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使用MS3产品离子和银化进行前列腺素异构体的识别和成像
Leonidas Mavroudakis1, Ingela Lanekoff1
1Department of Chemistry-BMC, Uppsala University, Uppsala 75123, Sweden.
Journal of the American Society for Mass Spectrometry
|August 17, 2023
概括
这项研究引入了一种新的银离子方法,用于质谱成像,以区分组织中的前列腺素异构体. 这种技术允许前列腺素的空间定位,这对于理解炎症和怀孕至关重要.
科学领域:
- 利皮多米克 (Lipidomics) 是一种消化剂.
- 分析化学 分析化学
- 分子成像学分子成像学
背景情况:
- 前列腺素 (PGs) 是炎症和怀孕等生理过程中的重要脂质媒介.
- 由于它们的多样化作用和细胞特异性表达,在组织中局部研究个别PG异构体是必不可少的.
- 目前基于质谱 (MS) 的PG异构体分析方法通常涉及样本均质化,导致空间信息丢失.
研究的目的:
- 开发一种灵敏而强大的方法,用于在组织中区分和成像主要的前列腺素异构体 (PGE2,PGD2,Δ12-PGD2).
- 为了使PG异构体的空间映射使用质谱成像 (MSI) 而无需样本均化.
- 为了更好的异构体识别,研究银离子化PG的碎片化途径.
主要方法:
- 利用PG的银离子 (Ag+) 阴性化,提高MS的敏感性.
- 使用并列MS (MS3) 与特征产物离子来区分PG异构体.
- 开发了一种基于碎片化数据进行训练的预测模型,用于准确的异构组合分析.
- 应用该方法用于直接输液和质谱成像 (MSI),使用合银的气动辅助纳米喷雾溶解电喷雾电离.
主要成果:
- 在使用开发的MS3模型预测PG异构成分方面表现出高准确性和稳定性.
- 在老鼠子宫植入部位成功应用了主要PG异构体的异构体成像方法.
- 鉴定了PGE2,PGD2和Δ12-PGD2在反时计极和光上皮层的独特局部化模式.
- 展示了该方法与直接输液和液体基提取MSI的兼容性.
结论:
- 介绍了一种新,简单和敏感的方法,用于主要前列腺素异构体的异构成像.
- 能够在生物组织中直接可视化和定位PG异构体,从而保存空间信息.
- 这一进步有助于更深入地了解前列腺素在生理和病理过程中的局部作用.
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