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基因编码纳米粒子的单粒子追踪:优化细胞质扩散研究的表达

Elizaveta Korunova¹, Vitali Sikirzhytski¹, Jeffery L Twiss²

¹Department of Drug Discovery & Biomedical Sciences, College of Pharmacy, University of South Carolina, Columbia, South Carolina.

Biophysical journal

|May 31, 2025

概括

我们优化了基因编码的多重体 (GEM) 来跟踪哺乳动物细胞中的细胞质扩散. 一个新的可诱导系统控制GEM粒子密度,改善用于研究细胞环境的成像和分析.

科学领域:

细胞生物学细胞生物学
生物物理学的生物物理.
纳米技术纳米技术

背景情况:

单粒子跟踪 (SPT) 探测器使用光纳米粒子检测细胞质性质.
遗传编码的多重体 (GEM) 是40纳米的粒子,适合研究类似于核糖体和蛋白质复合体的扩散.
了解GEM表达对扩散性的影响对于准确的细胞质分析至关重要.

研究的目的:

通过控制表达水平,优化哺乳动物细胞中的GEM跟踪.
评估GEM表达密度对测量的细胞质扩散率的影响.
通过考虑运动类型和异质性来增强GEM扩散性分析.

主要方法:

开发并比较一个可诱导多西环素的GEM表达系统与一个构成系统.
量化GEM粒子密度作为对多西环素度和化时间的反应.
结合了有效的扩散系数和位移的标准偏差以进行高级分析.

主要成果:

与构成性系统相比 (直到2000年),可诱导的GEM系统显著降低了颗粒密度 (每面积5-500个).
优化的颗粒密度改善了成像和细胞均性.
改进的分析方法提供了对GEM扩散性的更细致的理解.

结论:

一种可诱导多西环素的GEM系统可以精确控制颗粒密度,从而改善哺乳动物细胞中的SPT.
优化的GEM跟踪可以在各种条件下研究细胞质物理性质.
先进的扩散性分析增强了对复杂细胞环境中的粒子运动的解释.

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