This study was conducted to compare the in vitro proliferation and osteogenic differentiation potential of mesenchymal stem cells (MSCs) derived from mandibular (M-MSCs) or femur (F-MSCs) tissues of rats. M-MSC and F-MSC cultures were isolated and established from the same rat. Cultures were observed for morphological changes by microscope and growth characteristics by CCK-8 and cloning assays. Cell adhesion ability on a culture plate and titanium sheet was detected by staining with toluidine blue and Hoechst 33258, respectively. The levels of Ca, P, and ALP (serially) during osteogenic differentiation were evaluated. Cultures were analyzed for mineralization potential with alizarin red and ALP staining methods and for differentiation markers with RT-PCR (, , and ). M-MSCs and F-MSCs were successfully isolated from the same rat with uncontaminated culture, which showed significant differences in morphology. The proliferation rate of M-MSCs was higher than F-MSCs in primary culture, but significantly lower after passage. More colonies are formed from F-MSCs than from M-MSCs. M-MSCs showed a significantly higher mineralization and osteogenic differentiation potential, which might be of significance for use in bone/dental tissue engineering. In vitro, cell passage will decrease the proliferation ability of M-MSCs. The higher mineralization and osteogenic differentiation potential of M-MSCs could make them an approachable stem cell source for further application in stem cell-based clinical therapies.
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