A multi-throughput mechanical loading system for mouse intervertebral disc

Area of Science:

• Biomedical Engineering
• Musculoskeletal Biology
• Regenerative Medicine

Background:

• Mechanical loading is crucial for intervertebral disc health.
• Excessive mechanical stress is a primary driver of disc degeneration.
• Existing organ culture systems often focus on human or large animal discs.

Purpose of the Study:

• To develop and validate a new mouse disc organ culture system.
• To apply dynamic compression loading to mouse lumbar discs.
• To establish a model for studying disc degeneration in mice.

Main Methods:

• A customized micro-culture device with precise axial compression was engineered.
• A computer-controlled system with a linear actuator and force sensor was utilized.
• PDMS-based chambers allowed simultaneous loading of six discs, enhancing statistical power.

Main Results:

• A detrimental loading regimen (0.5 MPa, 1 Hz, 7 days) was established for mouse lumbar discs.
• Live-dead assays, histology, and collagen staining confirmed the detrimental effects.
• The system demonstrated potential for simulating various mechanical compression profiles.

Conclusions:

• A novel mechanical loading system for dynamic axial compression of mouse discs was successfully developed.
• This system provides a valuable tool for studying disc pathogenesis in mouse models.
• It complements existing bioreactor systems and expands research capabilities for disc-related diseases.