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Updated: Aug 26, 2025

In Vitro and In Vivo Detection of Mitophagy in Human Cells, C. Elegans, and Mice
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In Vitro and In Vivo Detection of Mitophagy in Human Cells, C. Elegans, and Mice

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Evaluating mitophagy in embryonic stem cells by using fluorescence-based imaging.

Kun Liu1,2,3, Xing Li1,2, Zheng Li4

  • 1State Key Laboratory of Stem Cell and Reproductive Biology, Institute for Stem Cell and Regeneration, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.

Frontiers in Cell and Developmental Biology
|October 3, 2022
PubMed
Summary
This summary is machine-generated.

Evaluating mitophagy in embryonic stem cells (ESCs) is crucial for understanding mitochondrial health and pluripotency. The mito-Keima system offers a reliable method for quantifying mitophagy in ESCs, advancing regenerative medicine research.

Keywords:
ATG3LC3PINK1mitophagymt-keima

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Area of Science:

  • Cell Biology
  • Stem Cell Biology
  • Mitochondrial Biology

Background:

  • Embryonic stem cells (ESCs) possess self-renewal and pluripotency, vital for regenerative medicine.
  • Mitophagy, the selective degradation of mitochondria, plays a key role in regulating ESC pluripotency and mitochondrial homeostasis.
  • Existing methods for evaluating mitophagy in ESCs, such as LC3-II and mitochondria colocalization, face challenges due to cell size and mitophagosome visibility.

Purpose of the Study:

  • To evaluate and identify an objective method for detecting and quantifying mitophagy in embryonic stem cells (ESCs).
  • To assess the suitability of fluorescence-based imaging techniques for studying mitophagy in the unique context of ESCs.
  • To establish a reliable tool for investigating the link between mitochondrial homeostasis and pluripotency in ESCs.

Main Methods:

  • Comparison of two common fluorescence-based imaging methods for mitophagy detection in ESCs.
  • Utilized autophagy- or mitophagy-defective ESC lines to validate mitophagy assessment techniques.
  • Employed the mito-Keima (mt-Keima) fluorescent protein system for mitophagy quantification.

Main Results:

  • The mito-Keima (mt-Keima) system was identified as a suitable and effective method for detecting and quantifying mitophagy in ESCs.
  • Demonstrated the efficacy of mt-Keima in overcoming challenges associated with observing mitophagosomes in small ESCs.
  • Validated the mt-Keima system using genetically modified ESC lines with defects in autophagy or mitophagy pathways.

Conclusions:

  • The mt-Keima system provides a robust and objective tool for studying mitophagy in embryonic stem cells.
  • This method facilitates a deeper understanding of mitochondrial quality control mechanisms in ESCs.
  • The findings support the use of mt-Keima for future research on mitophagy's role in ESC pluripotency and regenerative medicine applications.