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AMPK and PFKFB3 mediate glycolysis and survival in response to mitophagy during mitotic arrest

Elena Doménech1, Carolina Maestre1, Lorena Esteban-Martínez2

  • 1Cell Division and Cancer Group, Spanish National Cancer Research Centre (CNIO), Madrid 28029, Spain.

Nature Cell Biology
|September 1, 2015
PubMed

Insights

Cancer cells survive prolonged mitotic arrest by switching to glycolysis, driven by AMPK and PFKFB3. Targeting this metabolic adaptation enhances anti-cancer drug efficacy.

Area of Science:

  • Cell Biology
  • Cancer Metabolism
  • Molecular Oncology

Background:

  • Blocking mitotic progression is a cancer therapy strategy, but cancer cell survival during mitotic arrest is poorly understood.
  • The energetic demands of mitosis are significant, yet the metabolic adaptations enabling survival remain unclear.

Purpose of the Study:

  • To investigate the metabolic mechanisms underlying cancer cell survival during prolonged mitotic arrest.
  • To explore the role of mitochondria, ATP levels, and key metabolic regulators in mitotic arrest survival.
  • To assess the therapeutic potential of targeting metabolic pathways in combination with anti-mitotic drugs.

Main Methods:

  • Utilized cell culture models of prolonged mitotic arrest.
  • Assessed mitochondrial content, ATP levels, and AMPK activation.
  • Investigated the role of PFKFB3 phosphorylation and translational regulation.
  • Examined the effects of autophagy induction, AMPK inhibition, and PFKFB3 inhibition on cell death and drug efficacy.

Main Results:

  • Prolonged mitotic arrest leads to mitophagy-dependent mitochondrial loss, reduced ATP, and AMPK activation.
  • AMPK activation promotes glycolysis via PFKFB3 phosphorylation and increased protein production.
  • Induction of autophagy or inhibition of AMPK/PFKFB3 enhances mitotic cell death.
  • Targeting these metabolic pathways improves the anti-tumoral efficacy of microtubule poisons in breast cancer cells.

Conclusions:

  • Cancer cell survival during mitotic arrest is critically dependent on metabolic adaptation, specifically a shift towards glycolysis.
  • Targeting the metabolic vulnerabilities of mitotic-arrested cancer cells, such as AMPK/PFKFB3 signaling and autophagy, represents a promising therapeutic strategy.
  • Combining anti-mitotic therapies with metabolic interventions could overcome resistance and improve treatment outcomes in breast cancer and potentially other malignancies.

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