Experiment tests cell–matrix synchrony

This proposed study asks whether skin cells from older people can reset their DNA-age signal, an estimate based on chemical marks on DNA, before the material around them becomes younger too. Researchers would switch on OCT4, SOX2 and KLF4, three reprogramming factors, in fibroblasts, skin-supporting cells, from donors aged 65-75. Over 28 days, matched samples every 48 hours would measure DNA age and the ratio of fibronectin to laminin, two proteins released into the extracellular matrix, the material around cells. A lag longer than seven days, with matrix change slower than DNA-age change, would define a temporary aged niche around rejuvenated cells. That window could guide when to add treatments aimed at the surrounding matrix. Rapid matching would indicate little time for sequential treatment.