Study tests stiffness-driven epigenetic aging

This proposed study asks whether the stiffening tissue around aging human lung fibroblasts can push their biological-age reading across a sudden threshold rather than nudge it gradually. Researchers will grow aged fibroblasts, cells that build connective tissue, for 14 days on collagen gels spanning eight calibrated stiffnesses, from 0.2 to 40 kilopascals, with six replicates per level. DNA-methylation clocks, tests that estimate biological age from chemical tags on DNA, will track each condition. A jump of at least three clock-years between neighboring stiffnesses, plus a Davies breakpoint test with p<0.01, would support a discrete state transition. A smooth curve would support continuous mechanical coupling and a graded intervention strategy.