Maintenance DNA methylation is required for induced Treg reparative function following viral pneumonia in mice.
Summary
Adoptive transfer of iTregs accelerated lung recovery after influenza pneumonia in mice, but this reparative effect depended on UHRF1-mediated maintenance DNA methylation. UHRF1-deficient iTregs showed poor engraftment and transcriptional instability with acquisition of effector T cell programs, indicating a mechanistic requirement for epigenetic stability.
Key Findings
- iTreg adoptive transfer promoted lung recovery after influenza pneumonia in mice.
- Loss of UHRF1-mediated maintenance DNA methylation in iTregs reduced engraftment and delayed tissue repair.
- UHRF1-deficient iTregs exhibited transcriptional instability and gained effector T cell lineage transcription factors after trafficking to injured lungs.
Clinical Implications
Stabilizing iTregs via epigenetic modulation (e.g., targeting UHRF1-dependent maintenance methylation) may enhance adoptive Treg therapies for viral pneumonia/ARDS. Timing and manufacturing protocols should preserve iTreg epigenetic identity to maintain reparative function.
Why It Matters
This study uncovers an epigenetic mechanism that stabilizes iTregs and enables lung repair, directly informing the development of cell therapies for severe viral pneumonia and ARDS.
Limitations
- Murine model limits generalizability to humans
- No human validation or long-term safety/efficacy data for iTreg therapy
Future Directions
Develop epigenetic stabilization strategies for iTregs and test efficacy, durability, and safety in large-animal models and early-phase human lung injury/ARDS studies.
Study Information
- Study Type
- Case-control
- Research Domain
- Pathophysiology
- Evidence Level
- V - Preclinical mechanistic study in mice with adoptive transfer and epigenetic profiling
- Study Design
- OTHER