Fragile regulatory T cells driven by diet and gut microbes raise checkpoint blockade toxicity risk

Immune checkpoint blockade can trigger immune-related adverse events, and a Cell study published on 22 October 2026 traces part of that risk to lifestyle. Dietary and microbial alterations can promote IFN-γ-driven fragility in regulatory T cells and cytotoxic tissue-resident T cell responses, increasing susceptibility to these toxicities. Working in models, the researchers showed that selectively disrupting IFN-γ signaling in regulatory T cells restored tissue homeostasis and reduced adverse events without compromising antitumor immunity. The findings position regulatory T cell stability as a potential therapeutic strategy for limiting checkpoint blockade toxicity. Still open is how these mechanisms translate to patients, including which dietary or microbial factors carry the most clinical weight and how a Treg-stabilizing intervention could be developed and tested.

Written by a model from the reports · updated 3 hours ago