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Cellular senescence is a phenomenon characterized by the cessation of ... Progeroid syndromes are all examples of aging diseases where cell senescence appears to be ...
Senescence (/ s ɪ ˈ n ɛ s ə n s /) or biological aging is the gradual deterioration of functional characteristics in living organisms. Whole organism senescence involves an increase in death rates or a decrease in fecundity with increasing age, at least in the later part of an organism's life cycle.
Senescence can be induced by several factors, including telomere shortening, [37] DNA damage [38] and stress. Since the immune system is programmed to seek out and eliminate senescent cells, [39] it might be that senescence is one way for the body to rid itself of cells damaged beyond repair. The links between cell senescence and aging are several:
Aging of the immune system is a controversial phenomenon. Senescence refers to replicative senescence from cell biology , which describes the condition when the upper limit of cell divisions ( Hayflick limit ) has been exceeded, and such cells commit apoptosis or lose their functional properties.
Senotherapeutic's refers to therapeutic agents/strategies that specifically target cellular senescence. [1] Senotherapeutic's include emerging senolytic/senoptotic small molecules that specifically induce cell death in senescent cells [2] and agents that inhibit the pro-inflammatory senescent secretome. [3]
Extending telomeres can allow cells to divide more and increase the risk of uncontrolled cell growth and cancer development. [24] A study conducted by Johns Hopkins University challenged the idea that long telomeres prevent aging. Rather than protecting cells from aging, long telomeres help cells with age-related mutations last longer. [13]
One of the main criticisms of the free radical theory of aging is directed at the suggestion that free radicals are responsible for the damage of biomolecules, thus being a major reason for cellular senescence and organismal aging. [26]: 81 Several modifications have been proposed to integrate current research into the overall theory.
1977 To explain aging, Thomas Kirkwood proposed the disposable soma theory. According to the theory, the organism has only a limited amount of resources that it has to allocate between different purposes (such as growth, reproduction, repair of damage). Aging occurs due to the limitation of resources that the body can afford to spend on repair. [4]