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• W2148689968 abstract "Abstract The indole-3-carbinol (I3C) metabolite 3,3′-diindolylmethane (DIM) is a proposed cancer prevention agent for various tumor types, including breast cancer. Here, we show that DIM up-regulates expression of the tumor suppressor protein BRCA1 in carcinoma and normal cell types. Up-regulation of BRCA1 was dose and time dependent, and it was observed at physiologically relevant micromolar and submicromolar DIM concentrations when cells were exposed for 72 hours. Treatment with the parent compound (I3C) or DIM (1 μmol/L) protected against cell killing due to H2O2 and other oxidants, and the protection was abrogated by knockdown of BRCA1. DIM stimulated signaling by the antioxidant transcription factor NFE2L2 (NRF2) through the antioxidant response element in a BRCA1-dependent manner. We further showed that DIM rapidly stimulated phosphorylation of BRCA1 on Ser 1387 and Ser 1524 and that these phosphorylations are required for protection against oxidative stress. DIM-induced phosphorylation of BRCA1 on Ser 1387 was dependent on ataxia-telangiectasia mutated. Finally, in our assay systems, H2O2-induced cell death was not due to apoptosis. However, a significant component of cell death was attributable to autophagy, and both DIM and BRCA1 inhibited H2O2-induced autophagy. Our findings suggest that low concentrations of DIM protect cells against oxidative stress via the tumor suppressor BRCA1 by several distinct mechanisms. [Cancer Res 2009;69(15):6083–91]" @default.
• W2148689968 created "2016-06-24" @default.
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• W2148689968 date "2009-07-29" @default.
• W2148689968 modified "2023-10-01" @default.
• W2148689968 title "Low Concentrations of Diindolylmethane, a Metabolite of Indole-3-Carbinol, Protect against Oxidative Stress in a BRCA1-Dependent Manner" @default.
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• W2148689968 doi "https://doi.org/10.1158/0008-5472.can-08-3309" @default.
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