Base excision repair AP endonucleases and mismatch repair act together to induce checkpoint-mediated autophagy.
Base excision repair AP endonucleases and mismatch repair act together to induce checkpoint-mediated autophagy.
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DOI:
10.1038/ncomms3674
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发表时间:
2013
影响因子:
16.6
通讯作者:
Nilsen, Hilde
中科院分区:
文献类型:
--
作者:
SenGupta, Tanima;Torgersen, Maria Lyngaas;Kassahun, Henok;Vellai, Tibor;Simonsen, Anne;Nilsen, Hilde
Cellular responses to DNA damage involve distinct DNA repair pathways, such as mismatch repair (MMR) and base excision repair (BER). Using Caenorhabditis elegans as a model system, we present genetic and molecular evidence of a mechanistic link between processing of DNA damage and activation of autophagy. Here we show that the BER AP endonucleases APN-1 and EXO-3 function in the same pathway as MMR, to elicit DNA-directed toxicity in response to 5-fluorouracil, a mainstay of systemic adjuvant treatment of solid cancers. Immunohistochemical analyses suggest that EXO-3 generates the DNA nicks required for MMR activation. Processing of DNA damage via this pathway, in which both BER and MMR enzymes are required, leads to induction of autophagy in C. elegans and human cells. Hence, our data show that MMR- and AP endonuclease-dependent processing of 5-fluorouracil-induced DNA damage leads to checkpoint activation and induction of autophagy, whose hyperactivation contributes to cell death. The chemotherapeutic drug 5-fluorouracil causes cell toxicity by inducing DNA lesions. Here, SenGupta et al. use C. elegans to show that components of the base excision repair and the mismatch repair pathways function together in the response to 5-fluorouracil, resulting in activation of the DNA damage checkpoint and induction of autophagy.
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作者:
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通讯作者:
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Nilsen, Hilde