An efficient enzymatic system for studying structure-carcinogenicity relationships: metabolism of pyrrolizidine alkaloids by human liver microsomes in the presence of calf thymus DNA, resulting in the formation of DNA adducts.
Xiaobo He, Qingsu Xia, Matthew S Bryant, Peter P Fu
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引用次数: 0
Abstract
Pyrrolizidine alkaloids (PAs) form a family of toxic and carcinogenic phytochemicals found in plants worldwide. The metabolism of toxic PAs, both in vivo and in vitro, generates four (±)-6,7-dihydro-7-hydroxy-1-hydroxymethyl-5H-pyrrolizine (DHP)-derived DNA adducts, namely, DHP-dG-3, DHP-dG-4, DHP-dA-3, and DHP-dA-4, as documented in previous research. We have proposed that these DHP-DNA adducts play a pivotal role in the induction of liver tumor by PAs in rats and mice, serving as potential common biological biomarkers for PA exposure and carcinogenesis. In this study, we found that the metabolism of PAs and PA N-oxides by human liver microsomes, in the presence of calf thymus DNA, results in the formation of DNA adducts. This process serves as a convenient and biologically significant platform for investigating the structure-carcinogenicity relationships of PAs.
研究结构-致癌关系的高效酶系统:人肝微粒体在小牛胸腺 DNA 存在下对吡咯烷生物碱的新陈代谢,形成 DNA 加合物。
吡咯里西啶生物碱(Pyrrolizidine alkaloids,PAs)是一种有毒的致癌植物化学物质,存在于世界各地的植物中。有毒 PAs 在体内和体外代谢过程中会产生四种 (±)-6,7- 二氢-7-羟基-1-羟甲基-5H-吡咯烷(DHP)衍生的 DNA 加合物,即 DHP-dG-3、DHP-dG-4、DHP-dA-3 和 DHP-dA-4。我们提出,这些 DHP-DNA 加合物在 PA 诱导大鼠和小鼠肝脏肿瘤的过程中起着关键作用,是 PA 暴露和致癌的潜在共同生物标志物。在这项研究中,我们发现在小牛胸腺 DNA 存在的情况下,人肝脏微粒体对 PAs 和 PA N-oxides 的代谢会形成 DNA 加合物。这一过程为研究 PA 的结构-致癌性关系提供了一个方便且具有生物学意义的平台。