Effects of compressive loading on human synovium-derived cells.

Area of Science:

• Biomaterials Science
• Cell Biology
• Rheumatology

Background:

• Temporomandibular joint (TMJ) synovitis is associated with compressive stress, but the underlying mechanisms remain unclear.
• Mechanical stress on TMJ synovial cells may induce degenerative changes in temporomandibular joint disease.

Purpose of the Study:

• To investigate the effects of cyclic compressive loading on human TMJ synovium-derived cells in vitro.
• To elucidate the role of mechanical stress in TMJ synovitis and degenerative processes.

Main Methods:

• Human TMJ synovium-derived cells were cultured on collagen scaffolds to create 3D constructs.
• Cyclic compressive loading was applied using a custom apparatus.
• Analysis included DNA content, apoptosis, inflammatory cytokine mRNA, and matrix metalloproteinase (MMP) expression and activity.

Main Results:

• Cyclic compression did not alter DNA amount or apoptotic cell numbers.
• MMP-2, MMP-3, and IL-8 mRNA expression increased significantly with compression.
• MMP-1 and MMP-3 protein expression and MMP-2 activity were detected post-compression.

Conclusions:

• Compression of human TMJ synovium-derived cells modulates inflammatory cytokine and MMP expression.
• These findings suggest a potential mechanism linking mechanical stress to TMJ synovitis and degenerative changes.