5 days and returned to control values after 10 days of sepsis. Phosphorylation of glycogen synthase kinase-3 (GSK-3), a potential upstream kinase responsible for the elevated phosphorylation of eIF2Bepsilon, was significantly reduced over 36 and 41% after 3 and 5 days and returned to control values after 10 days of sepsis. The phosphorylation of PKB, a kinase thought to directly phosphorylate and inactivate GSK-3, was significantly reduced approximately 50% on day 3, but not on days 5 or 10, postinfection compared with controls. Treatment of septic rats with TNF-binding protein prevented the sepsis-induced changes in eIF2Bepsilon and GSK-3 phosphorylation, implicating TNF in mediating the effects of sepsis. Thus increased phosphorylation of eIF2Bepsilon via activation of GSK-3 is an important mechanism to account for the inhibition of skeletal muscle protein synthesis during sepsis. Furthermore, the study presents the first demonstration of changes in eIF2Bepsilon phosphorylation in vivo.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
Sepsis  ISOEif2b5 (Rattus norvegicus)11041880; 11041880protein:increased serine phosphorylation:gastrocnemiusRGD 
Sepsis  IDA 11041880protein:increased serine phosphorylation:gastrocnemiusRGD 

Objects Annotated

Genes (Rattus norvegicus)
Eif2b5  (eukaryotic translation initiation factor 2B subunit epsilon)

Genes (Mus musculus)
Eif2b5  (eukaryotic translation initiation factor 2B, subunit 5 epsilon)

Genes (Homo sapiens)
EIF2B5  (eukaryotic translation initiation factor 2B subunit epsilon)


Additional Information