Transcription factor BHLHE40 expression in group 3 innate lymphoid cells and RORγt⁺ antigen-presenting cells coordinates intestinal immunity.

BHLHE40 orchestrates intestinal immunity by regulating ILC3s and RORγt⁺ APCs, crucial for mucosal defense and tolerance, with a 40-fold increase in expression during inflammation.

• Why it matters: Understanding how immune cells coordinate to balance pathogen defense and tolerance is vital for treating intestinal diseases. The mechanisms controlling this balance remain unclear, limiting therapeutic development.
• What they did: The study used conditional deletion models to investigate BHLHE40's role in ILC3s and RORγt⁺ APCs, revealing its regulation of cytokine programs, chromatin accessibility, and Treg generation.
• The result: Findings show BHLHE40 enhances barrier immunity by promoting cytokine expression and Treg induction, enabling targeted strategies to modulate intestinal immune responses.