Arginine’s Impact on Immunity and Disease

A study from Rockefeller University reveals that the amino acid arginine, found in protein-rich foods and supplements, might have a greater influence on battling cancer and viral infections than previously thought. Researchers discovered that low arginine levels hinder the production of a protein vital for immune detection of cancer and viruses, allowing these threats to evade the immune system.

Research Findings

Sohail Tavazoie, leading the Elizabeth and Vincent Meyer Laboratory of Systems Cancer Biology, explains that low arginine levels are common in cancers and viral infections. Arginine levels naturally decrease with age, which affects the production of MHC-1, a protein crucial for signaling the immune system about abnormal proteins in cells.

By supplementing arginine, the study showed improved outcomes for flu and COVID-19. Mice benefitted from better influenza results even with delayed arginine administration. This reflects an equivalent intake of roughly 10 grams of arginine daily, the approximate dosage of typical supplement tablets.

Arginine and Immune Function

Arginine supports cells in protein creation, vital for numerous biological processes. While produced by the body, it is also abundant in protein-rich foods. Historically, low arginine levels have been associated with diseases like colon cancer.

Building on previous findings linking arginine deprivation to increased mutations in colon cancer cells, Tavazoie’s team explored how such fluctuations might alter gene expression. Their research, focusing on colon cancer, influenza, and SARS-CoV-2 models, identified 414 proteins at diminished levels when arginine was scarce. Among these were three genes crucial for MHC-1 production.

MHC-1 proteins, located on cell surfaces, display abnormal proteins to T cells, prompting an immune response. For MHC-1 assembly, significant arginine is required. The study demonstrated that low arginine led to production stalling, resulting in inadequate immune system alerts.

Diet’s Influence on Disease

In mice, arginine-rich diets correlated with fewer colon tumors and milder infections, while arginine-poor diets exacerbated flu, COVID-19, and tumor growth. Published findings in Cell suggest dietary arginine deficiency may worsen disease outcomes, though more studies and clinical trials are necessary.

Tavazoie suggests that the age-related decline in arginine might partly account for the increased risk of colon cancer and severe flu or COVID-19 in older populations. His team is now focused on examining whether arginine supplementation could benefit flu patients at higher risk of severe illness.

Reference:
Tavazoie, S. F., et al. (2026). Dietary arginine drives codon-dependent MHC class I translation and improves immunity in colon tumorigenesis and respiratory viral infection. Cell.