In vitro release kinetics of biologically active transforming growth factor-β1 from a novel porous glass carrier

Sol-gel silica-based porous glass (xerogel) was used as a novel carrier material for recombinant human transforming growth factor-β1 (TGF-β1). Room temperature synthesis procedures included sol preparation, the addition of TGF-β1 solution to the sol, subsequent gelation and drying. After determination of optimal synthesis parameters, the material was assayed in vitro for its ability to release biologically active TGF-β1 in a controlled manner. Sustained release of TGF-β1 over a 7-day period was demonstrated. On the basis of published TGF-β1 potency, the amount released is capable of eliciting bone tissue reactivity. These findings suggest that this novel glass-growth factor composite may serve as an effective bone graft material for the repair of osseous defects.