PERK and GCN2 contribute to eIF2alpha phosphorylation and cell cycle arrest after activation of the unfolded protein response pathway

Mol Biol Cell. 2005 Dec;16(12):5493-501. doi: 10.1091/mbc.e05-03-0268. Epub 2005 Sep 21.

Abstract

Exposure of cells to endoplasmic reticulum (ER) stress leads to activation of PKR-like ER kinase (PERK), eukaryotic translation initiation factor 2alpha (eIF2alpha) phosphorylation, repression of cyclin D1 translation, and subsequent cell cycle arrest in G1 phase. However, whether PERK is solely responsible for regulating cyclin D1 accumulation after unfolded protein response pathway (UPR) activation has not been assessed. Herein, we demonstrate that repression of cyclin D1 translation after UPR activation occurs independently of PERK, but it remains dependent on eIF2alpha phosphorylation. Although phosphorylation of eIF2alpha in PERK-/- fibroblasts is attenuated in comparison with wild-type fibroblasts, it is not eliminated. The residual eIF2alpha phosphorylation correlates with the kinetics of cyclin D1 loss, suggesting that another eIF2alpha kinase functions in the absence of PERK. In cells harboring targeted deletion of both PERK and GCN2, cyclin D1 loss is attenuated, suggesting GCN2 functions as the redundant kinase. Consistent with these results, cyclin D1 translation is also stabilized in cells expressing a nonphosphorylatable allele of eIF2alpha; in contrast, repression of global protein translation still occurs in these cells, highlighting a high degree of specificity in transcripts targeted for translation inhibition by phosphorylated eIF2alpha. Our results demonstrate that PERK and GCN2 function to cooperatively regulate eIF2alpha phosphorylation and cyclin D1 translation after UPR activation.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Cycle / physiology*
  • Cell Line
  • Cyclin D1 / genetics
  • Cyclin D1 / metabolism
  • Endoplasmic Reticulum / physiology
  • Eukaryotic Initiation Factor-2 / metabolism*
  • Flow Cytometry
  • Mice
  • Mice, Knockout
  • Mice, Transgenic
  • Phosphorylation
  • Protein Biosynthesis
  • Protein Denaturation
  • Protein Kinases / metabolism*
  • Protein Serine-Threonine Kinases
  • Reverse Transcriptase Polymerase Chain Reaction
  • eIF-2 Kinase / deficiency
  • eIF-2 Kinase / genetics
  • eIF-2 Kinase / metabolism*

Substances

  • Eukaryotic Initiation Factor-2
  • Cyclin D1
  • Protein Kinases
  • Eif2ak4 protein, mouse
  • PERK kinase
  • Protein Serine-Threonine Kinases
  • eIF-2 Kinase