Effect of bone extracellular matrix synthesized in vitro on the osteoblastic differentiation of marrow stromal cells

Biomaterials
Néha DattaAntonios G Mikos

Abstract

Alternative materials for bone grafts are gaining greater importance in dentistry and orthopaedics, as the limitations of conventional methods become more apparent. We are investigating the generation of osteoinductive matrix in vitro by culturing cell/scaffold constructs for tissue engineering applications. The main strategy involves the use of a scaffold composed of titanium (Ti) fibers seeded with progenitor cells. In this study, we investigated the effect of extracellular matrix (ECM) laid down by osteoblastic cells on the differentiation of marrow stromal cells (MSCs) towards osteoblasts. Primary rat MSCs were harvested from bone marrow, cultured in dexamethasone containing medium and seeded directly onto the scaffolds. Constructs were grown in static culture for 12 days and then decellularized by rapid freeze-thaw cycling. Decellularized scaffolds were re-seeded with pre-cultured MSCs at a density of 2.5 x 10(5) cells/construct and osteogenicity was determined according to DNA, alkaline phosphatase, calcium and osteopontin analysis. DNA content was higher for cells grown on decellularized scaffolds with a maximum content of about 1.3 x 10(6) cells/construct. Calcium was deposited at a greater rate by cells grown on decell...Continue Reading

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Citations

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