Mechanical Vibration Mitigates the Decrease of Bone Quantity and Bone Quality of Leptin Receptor-Deficient Db/Db Mice...

Area of Science:

• Endocrinology
• Bone Biology
• Mechanobiology

Background:

• Leptin regulates appetite and energy metabolism.
• Leptin has anabolic effects on bone.
• Leptin receptor-deficient (db/db) mice show decreased bone mass and impaired microstructure.

Purpose of the Study:

• To investigate bone microarchitecture, mechanical strength, and turnover in db/db mice.
• To explore whole-body vibration (WBV) as a noninvasive method to increase bone mass in these mice.

Main Methods:

• Systematic investigation of bone microarchitecture and mechanical strength using micro-computed tomography (μCT), three-point bending, and nanoindentation.
• Serum biochemical analysis for bone turnover markers.
• Bone histomorphometry and real-time PCR for molecular mechanisms.

Main Results:

• WBV (0.5g, 45Hz, 12 weeks) significantly ameliorated bone deterioration and improved mechanical strength in db/db mice.
• WBV decreased bone resorption markers (TRACP5b, CTx-1) and increased bone formation markers (OCN).
• WBV suppressed bone loss by modulating gene expression related to bone formation and resorption.

Conclusions:

• WBV effectively promotes bone quantity and quality in leptin receptor-deficient mice.
• WBV exhibits both anabolic and anticatabolic effects on bone in this model.
• This study enhances understanding of bone response to mechanical stimulation in leptin resistance.