Using load to improve tendon/ligament tissue engineering and develop novel treatments for tendinopathy

Area of Science:

• Biomedical Engineering
• Musculoskeletal Biology
• Tissue Regeneration

Background:

• Tendon and ligament injuries are common and heal poorly, hindering native tissue function restoration.
• Anatomical variations in mechanical properties, composition, and structure complicate healing.
• Pathology can alter tissue loading, impacting molecular pathways and remodeling.

Purpose of the Study:

• To review the stage-specific regulation of mechanically sensitive pathways during tendon and ligament development and maturation.
• To discuss structural features in healing and diseased tendons contributing to aberrant loading.
• To explore how disturbed molecular signaling impacts healing and degenerative phenotypes.

Main Methods:

• Review of in vitro, animal, and human studies on healthy and diseased tendons.
• Analysis of mechanically sensitive pathways and tenogenic genes.
• Examination of structural features affecting tissue loading and molecular signaling.

Main Results:

• Mechanical loads (tension, compression, shear) regulate distinct molecular pathways involved in tissue remodeling.
• Specific genes like scleraxis and mohawk are key in tenogenic pathways.
• Aberrant loading profiles in healing/diseased tendons disrupt molecular signaling, leading to poor healing.

Conclusions:

• Understanding mechanically sensitive pathways is crucial for improving tendon and ligament healing.
• Targeted approaches in rehabilitation, orthobiologics, and tissue engineering can be advanced.
• Further research integrating mechanical and molecular perspectives is needed for better outcomes.