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Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells
08:47

Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells

Published on: May 1, 2020

Dissecting eIF4E action in tumorigenesis

Hans-Guido Wendel1, Ricardo L A Silva, Abba Malina

  • 1Cancer Biology and Genetics Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA. wendelh@mskcc.org

Genes & Development
|December 7, 2007
PubMed

Insights

The translation initiation factor eIF4E drives cancer by activating translation and suppressing apoptosis. Targeting this oncogenic activity, particularly through its kinase MNK1, offers a potential therapeutic strategy for cancer treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • Genetically engineered mouse models are crucial for cancer gene research and therapeutic target validation.
  • The translation initiation factor eIF4E has been identified as a potent oncogene in vivo.

Purpose of the Study:

  • To investigate the correlation between eIF4E's oncogenic activity and its translational control functions.
  • To explore the role of MNK1, a kinase for eIF4E, in tumorigenesis.
  • To identify therapeutic targets within the eIF4E-mediated translational control pathway.

Main Methods:

  • Utilized a previously established mouse lymphoma model.
  • Assessed the phosphorylation of eIF4E on Ser 209 and its correlation with oncogenic activity.
  • Investigated the effects of constitutively active and dominant-negative MNK1 mutants on tumor cell proliferation.
  • Examined the role of the anti-apoptotic protein Mcl-1 as a downstream target.

Main Results:

  • The oncogenic activity of eIF4E in vivo is linked to its translation-activating function and Ser 209 phosphorylation.
  • Activated MNK1 promotes tumorigenesis similarly to eIF4E.
  • A dominant-negative MNK1 mutant suppressed tumor cell proliferation.
  • Phosphorylated eIF4E and MNK1 contribute to tumor formation by suppressing apoptosis, partly through regulating Mcl-1.

Conclusions:

  • eIF4E contributes to tumorigenesis by enhancing translation and suppressing apoptosis.
  • MNK1 plays a significant role in eIF4E-driven tumorigenesis.
  • Translational control mediated by eIF4E and MNK1 represents a potential therapeutic intervention point for cancer.

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