From gatekeepers to regenerators: the plasticity of Paneth cells.

Reactive oxygen species and CDC42 regulate Paneth cell identity, enabling their transition from secretory cells to regenerative contributors in the small intestine.

• Why it matters: Understanding how Paneth cells adapt their roles is crucial for developing therapies for intestinal injuries and diseases, addressing gaps in knowledge about cellular plasticity and regeneration.
• What they did: Yang et al. used molecular and cellular approaches to identify ROS as key determinants of Paneth cell identity and demonstrated CDC42's role in modulating ROS balance and cell plasticity.
• The result: The findings reveal that manipulating ROS and CDC42 pathways could enhance intestinal regeneration, offering potential strategies for treating intestinal damage and improving mucosal healing.