Aging theory links cellular damage to self-amplifying signals

Biologists have long known that damage accumulates in cells and tissues. They also know that some aging processes appear to continue as a runaway extension of early developmental programs. A new theoretical framework, discussed on Fight Aging!, combines these two views into an integrated model. The core idea: initial cellular damage is the starting point, but the body then amplifies that damage through a network of signals passing between cells.

Damage plus amplification exceeds the sum of parts

The proposed model distinguishes between the damage load (how many damaged molecules and cells are present) and what the authors call the gain: how strongly the cell-to-cell communication network spreads and amplifies that damage. Together, these two factors are proposed to explain why the risk of death rises exponentially with age, a pattern known as the Gompertz law. System-wide treatments, such as therapies involving the exchange of blood proteins, might work in this model by reducing the gain rather than just repairing direct damage. The temporary biological rejuvenation seen in early embryos also fits this framework as a reset of the amplification system.

Theory, not yet proof

The authors are explicit that this is a theoretical proposal. The model integrates existing findings in a novel way but has not been experimentally tested as a whole.

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