从组织部份中提升探测三性的方法,使用溶解电喷射电离子化质谱成像成像
Heather Bottomley1, Jonathan Phillips1, Philippa Hart2
1Living Systems Institute, Department of Biosciences, University of Exeter, Stocker Road, Exeter EX4 4QD, U.K.
Journal of the American Society for Mass Spectrometry
|April 11, 2024
概括
环境电离质谱成像 (DESI-MSI) 现在在组织中检测到更多的蛋白质和. 这种技术为蛋白质组研究提供了增强的空间分辨率,改进了以前的方法.
科学领域:
- 质谱仪成像成像 质谱仪成像
- 蛋白质组学是指蛋白质组学.
- 生物化学 生物化学
背景情况:
- 脱电喷雾电离化质谱成像 (DESI-MSI) 通常用于小分子,蛋白质和的检测有限.
- 之前的DESI-MSI研究在数据解卷方面遇到了挑战,限制了检测到物种的数量和空间分辨率.
- 对于非分子的DESI-MSI和矩阵辅助激光溶解/电离 (MALDI) 之间的离子检测差异是已知的,并扩展到蛋白质组物种.
研究的目的:
- 评估DESI-MSI在组织段中增强检测和空间定位三性的潜力.
- 调查离子移动性分离对解决光谱重叠和改善多电荷检测的影响.
- 为了比较DESI-MSI和MALDI检测到的离子的空间定位.
主要方法:
- 用 DESI-MSI 分析了小鼠和老鼠大脑的组织部分,使用加热入口 (约. 450°C) 的温度.
- 使用离子移动性分离来解决光谱重叠,并增强多电荷离子的检测.
- 通过LC-MS数据识别和空间绘制了50μm (老鼠大脑) 和100μm (老鼠大脑) 像素大小的三性,并通过LC-MS数据进行了初步的蛋白质分配.
主要成果:
- 与之前的研究相比,DESI-MSI成功地检测出了较多的三性从组织部分中,并且具有较好的空间分辨率.
- 离子移动性分离显著改善了多重带电物种的检测,并解决了光谱重叠.
- DESI-MSI对离子的空间定位与MALDI相似,DESI-MSI进行了一些独特的检测,特别是低m/z的多重电荷物种.
结论:
- 通过离子移动性分离和加热入口增强的DESI-MSI显示了直接从组织中进行高分辨率蛋白质组分析的巨大潜力.
- 这种精细的DESI-MSI方法将其实用性扩展到检测更广泛的蛋白质组物种,包括多重电荷.
- 该技术提供了与MALDI相似的空间定位,同时可能检测其他方法遗漏的物种,为先进的空间蛋白质组学铺平了道路.
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