MNKs act as a regulatory switch for eIF4E1 and eIF4E3 driven mRNA translation in DLBCL

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

Published on: May 1, 2020

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Ari L Landon1, Parameswary A Muniandy2, Amol C Shetty3

  • 1Marlene &Stewart Greenebaum Cancer Center, Department of Medicine, University of Maryland, Baltimore, Maryland 21201, USA.

Nature Communications
|November 19, 2014
PubMed

Insights

This study reveals how MNK kinases regulate oncogenic translation in diffuse large B-cell lymphoma (DLBCL). MNK inhibition impacts eIF4E1 and eIF4E3 levels, affecting cancer cell survival.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • The MNK-eIF4E axis, involving MNK1/2 kinases and eIF4E proteins, is crucial for oncogenic mRNA translation and cancer progression.
  • Understanding this axis in specific lymphoma subtypes like diffuse large B-cell lymphoma (DLBCL) is essential for targeted therapies.

Purpose of the Study:

  • To investigate the role and regulation of the MNK-eIF4E axis in germinal center B-cell (GCB) and activated B-cell (ABC) subtypes of DLBCL.
  • To elucidate the functional interplay between MNK1, MNK2, eIF4E1, and eIF4E3 in DLBCL pathogenesis.

Main Methods:

  • Differential expression analysis of MNK1 and MNK2 in GCB and ABC DLBCL subtypes.
  • Assessment of MNK inhibition effects on eIF4E1 phosphorylation, eIF4E3 expression, and total eIF4E1 protein levels.
  • Analysis of eIF4E1 mRNA polysomal loading and translation initiation using translatome profiling.

Main Results:

  • MNK1 and MNK2 exhibit distinct distributions in GCB and ABC DLBCL subtypes but functionally complement each other for cell survival.
  • MNK inhibition abrogates eIF4E1 phosphorylation, increases eIF4E3 expression, and reduces total eIF4E1 protein by affecting polysomal loading.
  • Enhanced eIF4E3 expression modulates eIF4E1 translation and reveals a novel role for eIF4E3 in translation initiation.

Conclusions:

  • The MNK-eIF4E axis plays a significant role in DLBCL, with MNKs modulating oncogenic translation through regulation of eIF4E1 and eIF4E3.
  • Targeting MNKs could represent a therapeutic strategy for DLBCL by disrupting key translation pathways essential for cancer cell survival.

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