Percentage of senescent cells

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Here are a two facts and an assumption: Fact 1: Senescent cells accumulate with age...evidence is overwhelming that the percentage of senescent cells (by beta-galactosidase staining) increases in tissues of older creatures

Fact 2: Inflammation associated with the increased number of senescent cells as we age is causing tissue damage, loss of tissue function, and ultimately "aging"

Assumption: Senescent cells express and secrete cytokines that promote the recruitment of immune cells, which then cause inflammation, part of the mechanism by which the senescent cell is removed so that other newer, younger, healthier cells can replace it.

QUESTION: If inflammation is supposed to be removing senescent cells, and inflammation is causing tissue damage that leads to aging, why are we seeing more senescent cells in older tissue? I would have expected that a robust inflammatory response would have eliminated the accumulated senescent cells and thus I would not see an increase---what do you think?

Reference no: EM132817028

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