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The anti-cancer agent guttiferone-A permeabilizes mitochondrial membrane: ensuing energetic and oxidative stress

Gilberto L Pardo-Andreu1, Yanier Nuñez-Figueredo, Valeria G Tudella

  • 1Centro de Estudio para las Investigaciones y Evaluaciones Biológicas, Instituto de Farmacia y Alimentos, Universidad de La Habana, Ave. 23 # 21425 e/214 and 222, La Coronela, La Lisa, CP 13600, Ciudad Habana, Cuba. gilbertopardo@infomed.sld.cu

Toxicology and Applied Pharmacology
|May 10, 2011
PubMed

Insights

Guttiferone-A (GA) causes cancer cell death by damaging mitochondria, leading to energy depletion and reactive oxygen species (ROS) production. These mitochondrial effects explain GA's anti-cancer properties.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Guttiferone-A (GA), a natural benzophenone, exhibits cytotoxic and anti-tumor effects.
  • Mitochondria play a crucial role in cellular energy production and apoptosis.

Purpose of the Study:

  • To investigate the role of mitochondria in Guttiferone-A-induced cancer cell toxicity.
  • To elucidate the mechanism of Guttiferone-A action at the mitochondrial level.

Main Methods:

  • Experiments were conducted using hepatic carcinoma (HepG2) cells and isolated rat liver mitochondria.
  • Assessed cellular viability, mitochondrial membrane potential, ATP levels, reactive oxygen species (ROS) production, and mitochondrial membrane permeability.
  • Utilized succinate as an energy substrate and isocitrate for NAD(P)H regeneration.

Main Results:

  • Guttiferone-A decreased HepG2 cell viability, dissipated mitochondrial membrane potential, depleted ATP, and increased ROS.
  • In isolated mitochondria, GA increased membrane fluidity, induced permeabilization, caused uncoupling, and promoted Ca²⁺ efflux, ATP/NAD(P)H depletion, and ROS generation.
  • Isocitrate partially prevented most GA-induced effects, suggesting NAD(P)H's protective role.

Conclusions:

  • Guttiferone-A initiates toxicity by permeabilizing mitochondrial membranes, leading to a cascade of damaging events including potential dissipation, NAD(P)H oxidation, ROS accumulation, and ATP depletion.
  • These mitochondrial disruptions are key to Guttiferone-A's cytotoxic action and potential anti-cancer efficacy.

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