New research has identified specific plant-derived seed storage proteins as key drivers of oral tolerance. This process, where the immune system learns to accept harmless food components, is vital for preventing conditions like food allergies.
Scientists discovered that specialized immune cells, regulatory T cells (Treg cells) in the gut, recognize these proteins. Prominent targets include proteins from staple crops like maize, wheat, and soy. Notably, the maize seed storage protein alpha-zein was identified as a primary antigen.
Further experiments confirmed that alpha-zein-specific Treg cells suppress immune responses, demonstrating their role in maintaining oral tolerance. This suggests that dietary exposure to these proteins early in life shapes how the immune system handles food.
While the study was conducted in mice, these findings could inform future strategies to prevent food allergies and other immune-mediated gastrointestinal diseases in humans. Understanding these dietary triggers is a significant step toward harnessing the body's natural tolerance mechanisms.