Resistance to Apoptosis

Some cell types—for example, human fibroblasts, T-cells, and mammary epithelial cells—become resistant to signals that trigger apoptosis when induced to undergo cellular senescence (72,73). As discussed below, apoptosis is a response to physiological signals, stress, and damage, which eliminates superfluous, dysfunctional, or potentially malignant cells in a controlled manner. Thus, some cells, upon becoming senescent, also become resistant to stimuli that would normally eliminate them. This attribute of senescent cells may explain why they persist in vivo and accumulate with age (74-80).

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