Related Experiment Video

Updated: Aug 7, 2026

Rapid Quantification of Oxidized and Reduced Forms of Glutathione Using Ortho -phthalaldehyde in Cultured Mammalian Cells In Vitro
03:35

Rapid Quantification of Oxidized and Reduced Forms of Glutathione Using Ortho -phthalaldehyde in Cultured Mammalian Cells In Vitro

Published on: June 28, 2024

Flavonoid-induced glutathione depletion: potential implications for cancer treatment

Remy Kachadourian1, Brian J Day

  • 1Department of Medicine, National Jewish Medical and Research Center, Denver, CO 80206, USA.

Free Radical Biology & Medicine
|June 20, 2006
PubMed

Insights

Certain flavonoids deplete glutathione (GSH) in human tumor cells, enhancing the toxicity of prooxidants. This suggests potential roles for flavonoids in cancer therapy by targeting mitochondrial dysfunction.

Area of Science:

  • Biochemistry
  • Pharmacology
  • Cancer Biology

Background:

  • Flavonoids are plant-derived compounds with diverse biological activities.
  • Glutathione (GSH) is a critical intracellular antioxidant.
  • Tumor cells often exhibit altered redox homeostasis, making them potential targets for GSH-depleting agents.

Purpose of the Study:

  • To investigate the ability of various flavonoids to deplete intracellular glutathione (GSH) in different human cancer cell lines.
  • To determine if these flavonoids can potentiate the cytotoxicity of prooxidant agents.
  • To elucidate the mechanisms underlying flavonoid-induced potentiation of cytotoxicity, focusing on mitochondrial function.

Main Methods:

  • Exposure of A549 (lung), HL-60 (myeloid), and PC-3 (prostate) human tumor cells to various flavonoids at 25 microM.
  • Measurement of intracellular GSH levels at 4 h and 24 h.
  • Assessment of flavonoid-induced potentiation of cytotoxicity of prooxidants (etoposide, rotenone, 2-methoxyestradiol, curcumin).
  • Evaluation of mitochondrial GSH, membrane potential, and cytochrome c release.

Main Results:

  • Hydroxychalcones and dihydroxychalcones effectively depleted GSH in A549 and HL-60 cells.
  • Flavones chrysin and apigenin were most effective in PC-3 cells for GSH depletion.
  • Prototypic flavonoids (2',5'-DHC and chrysin) potentiated the cytotoxicity of certain prooxidants.
  • Potentiation effects were linked to mitochondrial dysfunction, including altered GSH levels, membrane potential, and cytochrome c release.

Conclusions:

  • Specific flavonoids can effectively deplete GSH in various human tumor cells.
  • Flavonoids can enhance the efficacy of prooxidant cancer therapies.
  • The observed potentiation involves the induction of mitochondrial dysfunction, highlighting a potential therapeutic strategy.

Related Concept Videos

Cancer Prevention02:59

Cancer Prevention

Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
Some...
Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase01:11

Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase

Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...
Cancer Therapies02:49

Cancer Therapies

Cancer therapies are various modes of treatment, such as surgery, radiation therapy, and chemotherapy that are administered to cancer patients.
However, cancer treatments can pose several challenges, as therapies used to kill cancer cells are generally also toxic to normal cells. Moreover, cancer cells mutate rapidly and can develop resistance to chemical agents or radiation therapy. Besides, all types of cancer cells may not respond to the same therapy. Some cancer cells respond to one...
Cancer Therapies02:49

Cancer Therapies

Cancer therapies are various modes of treatment, such as surgery, radiation therapy, and chemotherapy that are administered to cancer patients.
However, cancer treatments can pose several challenges, as therapies used to kill cancer cells are generally also toxic to normal cells. Moreover, cancer cells mutate rapidly and can develop resistance to chemical agents or radiation therapy. Besides, all types of cancer cells may not respond to the same therapy. Some cancer cells respond to one...
Combination Therapies and Personalized Medicine02:50

Combination Therapies and Personalized Medicine

Combining two or more treatment methods increases the life span of cancer patients while reducing damage to vital organs or tissue from the overuse of a single treatment. Combination therapy also targets different cancer-inducing pathways, thus reducing the chances of developing resistance to treatment.
The combination of the drug acetazolamide and sulforaphane is a good example of combination therapy to treat cancer. The cells in the interior of a large tumor often die due to the hypoxic and...
Targeted Cancer Therapies02:57

Targeted Cancer Therapies

The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
There are several types of targeted therapies against specific...