Pyrrolizidine Alkaloid Secondary Pyrrolic Metabolites Construct Multiple Activation Pathways Leading to DNA Adduct Formation and Potential Liver Tumor Initiation
作者:Qingsu Xia、Xiaobo He、Liang Ma、Shoujun Chen、Peter P. Fu
DOI:10.1021/acs.chemrestox.8b00096
日期:2018.7.16
(DHP)-derived DNA adducts. To date, the primary pyrrolic metabolites dehydro-PAs, their hydrolyzed metabolite DHP, and two secondary pyrrolic metabolites 7-glutathione-DHP (7-GS-DHP) and 7-cysteine-DHP are the known metabolites that can generate these DHP-DNA adducts in vivo and/or in PA-treated cells. Secondary pyrrolic metabolites are formed from the reaction of dehydro-PAs with glutathione, amino acids, and
吡咯嗪核生物碱(PAs)及其N-氧化物衍生物是肝毒性,遗传毒性和致癌性植物化学物质。PA通过一组四个(±)-6,7-dihydro-7-hydroxy-1-hydroxymethyl-5 H介导的一般遗传毒性机制诱导肝肿瘤-吡咯烷嗪(DHP)衍生的DNA加合物。迄今为止,主要的吡咯代谢物脱氢PAs,它们的水解代谢物DHP和两个次要的吡咯代谢物7-谷胱甘肽-DHP(7-GS-DHP)和7-半胱氨酸-DHP是已知的能够产生这些DHP-DNA的代谢物在体内和/或在PA处理的细胞中形成加合物。次要的吡咯代谢物是由脱氢PA与谷胱甘肽,氨基酸和蛋白质的反应形成的。在这项研究中,我们确定了更多次生吡咯代谢物是否可以与小牛胸腺DNA和HepG2细胞中的细胞DNA结合,从而导致使用一系列次生吡咯代谢物(包括7-甲氧基-DHP, 9-乙氧基-DHP,9-缬氨酸-DHP,7-GS-DHP,7-半胱氨酸-DHP和7