1–34 PTH Effect on the Chondroprogenitor Cells Differentiation, As Well As on the Microstructure of the Subchondral None Tissue, and the Regeneration of Articular Cartilage in Rats

Abstract

The purpose of the present study was to investigate the impact of intermittent and constant administration of 1–34 PTH fragment on bovine chondroprogenitor cells differentiation contained in chondrogenic and osteogenic media. In addition, regeneration of the cartilage tissue of non-native rats and the dependence of this process on the level of parathyroid hormone, as well as changes in the subchondral bone, were studied. Monolayer cultures of bovine chondroprogenitor cells contained in osteogenic and chondrogenic medium with periodic and constant addition of 1–34 PTH, were examined by immunofluorescence analysis to reveal appropriate markers. Rats’ knee joints have been operated with the full thickness defect formation, and further investigation of the regeneration processes depending on the introduction of the PTH in vivo by histochemical analysis of the operated knee joints. The findings suggest that the modulating effect of PTH on chondrogenic differentiation of stem cells and the therapeutic potential of this hormone for cartilage regeneration.