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The Human Transient Receptor Potential Melastatin 2 Ion Channel Modulates ROS Through Nrf2

Lei Bao1, Fernanda Festa1,2, Christopher S Freet1

  • 1Departments of Pediatrics, The Pennsylvania State University College of Medicine, P.O. Box 850, Hershey, Pennsylvania, 17033, USA.

Scientific Reports
|October 3, 2019
PubMed

Insights

Transient receptor potential melastatin channel subfamily member 2 (TRPM2) protects cells from oxidative stress by regulating antioxidant pathways. TRPM2

Area of Science:

  • Cell Biology
  • Oxidative Stress Research
  • Cancer Biology

Background:

  • Transient receptor potential melastatin channel subfamily member 2 (TRPM2) is crucial for cell survival under oxidative stress.
  • TRPM2 is highly expressed in cancer cells, suggesting a role in tumorigenesis.
  • TRPM2 inhibition leads to mitochondrial dysfunction, increased reactive oxygen species (ROS), and reduced cell viability.

Purpose of the Study:

  • To investigate the role of NF-E2-related factor (Nrf2) in TRPM2-mediated suppression of oxidative stress.
  • To elucidate the molecular mechanisms by which TRPM2 protects cells from oxidative damage.

Main Methods:

  • TRPM2 depletion and reconstitution experiments.
  • Analysis of antioxidant cofactors (glutathione, NADPH, NADH) and energy metabolites (ATP, GTP).
  • Assessment of Nrf2 and IQGAP1 expression and localization.
  • Measurement of ROS levels and cell viability.

Main Results:

  • TRPM2 depletion significantly reduced antioxidant cofactors, Nrf2/IQGAP1 expression, and transcription of Nrf2-regulated antioxidant enzymes.
  • The glutamine pathway for glutathione production and cellular ATP/GTP levels were suppressed.
  • Reconstitution with wild-type TRPM2 or Nrf2 restored enzyme expression and cofactor levels, with TRPM2 fully rescuing cell viability and Nrf2 partially rescuing it.

Conclusions:

  • TRPM2 maintains cell survival during oxidative stress by modulating Nrf2-dependent antioxidant pathways and cofactors.
  • TRPM2's function is linked to maintaining cellular redox balance and energy homeostasis.
  • Targeting TRPM2 or Nrf2 pathways may offer therapeutic strategies for cancers associated with oxidative stress.

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