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Osteoblast dysfunction associated with mitophagy suppression under simulated microgravity.

Jindong Xue1, Min Wang1, Songsong Liu1

  • 1College of Intelligent Medicine and Biotechnology, Guilin Medical University, Guilin, 541199, China.

Biomedical Engineering Online
|October 6, 2025
PubMed
Summary
This summary is machine-generated.

Simulated microgravity impairs bone health by damaging mitochondria and reducing mitophagy. The small molecule icariin shows potential to restore bone cell function and combat bone loss.

Keywords:
IcariinMicrogravityMitophagyOsteoblast

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Area of Science:

  • Cell Biology
  • Bone Biology
  • Space Medicine

Background:

  • Spaceflight and mechanical unloading cause significant bone loss.
  • Simulated microgravity (SMG) disrupts bone homeostasis by inhibiting osteoblast function and promoting cell death.
  • The precise mechanisms linking SMG to bone loss, particularly involving mitochondrial quality control, are not fully understood.

Purpose of the Study:

  • To investigate the link between osteogenic dysfunction and mitochondrial damage under SMG.
  • To explore the role of mitophagy in SMG-induced bone loss.
  • To evaluate the therapeutic potential of icariin (ICA) in mitigating these effects.

Main Methods:

  • Established an SMG model using a rotary cell culture system.
  • Assessed osteoblast proliferation, apoptosis, and differentiation.
  • Analyzed mitochondrial function (ATP, ROS, membrane potential) and ultrastructure via TEM.
  • Measured mitophagy markers (PINK1, Parkin, p62, LC3B) and osteogenic markers.
  • Investigated the effects of icariin (ICA) treatment.

Main Results:

  • SMG inhibited osteoblast proliferation and differentiation, inducing apoptosis.
  • Mitochondrial function was impaired, with downregulated mitophagy markers and structural damage.
  • Icariin (ICA) treatment partially restored mitochondrial function, mitophagy, and osteogenic markers, improving cell viability.

Conclusions:

  • Impaired mitophagy is a key mechanism in unloading-induced bone loss.
  • SMG leads to osteogenic dysfunction and mitochondrial damage.
  • Icariin (ICA) shows promise as a therapeutic agent for preventing bone loss.