As our bodies grow, cells proliferate to form tissues, and cells frequently have to be repaired or replaced throughout life. But the genome can also become less stable over time, or may pick up mutations that can lead to disease; these and other processes can cause cells to enter a state in which they stop dividing, known as senescence. Senescent cells become more common as we age. There also tends to be more inflammation as we age, but the link between increasing instability in the genome and inflammation is not well understood. Now scientists have reported a direct connection between DNA instability and inflammation in senescent cells. The findings have been reported in Nature Communications.

“In addition to no longer growing and proliferating, the other hallmark of senescent cells is that they have this inflammatory program causing them to secrete inflammatory molecules,” noted senior study author Peter Adams, Ph.D., director and professor of the Cancer Genome and Epigenetics Program at Sanford Burnham Prebys.