Macromolecular Research, Vol.18, No.8, 787-792, August, 2010
Controlled Release of BMP-2 from Alginate Nanohydrogels Enhanced Osteogenic Differentiation of Human Bone Marrow Stromal Cells
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A new controlled release system is proposed for bone morphogenetic proteins (BMP)-induced osteoblastic growth and differentiation of the human bone marrow stromal cells (hBMSCs) using injectable nanohydrogels. Alginate nanohydrogels (ANH) containing BMP-2 (BMP-2@ANH) were prepared using a reverse emulsificationdiffusion technique. The mean particle diameter of the BMP-2@ANH measured by dynamic light scattering was 520 nm. The proliferation of hBMSCs was promoted with the BMP-2@ANH. The controlled release of BMP-2 from the BMP-2@ANH enhanced the differentiation of hBMSCs into osteoblasts, which was confirmed by RT-PCR
and alkaline phosphate activity. With the BMP-2@ANH, calcification and phosphate deposits on the cells were confirmed by alizarin red-S staining and von-kossa staining, respectively, showing that the differentiation of hBMSCs into osteoblasts was activated by the BMP-2 released from the BMP-2@ANH. Growth factor delivery using a nanohydrogel is a potential method for facilitating the differentiation of stem cells in vivo.
Keywords:human bone marrow stromal cells;alginate nanohydrogel;BMP-2;controlled release;osteogenic differentiation
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