Blocking p97 eases smoke-driven lung inflammation by restoring SIRT1 SUMOylation
- Cigarette smoke raised p97 in lung epithelial cells while lowering SIRT1 and SUMO1, alongside higher inflammatory cytokine release.
- The p97 inhibitor CB-5083 reduced senescence and restored SIRT1 stability, activity and SUMO conjugation in these cells.
- A SUMOylation inhibitor, 2-D08, cancelled the protection in cells.
- In a mouse COPD model, CB-5083 lessened alveolar damage, neutrophil infiltration and cytokines, and 2-D08 reversed the benefit.
💡 Points Based on the abstract
p97 is a pan-essential ATPase in protein quality control, and CB-5083 was pulled from oncology trials over off-target toxicity, so the safety margin is my first worry for a chronic lung disease. 2-D08 reversing the benefit is nice, but it's a blunt SUMO-pathway inhibitor; I'd want SIRT1 knockdown or a SUMO-site mutant to prove the mechanism, plus inhaled delivery to limit systemic exposure.