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- W2008039712 abstract "Proceedings: AACR Annual Meeting 2014; April 5-9, 2014; San Diego, CAThioredoxin-1 (Trx1) is an antioxidant enzyme with a protective role in the removal of reactive oxygen species (ROS). We investigated the mechanism by which the redox modulator Trx1 affects base excision repair (BER) activity to understand the protective role of Trx1. We constructed a Trx1 knockdown system to demonstrate the specific mechanism of Trx1. DNA damage in terms of relative intensity of the DNA tail and γ-H2AX foci was markedly higher in the Trx1 shRNA cells compared with that in the wild type cells, leading to increased cellular susceptibility to a sublethal dose of BER-inducible toxicant, nitrosomethylurea (NMU). In addition, we observed a modulatory role of Trx1 in the BER pathway via the p53 downstream gene, growth arrest, and DNA-damage-inducible protein 45 α (Gadd45a). The protein level and function of p53, a Trx1 downstream gene, coincidently decreased in the Trx1 shRNA cells. Furthermore, Trx1 shRNA cells showed decreased Gadd45a expression and interaction of Gadd45a with apurynic/apyrimidinic endonuclease 1 (APE1) as well as APE1 activity. In conclusion, Trx1 might cooperate in the control of APE1 function by modulating the p53-mediated BER via the protein-protein interaction between Gadd45a and APE1, providing insight into the novel role of redox factor Trx1 in modulation of BER.Note: This abstract was not presented at the meeting.Citation Format: Hye Lim Kim, Preeyaporn Koedrith, Sang Min Lee, Yeo Jin Kim, Young Rok Seo. Protective role of thioredoxin-1 in base excision repair under redox modulation. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 2419. doi:10.1158/1538-7445.AM2014-2419" @default.
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- W2008039712 date "2014-09-30" @default.
- W2008039712 modified "2023-09-25" @default.
- W2008039712 title "Abstract 2419: Protective role of thioredoxin-1 in base excision repair under redox modulation" @default.
- W2008039712 doi "https://doi.org/10.1158/1538-7445.am2014-2419" @default.
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