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RIP1 maintains DNA integrity and cell proliferation by regulating PGC-1α-mediated mitochondrial oxidative

W Chen1, Q Wang2, L Bai1

  • 1Molecular Biology and Lung Cancer Program, Lovelace Respiratory Research Institute, 2425 Ridgecrest DR. SE, Albuquerque, NM, USA.

Cell Death and Differentiation
|March 4, 2014
PubMed

Insights

Receptor-interacting protein 1 (RIP1) regulates cancer cell metabolism. Loss of RIP1 impairs energy production, causing DNA damage and inhibiting proliferation, suggesting RIP1 as an anticancer target.

Area of Science:

  • Cancer Biology
  • Metabolic Regulation
  • Molecular Signaling

Background:

  • Aerobic glycolysis (Warburg effect) fuels cancer cell proliferation, but its precise regulation is unclear.
  • Receptor-interacting protein 1 (RIP1) is a known factor in cell death and survival pathways.
  • Understanding metabolic regulation is crucial for developing effective cancer therapies.

Purpose of the Study:

  • To investigate the role of RIP1 in regulating glucose metabolism and mitochondrial function in cancer cells.
  • To elucidate the downstream effects of RIP1 loss on cellular processes like DNA integrity and proliferation.
  • To explore the therapeutic potential of targeting RIP1-mediated metabolic pathways.

Main Methods:

  • Utilized lung cancer cell models with RIP1 manipulation (loss-of-function).
  • Assessed mitochondrial oxidative phosphorylation (OXPHOS) and aerobic glycolysis rates.
  • Analyzed peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α) expression.
  • Evaluated DNA damage and p53-mediated cell proliferation inhibition.

Main Results:

  • Loss of RIP1 suppressed PGC-1α expression, leading to impaired mitochondrial OXPHOS.
  • RIP1 deficiency accelerated aerobic glycolysis and induced spontaneous DNA damage.
  • Excessive glycolysis, triggered by RIP1 loss, resulted in p53-dependent cytostasis and proliferation inhibition.
  • RIP1 maintains glycolysis for cancer cell energy homeostasis and DNA integrity.

Conclusions:

  • RIP1 is a critical regulator of both mitochondrial respiration and aerobic glycolysis in cancer.
  • RIP1's role in maintaining metabolic balance is essential for cancer cell survival and proliferation.
  • Targeting RIP1's metabolic regulatory function presents a potential strategy for anticancer therapy.

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