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Imaging and Structural Analysis of Phospholipids and Sphingolipids in Rat Brain Tissue Sections

机译:大鼠脑组织切片中磷脂和鞘磷脂的成像和结构分析

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Phospholipids and sphingolipids are amphiphilic molecules that have structural and functional roles in cell membranes. Various phospholipids and sphingomyelins are widely distributed in the white and/or grey matter, whereas sulfatides are mainly located in white matter. Alterations in the level of phospholipids have been observed in neurological disorders such as Alzheimer disease [1] and ataxia [2]. Changes in sulfatide (ST) and sphingomyelin (SPH) metabolism was observed in lysosomal diseases [3] such as metachromatic leukodystrophy and Niemann-Pick disease, respectively. MALDI mass spectrometry has enabled direct analysis of tissue sections for lipid profiling and imaging. However, the detection of lipids by MALDI can be limited by the predominance of sodiated and potassiated molecular ions. In this study, we use a new matrix solution [4] to optimize the detection of phospholipids and sphingolipids species in both extracts and tissue sections. Salt adducts were decreased due to the presence of ammonium sulfate while heptafluorobutyric acid (HFBA) increased DHA stability in vacuum allowing for at least 12 hours of data acquisition for MALDI imaging mass spectrometry.
机译:磷脂和鞘脂是在细胞膜中具有结构和功能作用的两亲分子。各种磷脂和鞘磷脂在白色和/或灰质中广泛分布,而硫酸酯主要位于白物中。在诸如阿尔茨海默病(Alzheimer疾病[1]和Ataxia)之类的神经系统疾病中观察到磷脂水平的改变[2]。在溶酶体疾病[3]中观察到亚硫酸化酰胺(ST)和鞘磷脂(SPH)代谢的变化分别分别观察到溶酶体疾病[3]。 MALDI质谱使得能够直接分析组织切片以进行脂质分析和成像。然而,MALDI的脂质的检测可以受到链接和钾分子离子的优势的限制。在这项研究中,我们使用新的矩阵解决方案[4],优化磷脂和鞘脂在提取物和组织切片中的种类。由于硫酸铵存在,而庚络氟丁酸(HFBA)在真空中增加DHA稳定性,含有盐加合物的含量增加,允许对MALDI成像质谱法进行至少12小时的数据采集。

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