Enamel matrix derivative expedites osteogenic differentiation of BMSCs via Wnt/β-catenin pathway in high glucose microenvironment

EMD may facilitate the osteogenic differentiation of BMSCs via activating the Wnt/β-catenin pathway in HG.

Extraction of BMSCs from Sprague-Dawley rats, culture, and identification were manifested. The cells were treated with different concentration of EMD in HG to figure out the most available concentration for proliferation and osteogenic differentiation. Then, observation of cell growth curve and cell cycle changes, and detection of Osterix, runt-related transcription factor 2 (Runx2), COL-I, early osteogenic indexes, Calcium salt deposition, and β-catenin protein in Wnt/β-catenin pathway were assured. After adding Wnt/β-catenin pathway inhibitor (XAV-939) in the cells with osteogenesis induction, detection of binding of β-catenin to Osterix was clarified.

Via identification BMSCs cultured in vitro was qualified. Different concentrations of EMD could accelerate cell proliferation in HG and osteogenesis induction, and 75 μg/mL EMD had the best effect. The HG augmented BMSCs proliferation and the propidium iodide index of flow cytometry cycle was elevated in HG, which were strengthened via the EMD. After BMSCs' osteogenesis induction, Osterix, Runx2, CoL-1, early osteogenic indexes, and calcium salt deposition were reduced, but elevated via EMD. β-Catenin was the lowest in the HG, but elevated after EMD. After addition of XAV-939, reduction of β-catenin and the downstream (Osterix and Runx2) were manifested. Detection of binding protein bands was in β-catenin and Osterix of the HG after EMD treatment.