Cancer Cells Fuel Themselves with Antioxidant Glutathione, New Research Suggests

Researchers at the Wilmot Cancer Institute at the University of Rochester have discovered that cancer cells appear to utilize the antioxidant glutathione as a fuel source. This finding, published in Nature on March 18, suggests new pathways for investigating cancer metabolism and potential drug development.

Cancer Repurposes Glutathione for Growth

Isaac Harris, PhD, and his team, including co-corresponding author Fabio Hecht, PhD, and co-first author Marco Zocchi, PhD, identified that cancer cells actively break down glutathione and use it for growth.

This is a novel understanding, as previous research primarily focused on glutathione's role in preventing or repairing cell damage, rather than its capacity to nourish tumors.

Previous research focused on glutathione's role in preventing or repairing cell damage; this new discovery highlights its capacity to nourish tumors.

Analysis of breast tumor samples from the Wilmot Biobank revealed abundant glutathione storage within tumors, confirming its consumption as a nutrient. Preclinical models of breast cancer demonstrated that blocking the cancer's ability to use glutathione successfully slowed tumor growth. Preliminary research indicates this discovery may extend to various other cancer types.

Opening New Avenues for Treatment

This research opens up new avenues for examining how cancer cells acquire nutrients and how these processes might be inhibited. The team is exploring therapies that can restrict a tumor's use of glutathione.

They have identified a drug developed nearly a decade ago and are collaborating with chemist Tom Driver, PhD, and biochemist Joshua Munger, PhD, to improve this drug and identify the specific proteins involved in glutathione metabolism within tumors.

Future plans include testing combinations of anti-cancer drugs alongside dietary modifications to enhance cancer treatment outcomes. The overarching goal is to develop targeted therapies that eliminate tumors without harming healthy cells.

Dietary Advice and Supplement Risks

While this research links glutathione to cancer, Dr. Harris emphasized that individuals should continue consuming antioxidant-rich whole foods, which contribute to a balanced diet, weight control, reduced inflammation, and a healthy immune system.

Dr. Harris cautioned against taking unregulated glutathione supplements, as high concentrations could pose risks.

This aligns with earlier findings by Jeevisha Bajaj, PhD, who discovered that the antioxidant taurine can drive leukemia cell growth.