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Solanum Muricatum Promotes Osteogenic Differentiation of Rat Bone Marrow Stromal Cells.

Solanum muricatum (SM), also known as pepino, is known for its antioxidative and anti-inflammatory effects. The aim of this study was to evaluate the effects of SM extract in promoting osteogenic differentiation and regulating the Wnt and bone morphogenetic protein (BMP) signaling pathways. Ingredients of pepino were extracted and identified. SM extracts were used to treat rat bone marrow stromal cells (BMSCs), followed by evaluating alkaline phosphatase activities and mineralization levels. The mRNA levels of osteogenic biomarkers, including OPN and Collagen I, were also evaluated with real-time polymerase chain reaction. After treatment with SM extracts, the expressions of key proteins in the Wnt and BMP signaling pathways were assessed. DKK-1 and noggin, which are Wnt and BMP inhibitors, respectively, were added with SM extracts to investigate the role of Wnt and BMP pathways in the ameliorating effects of SM extract in osteogenesis. Treatment of BMSCs with SM extract promoted osteogenesis. Meanwhile, upregulations in the Wnt and BMP pathways were also observed. However, inhibiting both pathways compromised the effects of SM extract in promoting osteogenic differentiation. SM extract promotes osteogenic differentiation in BMSCs via promoting the Wnt and BMP signaling pathways.