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Int J Med Sci ; 16(4): 567-575, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31171908


Bone tissue engineering requires a combination of cells, efficient biochemical and physicochemical factors, and biocompatible scaffolds. In this study, we evaluated the potential use of injectable Matrigel as a scaffold for the delivery of rat dental follicle stem/precursor cells (rDFSCs) transduced by bone morphogenetic protein (BMP) 9 to enhance osteogenic differentiation in vitro and promote ectopic bone formation in vivo. Recombinant adenovirus was used to overexpress BMP9 in rDFSCs. Alkaline phosphatase activity was measured using a histochemical staining assay and a chemiluminescence assay kit. Quantitative real-time polymerase chain reaction was used to determine mRNA expression levels of bone-related genes including distal-less homeobox 5 (DLX5), osteopontin (OPN), osterix (Osx), and runt-related transcription factor 2 (Runx2). Matrix mineralization was examined by Alizarin Red S staining. rDFSCs proliferation was analyzed using the Cell Counting Kit-8 assay. Subcutaneous implantation of rDFSCs-containing Matrigel scaffolds was used, and micro-computed tomography analysis, histological evaluation, and trichrome staining of implants extracted at 6 weeks were performed. We found that BMP9 enhanced alkaline phosphatase activity and mineralization in rDFSCs. The expression of bone-related genes (DLX5, OPN, Osx, and Runx2) was also increased as a result of BMP9 stimulation. Micro-computed tomography analysis and histological evaluation revealed that the bone masses retrieved from BMP9-overexpressing rDFSCs were significantly more pronounced in those with than in those without Matrigel. Our results suggest that BMP9 effectively promote osteogenic differentiation of rDFSCs, and Matrigel facilitate BMP9-induced osteogenesis of rDFSCs in vivo.

Fator 2 de Diferenciação de Crescimento/genética , Osteogênese/efeitos dos fármacos , Transplante de Células-Tronco , Alicerces Teciduais , Animais , Diferenciação Celular/efeitos dos fármacos , Colágeno/farmacologia , Saco Dentário/citologia , Combinação de Medicamentos , Fator 2 de Diferenciação de Crescimento/farmacologia , Humanos , Laminina/farmacologia , Células-Tronco Mesenquimais/efeitos dos fármacos , Osteogênese/genética , Proteoglicanas/farmacologia , Ratos , Células-Tronco/citologia , Células-Tronco/efeitos dos fármacos , Engenharia Tecidual , Microtomografia por Raio-X