生物固定方法对刺激拉曼散射显微镜信号的影响
Chiara Ceconello1,2, Wuji Han3, Bryce Manifold1
1Department of Bioengineering, University of California, Berkeley.
bioRxiv : the preprint server for biology
|November 26, 2025
概括
化学固定的影响 刺激拉曼散射 (SRS) 显微镜. 甲 (PFA) 和甲 (GA) 最少改变细胞和分子状态,确保细胞和组织的精确SRS成像.
科学领域:
- 细胞和分子成像技术
- 生物物理技术 生物物理技术
- 显微镜和光谱方法.
背景情况:
- 刺激拉曼散射 (SRS) 显微镜提供无标签的,生物样品的化学特异性成像.
- 化学固定通常有利于样品制备,但可以扰乱原生细胞状态并影响SRS信号.
- 了解固定剂诱导的变化对于准确解释SRS显微镜数据至关重要.
研究的目的:
- 使用SRS显微镜系统评估常见化学固定剂对细胞完整性和分子组成的影响.
- 评估不同的固定剂如何影响脂质和蛋白质含量以及Hela细胞模型中的细胞形态.
- 为可靠的定量SRS显微镜提供最佳样本准备指南.
主要方法:
- 黑拉细胞用各种固定剂进行处理:甲甲 (PFA),甲素,甲 (GA),甲醇和乙醇.
- 使用SRS显微镜分析了细胞完整性,分子组成 (脂质,蛋白质) 和形态.
- 进行了对SRS信号中固定剂诱导的变化的定量分析.
主要成果:
- 不同的固定剂表现出不同程度的细胞完整性和分子组成的破坏.
- 与其他固定剂相比,甲 (PFA) 显示出细胞和分子状态的最小扰动.
- 谷氨 (GA) 被确定为SRS成像的合适替代固定剂,有效地保存分子信息.
- 固定剂显著影响了脂质和蛋白质含量,影响了定量SRS测量.
结论:
- 固定剂的选择极大地影响了定量SRS显微镜的准确性.
- 建议使用偏甲 (PFA),因为它对原生细胞和分子状态的影响最小.
- 甲 (GA) 呈现了一个可行的替代SRS成像,当固定是必要的.
- 这项研究有助于选择最佳的样本制备方法,以对细胞过程和疾病进行可靠的基于SRS的研究.
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