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Related Experiment Video

Updated: Dec 31, 2025

Activating Autophagy by Aerobic Exercise in Mice
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Mitophagy contributes to endothelial adaptation to simulated microgravity.

Laura Locatelli1, Alessandra Cazzaniga1, Clara De Palma2

  • 1Department Biomedical and Clinical Sciences L. Sacco, Università di Milano, Milano, Italy.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|January 10, 2020
PubMed
Summary

Mammalian cells adapt to microgravity stress by activating mitophagy, a process where cells clear damaged mitochondria. This study shows mitophagy helps endothelial cells conserve energy in simulated microgravity.

Keywords:
HUVECRWVcytoskeletonmitochondria

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Area of Science:

  • Cellular Biology
  • Space Medicine
  • Physiology

Background:

  • Mammalian cells perceive microgravity as stress, initiating adaptive responses.
  • Previous research identified stress proteins critical for endothelial cell survival and function under microgravity.
  • Endothelial cells play a vital role in vascular health and are susceptible to microgravity-induced changes.

Purpose of the Study:

  • To investigate the role of mitophagy in endothelial cell adaptation to simulated microgravity.
  • To explore the relationship between cytoskeletal dynamics and mitochondrial content during gravitational unloading.
  • To understand the metabolic adjustments in endothelial cells under microgravity conditions.

Main Methods:

  • Human primary endothelial cells were exposed to simulated microgravity using a rotating wall vessel for 4 and 10 days.
  • Mitophagy was assessed by measuring BCL2 interacting protein 3 (a mitophagy marker).
  • Mitochondrial content, oxygen consumption, and maximal respiratory capacity were quantified.

Main Results:

  • BCL2 interacting protein 3 levels increased significantly after 4 and 10 days of simulated microgravity.
  • Mitochondrial content, oxygen consumption, and maximal respiratory capacity were reduced, indicating a thrifty phenotype.
  • Microgravity-induced actin cytoskeleton disorganization was linked to the triggering of mitophagy.

Conclusions:

  • Mitophagy is a key mechanism for endothelial cell adaptation to gravitational unloading.
  • Endothelial cells develop a thrifty metabolic phenotype to cope with microgravity.
  • Cytoskeletal dynamics are connected to mitochondrial regulation during microgravity exposure.