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Wen-Yuan Li1,2, Xue-Yan Li1, Yong-Hui Tian1

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Pulsed electromagnetic fields (PEMFs) show promise in preventing bone loss in astronauts. This study found PEMFs maintained bone formation by activating the sAC/cAMP/PKA/CREB pathway, mitigating microgravity-induced bone density reduction.

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Area of Science:

  • Biomedical Engineering
  • Space Medicine
  • Bone Physiology

Background:

  • Microgravity poses significant health risks to astronauts, particularly bone loss.
  • Pulsed electromagnetic fields (PEMFs) are investigated as a countermeasure for spaceflight-induced bone demineralization.
  • Optimal PEMF parameters and mechanisms of action require further elucidation.

Purpose of the Study:

  • To evaluate the efficacy of optimized PEMF parameters in preventing bone loss in a rat model simulating microgravity.
  • To investigate the molecular mechanisms underlying PEMF's protective effects on bone.

Main Methods:

  • Hindlimb suspension in rats was used to simulate microgravity.
  • Optimal PEMF parameters (50 Hz, 0.6 mT, 50% duty cycle, 90 min/day) were applied.
  • Bone mineral density, maximal load, micro-structure, bone turnover markers, and signaling pathways (sAC/cAMP/PKA/CREB) were analyzed.

Main Results:

  • PEMF treatment preserved approximately 50% of bone mineral density and maximal load loss.
  • PEMFs maintained bone micro-structure, inhibited bone resorption, and promoted bone formation.
  • PEMFs modulated the sAC/cAMP/PKA/CREB signaling pathway, preserving osteoblast function.

Conclusions:

  • Optimized PEMF therapy can partially prevent bone loss induced by simulated weightlessness.
  • PEMFs exert protective effects by maintaining bone formation via the sAC/cAMP/PKA/CREB pathway.
  • PEMFs represent a potential therapeutic strategy for mitigating spaceflight-induced bone demineralization.