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- W2022353228 abstract "Gene-disruption studies involving poly(ADP-ribose) polymerase (Parp) have identified the various roles of Parp in cellular responses to DNA damage. The partial rescue of V[D]J recombination process in SCID/Parp(-/-) double mutant mice indicates the participation of Parp in the repair of DNA strand break. Parp(-/-) mice are more sensitive to the lethal effects of alkylating agents. Parp is also thought to be involved in base-excision repair after DNA damage caused by alkylating agents. On the other hand, resistance of Parp(-/-) mice to DNA damage induced by reactive oxygen species implicates the contribution of Parp to cell death through NAD depletion. Parp(-/-) mice with two different genetic backgrounds also show enhanced sensitivity to the lethal effects of gamma-irradiation. Parp(-/-) mice show more severe villous atrophy of the small intestine compared to the wild-type counterpart in a genetic background of 129Sv/C57BL6. Other forms of enhanced tissue damage have been identified in Parp(-/-) mice with a genetic background of 129Sv/ICR. For example, Parp(-/-) mice exhibit extensive hemorrhage in the glandular stomach and other tissues, such as the testes, after gamma-irradiation. Severe myelosuppression is also observed in both Parp(+/+) and Parp(-/-) mice, but Parp(+/+) mice show extensive extramedullary hematopoiesis in the spleen during the recovery phase of post-irradiation, whereas the spleen of Parp(-/-) mice exhibits severe atrophy with no extramedullary hematopoiesis. The absence of extramedullary hematopoiesis in the spleen is probably the underlying mechanism of hemorrhagic tendency in various tissues of Parp(-/-) mice. These findings suggest that loss of Parp activity could contribute to post-irradiation tissue hemorrhage." @default.
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- W2022353228 date "2000-04-01" @default.
- W2022353228 modified "2023-10-07" @default.
- W2022353228 title "The response of Parp knockout mice against DNA damaging agents" @default.
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- W2022353228 doi "https://doi.org/10.1016/s1383-5742(00)00033-8" @default.
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