路德维希-索雷特显微镜使用振动光热效应
Keiichiro Toda1, Takuro Ideguchi1
1Institute for Photon Science and Technology, The University of Tokyo, Tokyo 113-0033, Japan.
概括
振动光热 (ViP) 显微镜使无标签的细胞内索雷特成像能够可视化生物分子运输. 这种新方法揭示了细胞细胞质与细胞核的反向分子运输以及细胞死亡过程中的变化.
科学领域:
- 生物医学光学 生物医学光学
- 细胞生物物理学 细胞生物物理学
- 化学成像技术 化学成像技术
背景情况:
- 振动显微镜为生物医学研究提供无标签,选择性结合的化学对比.
- 传统方法可以检测拉曼散射或红外线吸收.
- 振动光热 (ViP) 显微镜使用折射率变化进行间接化学对比,从而实现了新的成像.
研究的目的:
- 使用ViP显微镜引入无标签的细胞内热泳 (Soret) 成像.
- 可视化和量化生物分子运输是由生物细胞内的温度梯度驱动的.
- 扩大振动显微镜在细胞内研究方面的能力.
主要方法:
- 开发了ViP诱导的Soret (ViPS) 成像技术.
- 通过光学加热 (振动光热效应) 产生稳定状态温度梯度.
- 使用光学衍射断层扫描进行时间分辨率折射率成像.
主要成果:
- 使用ViPS成像测量活的COS7细胞中的细胞内扩散和索雷特系数.
- 与核相比,在细胞质中观察到反向分子运输 (负索雷特效应).
- 在二氧化碳枯竭的条件下,已注意到降低的热泳活性,这表明在细胞死亡过程中聚合物聚合和玻璃形成.
结论:
- ViPS成像为研究细胞内热泳提供了一种新的方法.
- 在细胞质和核中表现出明显的细胞内运输行为.
- 将减少的热泳与死亡过程中的细胞变化联系在一起,这表明研究细胞死亡机制的潜力.
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