中年2型糖尿病患者尿液生物标志初筛

Screening of urinary biomarkers in patients with type 2 diabetes mellitus

目的应用代谢组学方法筛选中年2型糖尿病患者尿液中的小分子生物标志。方法采用液相色谱-质谱联用技术(LC-MS)检测中年2型糖尿病患者和对照对象尿样中的内源性代谢产物,对检测所得总离子流图进行特征离子峰提取(MFE)、滤噪、峰匹配、峰对齐、归一化及基线校正,经t检验对在两组研究对象间有统计学差异(P<0.05)的化合物筛选鉴定。结果筛选出3个在两组研究对象尿样中表达水平有统计学差异(P<0.05)的代谢物:色氨酸、犬尿酸和犬尿酸原。中年2型糖尿病患者体内代谢产物色氨酸、犬尿酸经尿液代谢的水平下降,犬尿酸原经尿液代谢的水平升高。结论色氨酸、犬尿酸和犬尿酸原可能是与中年2型糖尿病相关的生物标志。

Objective To screen the biomarkers of the middle-aged type 2 diabetes （T2DM） in urine based on metabolomics. Methods First, both the metabolite profiles of morning urine sample in T2DM and control group were obtained by liquid chromatography- mass spectrometry （LC-MS）. Second, an automated compound （feature） extraction algorithm was employed for processing background subtracted single MS data. Then principal component analysis （PCA） and t-Test analysis was followed after preprocessing on the extractive data. Third, identifying the potential biomarkers that show significant difference between the two groups by searching the database online and comparing the results of MS/MS experiments to those available in literature and those standards. Results Three endogenous metabolites, among which tryptophan, kynurenic acid, and shown down-regulation while kynurenine shown up-regulation in T2DM, significantly differentiate between T2DM and control group. Conclusion Tryptophan, kynurenic acid and kynurenine may be considered as the potentail biomarkers related to T2DM.