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Regulation of arsenic trioxide-induced cellular responses by Mnk1 and Mnk2

Blazej Dolniak1, Efstratios Katsoulidis, Nathalie Carayol

  • 1Robert H. Lurie Comprehensive Cancer Center and Division of Hematology-Oncology, Department of Medicine, Northwestern University Medical School, Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois 60611, USA.

The Journal of Biological Chemistry
|February 27, 2008
PubMed

Insights

Arsenic trioxide activates MAPK signal-integrating kinases (Mnks) 1 and 2, which negatively regulate its cancer-killing effects. Inhibiting Mnk kinases enhances arsenic trioxide

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Signaling

Background:

  • Arsenic trioxide (As(2)O(3)) induces apoptosis in malignant cells, but its precise mechanisms remain unclear.
  • Understanding As(2)O(3) signaling pathways is crucial for developing targeted leukemia therapies.

Purpose of the Study:

  • To elucidate the role of MAPK signal-integrating kinases (Mnks) 1 and 2 in arsenic trioxide-induced apoptosis.
  • To investigate the upstream regulation of Mnk activation by the p38 MAPK pathway.

Main Methods:

  • Utilized leukemia cell lines with targeted gene disruptions for p38alpha MAPK, Mnk1, and Mnk2.
  • Assessed Mnk activation and downstream substrate phosphorylation (eIF4E at Ser-209) following As(2)O(3) treatment.
  • Examined the impact of Mnk disruption and pharmacological inhibition on As(2)O(3)-induced apoptosis in primary leukemic progenitors.

Main Results:

  • As(2)O(3) activates Mnk1 and Mnk2 in a p38 MAPK-dependent manner.
  • Activated Mnks phosphorylate eukaryotic initiation factor 4E (eIF4E) at Ser-209.
  • Disruption of Mnk genes enhances As(2)O(3)-induced apoptosis, indicating a negative feedback role for Mnks.

Conclusions:

  • Mnk kinases act as negative regulators of As(2)O(3)-induced apoptosis and antileukemic responses.
  • Pharmacological inhibition of Mnk activity potentiates As(2)O(3)'s therapeutic effects on acute leukemia cells.
  • Targeting the Mnk pathway offers a potential strategy to improve As(2)O(3) efficacy in cancer treatment.

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