法医学杂志 ›› 2023, Vol. 39 ›› Issue (4): 373-381.DOI: 10.12116/j.issn.1004-5619.2022.420510

• 论著 • 上一篇    下一篇

原发性脑干损伤致死大鼠的脑干组织代谢组学分析

苏秦1,2(), 陈倩玲3, 吴伟斌1, 向青青1, 杨成梁3, 乔东访3(), 李志刚1()   

  1. 1.广州市刑事科学技术研究所 法医病理学公安部重点实验室,广东 广州 510442
    2.中山大学中山医学院法医系,广东 广州 510080
    3.南方医科大学法医学院,广东 广州 510515
  • 收稿日期:2022-05-24 发布日期:2023-10-10 出版日期:2023-08-25
  • 通讯作者: 乔东访,李志刚
  • 作者简介:李志刚,男,博士,主检法医师,主要从事法医病理学研究;E-mail:23175556@qq.com
    乔东访,男,博士,主任法医师,主要从事法医病理学研究;E-mail:qiaodf@163.com
    苏秦(1990—),女,博士,主要从事法医物证学和法医病理学研究;E-mail:qinsu1359@163.com
  • 基金资助:
    广州市科技计划资助项目(2019030011)

Metabonomics Analysis of Brain Stem Tissue in Rats with Primary Brain Stem Injury Caused Death

Qin SU1,2(), Qian-ling CHEN3, Wei-bin WU1, Qing-qing XIANG1, Cheng-liang YANG3, Dong-fang QIAO3(), Zhi-gang LI1()   

  1. 1.Key Laboratory of Forensic Pathology, Ministry of Public Security, Guangzhou Forensic Science Institute, Guangzhou 510442, China
    2.Faculty of Forensic Medicine, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China
    3.School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China
  • Received:2022-05-24 Online:2023-10-10 Published:2023-08-25
  • Contact: Dong-fang QIAO,Zhi-gang LI

摘要:

目的 应用代谢组学方法观察原发性脑干损伤(primary brain stem injury,PBSI)致死大鼠脑干组织代谢产物的变化规律,探索诊断PBSI的潜在生物标志物。 方法 建立PBSI、非脑干脑损伤和剪头处死大鼠模型,采用基于LC-MS技术的代谢组学方法,获得脑干代谢图谱并将其注释到HMDB数据库,应用偏最小二乘-判别分析法(partial least square-discriminant analysis,PLS-DA)、随机森林算法筛选出与PBSI诊断相关的潜在代谢标志物。 结果 通过PLS-DA筛选出86种与PBSI相关的潜在代谢标志物,并通过随机森林算法建模和预测,准确率为83.3%。对注释到HMDB数据库的818种代谢标志物进行随机森林建模和预测,准确率高达88.9%。根据在死因鉴定中重要程度的排序,最终筛选出最为重要且在PBSI大鼠模型中显著上调的代谢标志物为HMDB0038126(京尼平苷酸)、HMDB0013272(N-月桂酰甘氨酸)、HMDB0005199[(R)-去甲猪毛菜碱]和HMDB0013645(NN-二甲基鞘氨醇)。 结论 京尼平苷酸、N-月桂酰甘氨酸、(R)-去甲猪毛菜碱和NN-二甲基鞘氨醇有望成为PBSI诊断的重要代谢物指标,进而为法医学实践提供线索。

关键词: 法医病理学, 代谢组学, 死亡原因, 原发性脑干损伤, 液相色谱-质谱法, 偏最小二乘-判别分析法, 随机森林算法, 大鼠

Abstract:

Objective To explore the potential biomarkers for the diagnosis of primary brain stem injury (PBSI) by using metabonomics method to observe the changes of metabolites in rats with PBSI caused death. Methods PBSI, non-brain stem brain injury and decapitation rat models were established, and metabolic maps of brain stem were obtained by LC-MS metabonomics method and annotated to the HMDB database. Partial least square-discriminant analysis (PLS-DA) and random forest methods were used to screen potential biomarkers associated with PBSI diagnosis. Results Eighty-six potential metabolic markers associated with PBSI were screened by PLS-DA. They were modeled and predicted by random forest algorithm with an accuracy rate of 83.3%. The 818 metabolic markers annotated to HMDB database were used for random forest modeling and prediction, and the accuracy rate was 88.9%. According to the importance in the identification of cause of death, the most important metabolic markers that were significantly up-regulated in PBSI group were HMDB0038126 (genipinic acid, GA), HMDB0013272 (N-lauroylglycine), HMDB0005199 [(R)-salsolinol] and HMDB0013645 (N,N-dimethylsphingosine). Conclusion GA, N-lauroylglycine, (R)-salsolinol and N,N-dimethylsphingosine are expected to be important metabolite indicators in the diagnosis of PBSI caused death, thus providing clues for forensic medicine practice.

Key words: forensic pathology, metabonomics, cause of death, primary brain stem injury, liquid chromato-graphy-mass spectroscopy (LC-MS), partial least square-discriminant analysis (PLS-DA), random forest algorithm, rats

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