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首页> 外文期刊>Carcinogenesis >Disulfiram is a direct and potent inhibitor of human O6-methylguanine-DNA methyltransferase (MGMT) in brain tumor cells and mouse brain and markedly increases the alkylating DNA damage.
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Disulfiram is a direct and potent inhibitor of human O6-methylguanine-DNA methyltransferase (MGMT) in brain tumor cells and mouse brain and markedly increases the alkylating DNA damage.

机译:双硫仑是脑肿瘤细胞和小鼠脑中人O6-甲基鸟嘌呤-DNA甲基转移酶(MGMT)的直接有效抑制剂,并显着增加了烷基化DNA的损伤。

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The alcohol aversion drug disulfiram (DSF) reacts and conjugates with the protein-bound nucleophilic cysteines and is known to elicit anticancer effects alone or improve the efficacy of many cancer drugs. We investigated the effects of DSF on human O(6)-methylguanine-DNA methyltransferase (MGMT), a DNA repair protein and chemotherapy target that removes the mutagenic O(6)-akyl groups from guanines, and thus confers resistance to alkylating agents in brain tumors. We used DSF, copper-chelated DSF or CuCl2-DSF combination and found that all treatments inhibited the MGMT activity in two brain tumor cell lines in a rapid and dose-dependent manner. The drug treatments resulted in the loss of MGMT protein from tumor cells through the ubiquitin-proteasome pathway. Evidence showed that Cys145, a reactive cysteine, critical for DNA repair was the sole site of DSF modification in the MGMT protein. DSF was a weaker inhibitor of MGMT, compared with the established O(6)-benzylguanine; nevertheless, the 24-36h suppression of MGMT activity in cell cultures vastly increased the alkylation-induced DNA interstrand cross-linking, G2/M cell cycle blockade, cytotoxicity and the levels of apoptotic markers. Normal mice treated with DSF showed significantly attenuated levels of MGMT activity and protein in the liver and brain tissues. In nude mice bearing T98 glioblastoma xenografts, there was a preferential inhibition of tumor MGMT. Our studies demonstrate a strong and direct inhibition of MGMT by DSF and support the repurposing of this brain penetrating drug for glioma therapy. The findings also imply an increased risk for alkylation damage in alcoholic patients taking DSF.
机译:酒精转化药物双硫仑(DSF)与蛋白质结合的亲核半胱氨酸反应并缀合,并且已知会单独引发抗癌作用或提高许多抗癌药的功效。我们调查了DSF对人O(6)-甲基鸟嘌呤-DNA甲基转移酶(MGMT)的影响,这是一种DNA修复蛋白和化学疗法的靶标,可从鸟嘌呤中去除诱变的O(6)-烷基,从而赋予对烷基化剂的抗性脑肿瘤。我们使用DSF,铜螯合DSF或CuCl2-DSF组合,发现所有治疗均以快速且剂量依赖性的方式抑制了两种脑肿瘤细胞系的MGMT活性。药物治疗导致肿瘤细胞中的MGMT蛋白通过泛素-蛋白酶体途径丢失。证据表明,对DNA修复至关重要的Cys145(一种反应性半胱氨酸)是MGMT蛋白中DSF修饰的唯一位点。与已建立的O(6)-苄基鸟嘌呤相比,DSF是较弱的MGMT抑制剂;然而,细胞培养物中MGMT活性的24-36h抑制极大地增加了烷基化诱导的DNA链间交联,G2 / M细胞周期阻滞,细胞毒性和凋亡标记物的水平。用DSF处理的正常小鼠肝脏和脑组织中MGMT活性和蛋白质水平显着降低。在带有T98胶质母细胞瘤异种移植物的裸鼠中,对肿瘤MGMT有优先抑制作用。我们的研究表明DSF对MGMT有强烈而直接的抑制作用,并支持将这种脑渗透药物重新用于神经胶质瘤治疗。该发现还暗示服用DSF的酒精中毒患者发生烷基化损伤的风险增加。

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