Modified fibronectin renews senescence

A proposed mechanism asks whether ageing-related damage can restart after senescent cells, growth-arrested cells, are removed. Fibronectin, a protein scaffold outside cells, may retain a chemical mark that seeds renewed senescence. Deamidation, a change in a protein side chain, may convert its NGR sequence into isoDGR, changing binding to integrins, cell-surface receptors that turn attachment into signals. A future test would mask isoDGR while matching matrix stiffness, relaxation and ordinary attachment sites. If recurrence changed only with accessible isoDGR, it would support ligand chemistry as a contributor. The altered site and its accessibility need direct confirmation.