Label-free imaging of intracellular organelle dynamics using flat-fielding quantitative phase contrast microscopy (FF-QPCM)

Author:

Ma Ying12ORCID,Dai Taiqiang3,Lei YunZe1,Zheng Juanjuan1ORCID,Liu Min1ORCID,Sui Bingdong3,Smith Zachary J.2ORCID,Chu Kaiqin2,Kong Liang3,Gao Peng1ORCID

Affiliation:

1. Xidian University

2. University of Science and Technology of China

3. The Fourth Military Medical University

Abstract

Panoramic and long-term observation of nanosized organelle dynamics and interactions with high spatiotemporal resolution still hold great challenge for current imaging platforms. In this study, we propose a live-organelle imaging platform, where a flat-fielding quantitative phase contrast microscope (FF-QPCM) visualizes all the membrane-bound subcellular organelles, and an intermittent fluorescence channel assists in specific organelle identification. FF-QPCM features a high spatiotemporal resolution of 245 nm and 250 Hz and strong immunity against external disturbance. Thus, we could investigate several important dynamic processes of intracellular organelles from direct perspectives, including chromosome duplication in mitosis, mitochondrial fusion and fission, filaments, and vesicles’ morphologies in apoptosis. Of note, we have captured, for the first time, a new type of mitochondrial fission (entitled mitochondrial disintegration), the generation and fusion process of vesicle-like organelles, as well as the mitochondrial vacuolization during necrosis. All these results bring us new insights into spatiotemporal dynamics and interactions among organelles, and hence aid us in understanding the real behaviors and functional implications of the organelles in cellular activities.

Funder

Ministry of Science and Technology of China's National Key Research and Development Program

National Natural Science Foundation of China

Natural Science Foundation of Shaanxi Province

Key industry innovation chain Foundation of Shaanxi Province

Fundamental Research Funds for the Central Universities

Basic and Applied Basic Research Foundation of Guangdong Province

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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