CFTR, a protein typically studied for its ion channel function, operates through a secondary mechanism to prevent cardiomyocyte senescence by reducing mitochondrial oxidative stress. The USP45 enzyme stabilizes CFTR through deubiquitination, which enhances calcium regulation and protects heart cells from age-related dysfunction implicated in atrial fibrillation and cardiovascular disease.
Key Points
- CFTR stabilization by USP45 reduces oxidative stress in aging heart cells
- CFTR downregulation correlates with senescence markers in atrial fibrillation patients
- CFTR enhances calcium-regulatory protein PMCA to prevent mitochondrial damage
Longevity Analysis
Cardiomyocyte senescence is a direct driver of cardiovascular disease progression, and this research identifies a specific molecular brake on that process independent of CFTR's canonical ion-conducting role. The USP45-CFTR interaction represents a targetable pathway for slowing cellular aging in cardiac tissue—not by adding stress or stimulation, but by stabilizing a protein that manages the calcium and oxidative environment that determines whether heart cells remain functional or enter senescence. This distinction matters for intervention design: therapies could focus on preventing CFTR degradation rather than forcing channel activity, potentially offering a more physiologically aligned approach to age-related cardiac decline.
Original published by Wiley Aging Cell, by Chun Chen, Longtan Jiang, Yuewen Qiu, Chong Liu, Xiao Long, Pengcui Wu, Liang Li, Haixia Xu, Ping Deng, Li Yang, Qiao Jin .