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Isoflavone ME-344 Disrupts Redox Homeostasis and Mitochondrial Function by Targeting Heme Oxygenase 1

Leilei Zhang1, Jie Zhang1, Zhiwei Ye1

  • 1Department of Cell and Molecular Pharmacology and Experimental Therapeutics, Medical University of South Carolina, Charleston, South Carolina.

Cancer Research
|June 23, 2019
PubMed

Insights

The anticancer drug ME-344 targets heme oxygenase 1 (HO-1), disrupting cancer cell redox balance and mitochondrial function. This mechanism contributes to its effectiveness and supports its clinical development for cancer treatment.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • ME-344 is a novel isoflavone derivative with demonstrated cytotoxic properties.
  • Its mechanism of action and specific molecular targets in cancer, particularly lung cancer, require elucidation.
  • Understanding ME-344's interaction with cellular pathways is crucial for optimizing its therapeutic potential.

Purpose of the Study:

  • To identify the molecular targets of ME-344 that mediate its anticancer activity.
  • To investigate the role of heme oxygenase 1 (HO-1) in ME-344's cytotoxic effects.
  • To explore the impact of ME-344 on cellular redox homeostasis and mitochondrial function.

Main Methods:

  • Utilized drug-sensitive and drug-resistant lung cancer cell lines.
  • Assessed drug-induced apoptosis, reactive oxygen species (ROS) levels, and nuclear erythroid factor 2-like 2 (Nrf2) signaling.
  • Employed surface plasmon resonance, clickable chemical probes, and proteomic analyses to confirm ME-344 binding to HO-1.
  • Examined ME-344's effect on HO-1 translocation and mitochondrial protein expression.

Main Results:

  • ME-344 induced apoptosis, increased ROS, and activated Nrf2 signaling in sensitive cells.
  • ME-344 directly inhibited HO-1 activity and altered its structure, promoting translocation to mitochondria in sensitive cells.
  • HO-1 was confirmed as a direct binding target of ME-344.
  • ME-344 affected mitochondrial proteins, including voltage-dependent anion-selective channels, impacting cellular redox and mitochondrial function.
  • Elevated Nrf2 and HO-1 levels were observed in human lung cancer biopsies compared to normal tissues.

Conclusions:

  • ME-344 exerts its anticancer effects by inhibiting HO-1 and disrupting its mitochondrial localization.
  • The drug interferes with tumor cell redox homeostasis and mitochondrial function, contributing to its therapeutic index.
  • These findings validate HO-1 as a target for ME-344 and support its continued clinical investigation.

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