How senescent cells drive age-related inflammation through DNA export

Senescent cells accumulating in aged tissues generate a destructive inflammatory profile known as SASP that progressively impairs tissue function. Researchers have now pinpointed the mechanism: three-stranded RNA-DNA structures called R-loops export from the cell nucleus into the cytoplasm, where they activate the cGAS-STING innate immune pathway—a cellular alarm system meant to detect displaced DNA. These R-loops accumulate particularly in alpha-satellite repeats and localize within cytoplasmic chromatin fragments that amplify inflammatory signaling. The exportin-1 (XPO1)-DDX1 helicase complex governs this nuclear export; when blocked with KPT-330, senescent inflammation attenuates, age-associated inflammation declines, and healthspan extends. For the longevity-focused reader, this represents a concrete pharmacological target: interrupting this molecular trafficking could become a strategy to rejuvenate the inflammatory microenvironment of aging itself.