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Dithiaarsanes Induce Oxidative Stress-Mediated Apoptosis in HL-60 Cells by Selectively Targeting Thioredoxin Reductase

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journal contribution
posted on 26.06.2014 by Yaping Liu, Dongzhu Duan, Juan Yao, Baoxin Zhang, Shoujiao Peng, HuiLong Ma, Yanlin Song, Jianguo Fang
The selenoprotein thioredoxin reductase (TrxR) plays a pivotal role in regulating cellular redox homeostasis and has attracted increasing attention as a promising anticancer drug target. We report here that 2-(4-aminophenyl)-1,3,2-dithiarsinane (PAO–PDT, 4), a potent and highly selective small molecule inhibitor of TrxR, stoichiometrically binds to the C-terminal selenocysteine/cysteine pair in the enzyme in vitro and induces oxidative stress-mediated apoptosis in HL-60 cells. The molecular action of 4 in cells involves inhibition of TrxR, elevation of reactive oxygen species, depletion of cellular thiols, and activation of caspase-3. Knockdown of TrxR sensitizes the cells to 4 treatment, whereas overexpression of the functional enzyme alleviates the cytotoxicity, providing physiological relevance for targeting TrxR by 4 in cells. The simplicity of the structure and the presence of an easily manipulated amine group will facilitate the further development of 4 as a potential cancer chemotherapeutic agent.