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Fetal Bone Marrow-Derived Mesenchymal Stem/Stromal Cells Enhance Humanization and Bone Formation of BMP7 Loaded Scaffolds.
Biotechnology Journal 2017 December
Tissue engineered constructs built with human cells capable of generating a bone-like organ within the mouse have attracted considerable interest over the past decade. Here, we aimed to compare the utility of human mesenchymal stem/stromal cells (MSC) isolated from fetal term placenta (fPL-MSC) and fetal first trimester bone marrow (fBM-MSC) in a polycaprolactone scaffold/BMP7-based model in nude mice. Furthermore, fPL-MSC were co-seeded with fetal placenta-derived endothelial colony forming cells (ECFC) to assess the impact of ECFC on fPL-MSC osteogenesis. X-ray radiography and micro computed tomography analyses showed enhanced bone formation in all BMP7 groups; however there was no difference after 2 months in bone formation between scaffolds seeded with fPL-MSC alone or combination of ECFC and fPL-MSC. Of interest, fBM-MSC showed the highest level of bone formation. Additionally, endochondral ossification contributed in generation of bone in fBM-MSC. Histological analysis showed the primary role of BMP in generation of cortical and trabecular bone, and the recruitment of hematopoietic cells to the scaffolds. Current in vivo engineered bone organs can potentially be used for drug screening or as models to study bone tissue development in combination with haematopoiesis.
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