The effect of cyclical compressive loading on gene expression in articular cartilage

Blain EJ, Mason DJ, Duance VC · Biorheology

Thymosin β4 was one of the genes upregulated in cartilage after 10, 30 and 60 minutes of loading, in the same experimental system where loading raised matrix metalloproteinase expression and activation — placing endogenous Tβ4 upstream of the cartilage catabolic response to load.

Population

Articular cartilage explants under physiological cyclical compression (0.5 MPa, 1 Hz)

Intervention

None — differential display of mechanically regulated genes

Comparator

Unloaded explants

Limitations

Gene-expression screen in explants; identifies an association with the catabolic programme rather than proving Tβ4 drives it.