Stress granule clearance mediated by V-ATPase-interacting protein NCOA7 mitigates ovarian aging.

Summary

This mechanistic study shows that NCOA7 enables autophagic clearance of stress granules (granulophagy) in granulosa cells via interaction with the G3BP1–V-ATPase complex, mitigating oxidative stress–driven ovarian aging. Genetic loss of NCOA7 accelerates ovarian senescence and fecundity decline, whereas rapamycin or LNP-mRNA delivery of NCOA7 rescues granulophagy and delays ovarian aging.

Key Findings

• NCOA7 expression is decreased and deleterious variants are identified in ovarian aging contexts; NCOA7 deletion accelerates ovarian senescence and fecundity decline in mice.
• NCOA7 partitions into G3BP1–V-ATPase-containing stress granules and promotes autophagic degradation (granulophagy).
• Rapamycin or LNP-mRNA delivery of NCOA7 enhances stress granule clearance, alleviates granulosa cell senescence, and delays ovarian aging in vivo.
• Defines stress granule clearance as a therapeutic axis for ovarian resilience to stress.

Clinical Implications

While preclinical, strategies that enhance granulophagy (e.g., mTOR modulation or NCOA7 restoration) could form the basis of future trials to preserve ovarian function, extend reproductive longevity, or optimize ART outcomes in women with accelerated ovarian aging.

Limitations

• Preclinical models; translational efficacy and safety in humans remain unproven.
• Exact dosing, timing, and long-term effects of granulophagy modulation require clinical evaluation.

Future Directions

First-in-human biomarker-driven trials of granulophagy enhancers (e.g., mTOR modulators) or NCOA7-based therapeutics in women at risk of accelerated ovarian aging; development of imaging and molecular biomarkers of granulosa cell stress granules.