Prodh2 inhibition alleviates muscle atrophy and restores strength in COPD mice
TNF-alpha triggers a mitochondrial immune pathway via Prodh2 that damages myoblasts, while silencing the enzyme restores muscle strength in mice.
Aging cell · 1 Oct · Chen G, Shangguan Z, Gong J et al.
In a study examining sarcopenic COPD patients and mouse models, researchers found that the mitochondrial enzyme Prodh2 mediates inflammation-driven muscle wasting. Prodh2 was significantly elevated in both patients and diseased mice. In myoblasts, the inflammatory cytokine TNF-α stimulated Prodh2 transcription through a p53-dependent pathway. Elevated Prodh2 provoked excess mitochondrial reactive oxygen species, triggering the release of mitochondrial DNA into the cytosol. This cytosolic DNA activated the cGAS/STING innate immune pathway, resulting in myoblast apoptosis, proliferation arrest, and cellular atrophy. Knocking down Prodh2 reversed these defects in vitro. Moreover, muscle-specific knockdown of Prodh2 in mice reduced muscle atrophy and restored muscle strength, establishing a metabolic-immune mechanism connecting chronic inflammation to sarcopenia.
Why it matters
Chronic inflammation and sarcopenia are central contributors to physical decline in aging and chronic disease. Targeting mitochondrial-immune signaling axes could offer therapeutic strategies to prevent muscle deterioration during prolonged inflammatory states.
Caveats
Functional recovery was established using genetic knockdown in animal models and cell cultures, and the abstract provides no testing of pharmacological interventions or clinical trial data.
The paper
Prodh2-Mediated Mitochondrial Stress Drives TNF-α-Induced Myoblast Dysfunction and Sarcopenia in COPD
Chen G, Shangguan Z, Gong J et al.
Aging cell
doi.org/10.1111/acel.70739