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- W2022285621 abstract "Increasing evidence indicates that postmitotic, terminally differentiated neurons activate the cell cycle before death. The purpose of this cell cycle activation, however, remains elusive. In proliferating cells, cell cycle machinery is a major contributor to the DNA damage response, which is comprised of growth arrest. In quiescent cells such as terminally differentiated neurons, cell cycle-associated events may also be part of the DNA damage response. A link between DNA damage and repair, cell cycle regulation and cell death is becoming increasingly recognized for cycling cells but remains elusive for quiescent cells. Neurons are particularly susceptible to oxidative stress due to the high rate of oxidative metabolism in the brain and the low level of antioxidant enzymes compared to other somatic tissues. This is supported by fact that the intracellular end point of many neurotoxic stimuli is oxidative stress, which also represents a major cause of the neuropathology underlying a variety of neurodegenerative diseases. DNA is perhaps the major target of oxyradicals. Thus, oxidative stress may cause DNA damage, which is countered by a complex defense mechanism, the DNA damage response, which involves not only the elimination of DNA damage, but its coordination with other cellular processes such as cell-cycle progression, together directing to preserve genomic integrity. The function of such response is the removal of DNA damage by DNA repair pathways, or the elimination of damaged cells via apoptosis. The present review discusses the idea that the cell cycle machinery is a critical element of the DNA damage response not only in cycling, but also quiescent cells, and may bear the same function: to repair the damage or initiate apoptosis if the damage is too extensive to be repaired." @default.
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- W2022285621 date "2004-06-01" @default.
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- W2022285621 title "Why do Neurons Enter the Cell Cycle?" @default.
- W2022285621 doi "https://doi.org/10.4161/cc.3.6.901" @default.
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