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相关概念视频

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...

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Updated: May 7, 2026

Visualizing Intracellular SNARE Trafficking by Fluorescence Lifetime Imaging Microscopy
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基于mRNA的FRET-FLIM成像平台用于量化脂质纳米粒子内体逃逸和膜损伤

Yian Fang1,2, Bin Ma1,2, Zhiqiang Zhao1,2,3

  • 1State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China.

Journal of the American Chemical Society
|August 15, 2025
PubMed
概括

研究人员开发了一种新方法,即mRNA-LNP跟踪的FRET终身成像 (FLINT),以测量mRNA如何有效地离开内分泌物. 该工具追踪mRNA释放和内体损伤,有助于开发更好的脂质纳米粒子 (LNP) 输送系统.

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科学领域:

  • 生物技术
  • 细胞生物学
  • 提供药物

背景情况:

  • 有效的内体逃生和膜损伤对于mRNA-脂质纳米粒子 (LNP) 传递至关重要,但这些过程的量化很困难.
  • 目前的方法缺乏动态分辨率来同时跟踪活细胞中的mRNA释放和内体完整性.

研究的目的:

  • 开发和验证一个新的平台,即FRET终身成像用于mRNA-LNP跟踪 (FLINT),用于实时监测mRNA释放动力学和内体损伤.
  • 研究LNP组成和内体相互作用对mRNA传递效率的影响.

主要方法:

  • 开发了FLINT,这是一个利用mRNA上的二硫化物结合光体的分子内振荡能量转移-光终身成像显微镜 (FRET-FLIM) 平台.
  • 利用细胞质和内体之间的差异性谷氨 (GSH) 度进行GSH激活信号放大 (20-50×) 以追踪细胞质mRNA.
  • 应用FLINT分析活细胞中的不同LNP配方的mRNA释放和内体损伤.

主要成果:

  • 在活细胞中,FLINT成功追踪了mRNA释放和内体损伤的动态.
  • 具有逃逸有利脂质的LNP显示出快速的细胞核mRNA释放,而吸收优化的LNP则在内分泌体中积累.
  • 在内体损伤和与mRNA表达相关的膜破裂时观察到GSH流入.
  • 证明LNP中的脂质组织,与内体损伤一起,影响mRNA传递效率.

结论:

  • FLINT提供了一种强大的工具来解开影响LNP交付效率的吸收,逃逸和结构因素.
  • 该平台可以在体外和体内进行机械研究和优化LNP,以提高mRNA的传递.
  • FLINT揭示了LNP,内分体和细胞质mRNA传递之间的复杂相互作用.