Aging impairs macrophage phagocytosis through mitochondrial oxidative stress that drives excessive collagen production, which physically inhibits the cytoskeletal dynamics required for immune clearance. Restoring mitochondrial redox balance reverses this dysfunction, directly supporting immune defense in aging organisms.
Key Points
- Aged macrophages show reduced phagocytic capacity versus young cells
- Mitochondrial ROS drives collagen overproduction that binds F-actin
- Mitochondrial antioxidant MitoTEMPO restores phagocytic function
Longevity Analysis
Immune competence declines with age, and this research identifies a specific mechanistic barrier: mitochondrial oxidative stress disrupts the structural dynamics required for pathogen clearance. Rather than treating aging as inevitable immune failure, the pathway shows that restoring mitochondrial redox balance and controlling collagen accumulation can restore functional capacity. This points to a correctable constraint—not a system-wide collapse—suggesting that targeted interventions on mitochondrial function may sustain defense capacity well into later life.
Original published by Wiley Aging Cell, by Yuming Wang, Xin Xu, Nuanqin Shen, Ping Han, Liuyi Wu, Yi Jin, Yiming Sun, Lanlan Xiao, Jinyou Li, Lan Wang, Yunmei Yang, Qin Zhang, Weiqian Chen, Chaohui Yu, Bowen Wu .