核磁共振代谢组学研究狼毒大戟对大鼠粪便代谢物的影响

Nuclear Magnetic Resonance-based Metabonomic for Study of Feces from Rats Treated with Root of Euphorbia Fischeriana Steud Extract

应用核磁共振(NMR)代谢组学方法研究狼毒大戟根部毒性导致大鼠粪便代谢物的变化。将36只SPF级雄性SD大鼠随机分为3组,给药组大鼠腹腔注射高低两个剂量的狼毒大戟根部醇提物,对照组给予同体积含有3%吐温80的生理盐水。每天给药一次,连续给药15天后停药恢复15天,收集各组大鼠的粪便样品。利用NMR技术检测大鼠粪便中代谢物,对得到的~1H-NMR数据进行多元统计分析,获取大鼠粪便中内源性代谢产物的变化规律。通过Student t检验进一步确定具有统计学意义的生物标志物。大鼠粪便中鉴定出35种代谢物,狼毒大戟导致12种代谢物变化显著,其中谷氨酸、天冬氨酸、亮氨酸、丙氨酸、赖氨酸、蛋氨酸、苯丙氨酸、二甲胺、三甲胺、尿嘧啶含量下降,葡萄糖、丁酸含量升高。这些与肠道菌群有关的代谢物变化表明,狼毒大戟毒性导致大鼠的肠道菌群紊乱,进而造成了大鼠体内氨基酸、短链脂肪酸和葡萄糖代谢异常,为进一步揭示狼毒大戟的毒性提供了实验依据。

Nuclear magnetic resonance (NMR)-based metabonomics was applied to analyze the alterations of fecal metabolites induced by Euphorbia fischeriana Steud ( E. fischeriana ). A total of 36 SPF male Sprague-Dawley rats were randomly divided into three groups. The administered groups were intraperitoneally injected with different dosages of the extract, while the control group was given the same volume of normal saline containing 3% Tween 80. Rats were administered once a day for 15 consecutive days and withdrawal period lasted for 15 days, and the fecal samples of rats in each group were collected. NMR technology was applied to analyze the fecal samples of rats. The obtained 1H-NMR data were subjected to multivariate statistical analysis to select the altered endogenous metabolites in rat feces, and student test followed by multivariate statistical analysis to obtain the statistically significant biomarkers. Consequently, the metabolic signature of feces exhibited increased levels of glucose and butyrate, together with decreased levels of leucine, alanine, lysine, glutamate, methionine, aspartate, trimethylamine, dimethylamine, phenylalanine, and uracil in E. fischeriana extract administered groups. It could be seen that the significant altered metabolites associated with the metabolism of intestinal flora were futher induced disturbance in amino acid metabolism, short-chain fatty acids and glucose metabolism. The results provided experimental evidence to elucidate toxicity of E. fischeriana .