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Pyruvate kinase M2 (PKM2) is not essential for tumor initiation but critical for tumor growth and maintenance by promoting angiogenesis and metabolic addiction. Targeting the PKM2-STAT3-HIF1α/VEGF axis may be a viable bladder cancer therapy.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Pyruvate kinase M2 (PKM2) traditionally linked to tumorigenesis via Warburg effect.
  • Contradictory studies show PKM2 absence can accelerate, not inhibit, tumor growth.
  • Most human tumors overexpress PKM2, necessitating clarification of its role.

Purpose of the Study:

  • Investigate the precise role of PKM2 in oncogenic HRAS-driven urothelial carcinoma.
  • Elucidate the molecular mechanisms by which PKM2 influences tumor initiation, growth, and maintenance.
  • Assess the therapeutic potential of targeting PKM2 in bladder cancer.

Main Methods:

  • PKM2 knockout in HRAS-driven mouse urothelial carcinoma models.
  • Pharmacologic inhibition of PKM2.
  • Analysis of PKM2-STAT3 complex formation, nuclear translocation, and downstream signaling (HIF1α, VEGF).
  • Assessment of angiogenesis, autophagy, and apoptosis.
  • Inducible PKM2 overexpression studies in various stages of urothelial hyperplasia.
  • Analysis of PKM2 expression in human bladder cancer tissues.

Main Results:

  • PKM2 ablation or inhibition did not affect tumor initiation but impaired tumor growth and maintenance.
  • Reduced PKM2 levels decreased PKM2-STAT3 complex formation, nuclear translocation, and HIF1α/VEGF-related angiogenesis.
  • PKM2 absence correlated with decreased autophagy and increased apoptosis.
  • PKM2 overexpression accelerated tumorigenesis in established hyperplastic lesions.
  • PKM2 is overexpressed in human bladder cancers.

Conclusions:

  • PKM2 is dispensable for tumor initiation but essential for tumor growth and maintenance.
  • PKM2 promotes tumor progression by enhancing angiogenesis and metabolic addiction via the PKM2-STAT3-HIF1α/VEGF axis.
  • The PKM2-STAT3 pathway represents a promising therapeutic target for bladder cancer.