Study on mass transfer in the bone lacunar-canalicular system under different gravity fields

Area of Science:

• Bone biology
• Skeletal physiology
• Biomaterials science

Background:

• The bone lacunar-canalicular system (LCS) is crucial for signaling and transport in bone.
• Its function is linked to spaceflight and osteoporosis.
• Understanding mass transfer in varying gravity is vital for clinical treatments.

Purpose of the Study:

• To investigate mass transfer laws in bone microstructure under different gravity fields.
• To analyze the effects of pulsating pressure on bone mass transfer.
• To provide insights for effective clinical treatments related to bone health.

Main Methods:

• Utilized bovine tibial cortical bone LCS.
• Conducted mass transfer experiments using sodium fluorescein tracer.
• Applied varying frequency pulsating pressure and high G-force environments.

Main Results:

• Fluorescence intensity decreased with distance from the Haversian canal.
• Increased gravity enhanced fluorescence intensity, especially in deeper lacunae.
• High-frequency pulsating pressure improved LCS mass transfer efficiency.

Conclusions:

• High-intensity exercise may boost osteocyte activity and nutrient transport.
• Hypergravity enhances solute, nutrient, and signaling molecule transport in LCS.
• Microgravity may impair deep lacunar transport, risking bone loss and osteoporosis.