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质谱成像用于在单细胞水平上的不和脂质异构体中CC定位的特征

Chengjian Qi¹, Xiaoni Li¹, Qian Li²

¹Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, Center for Imaging and Systems Biology, College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China.

Analytical chemistry

|September 13, 2024

概括

这项研究引入了一种使用帕特诺-布基 (P-B) 反应和飞行时间二次离子质谱法 (ToF-SIMS) 绘制单细胞中不和脂质的新方法. 这种技术可以识别碳-碳双键的位置,这对于了解疾病至关重要.

科学领域:

利皮多米克 (Lipidomics) 是一种消化剂.
生物化学生物化学
分析化学分析化学

背景情况:

含有碳-碳双键 (CC) 的不和脂质对疾病发展至关重要.
质谱成像 (MSI) 可以映射脂质异构体,但在单细胞水平上难以识别CC定位异构体.

研究的目的:

在单细胞水平上开发一种新的方法来表征CC局部在不和脂质异构体中的特征.
为了使疾病研究能够精确地绘制单个细胞内脂质异构体的地图.

主要方法:

使用飞行时间二次离子质谱 (ToF-SIMS) 与帕特诺-布奇 (P-B) 光化学反应相结合.
生成P-B附加产物并使用ToF-SIMS中的碰撞诱导解离来确定CC键位.
将这种方法应用于小鼠的大脑和骨组织以及各种细胞系.

主要成果:

在多种生物样本中,在单细胞分辨率下成功可视化了脂质异构体.
在不同的细胞微区域和类型中揭示了脂肪酸18:1同位素组成的明显变化.
具有高空间分辨率准确识别和描述复杂脂质结构的能力.

结论:

开发的P-B ToF-SIMS方法可以在单细胞水平上准确识别不和脂质中的CC位置异构体.
这种方法提供了高空间分辨率,有助于理解脂质异构体在生理学和疾病中的作用.
这些发现有助于更深入地了解特定脂质结构的病理意义.

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