PTH (1-34) enhances the therapeutic effect of bone marrow mesenchymal stem cell-derived exosomes by inhibiting proinflammatory cytokines expression on OA chondrocyte repair in vitro.

The study showed that IL-2, TNF-α, and IL-6 levels increased significantly in OA chondrocytes; however, both Exo BMSC and Exo PTH reduced the levels of IL-2, TNF-α, and IL-6. Exo PTH increased the migration, proliferation, and chondral matrix formation of OA chondrocytes in vitro.

Countstar (model not specified) generated cell-concentration measurements for the study's cell samples during quality assessment for the immune-cell research.