Senescent cells export abnormal RNA structures (R-loops) through a nuclear transport mechanism involving DDX1 and XPO1 proteins, triggering chronic inflammation via the cGAS-STING pathway. Blocking this export pathway reduces inflammaging and extends healthspan in aging models.
Key Points
- R-loop export through DDX1-XPO1 complex drives senescence-associated inflammation
- cGAS-STING pathway activation links nuclear dysfunction to systemic aging
- XPO1 inhibition blocks inflammation cascade and improves longevity metrics
Longevity Analysis
This mechanism reveals how cellular senescence propagates systemic inflammation—a central driver of age-related disease. Rather than targeting senescent cells directly, blocking the specific export pathway that amplifies their inflammatory signals offers a distinct intervention point. The finding suggests that age-related inflammation originates partly from nuclear dysfunction and aberrant nucleic acid detection, not merely from accumulated senescent burden. Therapeutic inhibition of this pathway could reduce the cascade of inflammatory signaling that accelerates multiple organ systems without requiring wholesale elimination of senescent cells.
Original published by Nature Aging, by Xue Hao.