Zeaxanthin May Boost T Cells and Enhance Cancer Immunotherapy

Researchers from the University of Chicago have discovered that zeaxanthin, a plant-derived carotenoid commonly associated with eye health, may significantly enhance the immune system’s ability to fight cancer.

The study, published in Cell Reports Medicine, suggests that this widely available nutrient can strengthen the activity of immune cells and potentially increase the effectiveness of cancer immunotherapy treatments.

Zeaxanthin is found naturally in everyday vegetables, such as leafy greens, spinach, and peppers, as well as in various supplements.

Mechanisms of T-Cell Activation

The research focused on CD8+ T cells, which are a specific type of immune cell responsible for identifying and destroying tumor cells.

These cells utilize a molecular structure known as the T-cell receptor (TCR) to recognize abnormal cells. The University of Chicago team found that zeaxanthin stabilizes and strengthens the formation of the TCR complex when CD8+ T cells interact with cancer cells.

This stabilization triggers more robust intracellular signaling, which leads to several key immune responses:

• Increased T-cell activation
• Enhanced cytokine production
• Improved tumor-killing capacity

By improving these functions, zeaxanthin may act as an immune-boosting compound that complements advanced medical treatments.

Impact on Immunotherapy and Tumor Growth

The findings indicate that zeaxanthin could serve as a therapy booster for modern cancer immunotherapies, making these treatments potentially more effective.

In mouse models, the researchers observed that dietary supplementation with zeaxanthin slowed the growth of tumors.

We were surprised to find that zeaxanthin, already known for its role in eye health, has a completely new function in boosting anti-tumor immunity,

Jing Chen, PhD, Janet Davison Rowley Distinguished Service Professor of Medicine

Dr. Chen, the senior author of the study, further stated that a simple dietary nutrient could complement and strengthen advanced cancer treatments like immunotherapy.

Research Context and Next Steps

This discovery is the result of years of work by Dr. Chen’s lab to understand how various nutrients influence the immune system. The team identified zeaxanthin after screening a large blood nutrient library to find compounds that directly enhance CD8+ T cell activity.

Because zeaxanthin is found in common foods and is available as a supplement, This proves considered a safe and accessible candidate for further medical exploration.

While the results in mouse models are promising, the researchers have identified human trials as the necessary next step to verify these effects in people.