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As a tissue engineering biomaterial, fibrin possesses outstanding biodegradable and biocompatible features except for its weak mechanical strength which limits its ranges of further application. In this study, hybrid scaffold was obtained by mixed fibrinogen and thrombin solution homogeneously in the presence of various amounts (0, 1, 2, and 4 mg, respectively) of non-woven fabric of PLGA fiber through traditional freeze-dried method to improve the mechanical strength while keeping its biological characters. The observation by scanning electron microscopy (SEM) showed that all the fibrin sponges have porous and interconnected pore structure, irrespective of the amount of PLGA fiber incorporated. In the measurement of the scaffold shrinkage, the percent of shrinkage of fibrin sponge incorporating PLGA fiber decreased when the amount of PLGA fiber incorporated increased compared with the fibrin sponge without PLGA fiber. The compression test suggested that compression modulus of PLGA fiber incorporated fibrin sponge significantly increased against the fibrin sponge without PLGA fiber; the incorporation of PLGA fiber enabled the mechanical strength of fibrin sponge to be effectively enhanced. Rat mesenchymal stem cells (rMSCs), which is of high potential to induce tissue regeneration, was selected to seed and culture in the fibrin scaffolds with or without PLGA fiber, and the number of rMSC was tested by DNA assay and calculated to examine which sponge was more favourable for rMSC to proliferate. The results reveal that the incorporation of PLGA fiber reinforced the fibrin scaffolds and maintained their intraspace. MSCs proliferated in fibrin scaffold with PLGA fiber was obviously on average more than that without PLGA fiber in vitro.

Research of mechanical strength enhanced fibrin-PLGA hybrid scaffold with its effect on proliferation of rMSC