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Developmental arrest of Caenorhabditis elegans BRAP-2 mutant exposed to oxidative stress is dependent on BRC-1.

J Biol Chem. 2010 Apr 30;285(18):13437-43. Epub 2010 Mar 05
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摘要


Oxidative damage by reactive oxygen species is believed to be a contributor to the development of cancer and the physiological deterioration associated with aging. In this report, we describe the effect of reactive oxygen species exposure to a developing Caenorhabditis elegans organism containing a deletion in the homolog of BRCA1-associated protein 2 (BRAP-2). A mutant containing a deletion of brap-2 was highly sensitive to oxidizing conditions and demonstrated early larval arrest and lethality at low concentrations of the oxidative stress-inducing drug paraquat compared with the wild-type. This developmental arrest occurred early in the L1 stage and was dependent specifically on the function of the C. elegans ortholog of BRCA-1 tumor suppressor brc-1. We also show that developmental arrest in brap-2 mutants when exposed to oxidative stress was due to enhanced expression levels of the cell cycle inhibitor cki-1, and this increase in the expression levels of cki-1 requires brc-1 in brap-2 mutant animals. Our findings demonstrate that BRAP-2 is necessary for preventing an inappropriate response to elevated levels of reactive oxygen species by countering premature activation of BRC-1 and CKI-1.

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