摘要:
目的:体外建立稳定的纤维蛋白凝胶释放系统,探讨不同浓度的凝血酶、抑肽酶对该系统释放速度的影响;研究该系统是否能作为4种生长因子(血小板衍生生长因子-AB、血管内皮生长因子、表皮细胞生长因子、转化生长因子β1)的缓释载体。方法分别构建不同浓度凝血酶、抑肽酶的凝胶释放系统;以该系统为载体,加入4种生长因子复合物并设立无生长因子的空白对照组,观察各组凝胶于恒温37°C水浴箱的释放情况,通过 ELISA 法检测生长因子浓度。结果凝血酶浓度相同时,抑肽酶浓度越高,纤维蛋白凝胶释放速度越慢(P 0.05),4种生长因子每日释放的浓度无明显差异(P >0.05)。结论纤维蛋白凝胶释放系统在体外可稳定、缓慢、均匀释放,其中凝血酶随着浓度的增加可加快凝胶释放系统释放,抑肽酶浓度的增加可抑制凝胶系统的释放;纤维蛋白凝胶系统可作为这4种生长因子的缓释载体。%Objective To investigate the effects of different concentrations of thrombin,trasylol on the release rate of the system in vitro by establishing a stable fibrin gel (FG ) release system, simultaneously discuss the possibility of FG as growth factors delivery system.Methods Different concentrations of thrombin,trasylol FG release system was established in vitro with fibrinogen,thrombin, trasylol,calcium chloride.The influence of growth factors on this FG release system was studied,four growth factors (platelet-derived growth factor-AB,vascular endothelial growth factor,epidermal growth factor,transforming growth factor-β1 )were added in this system as the experimental group,non growth factors as the control group,and the dissolution phenomenon of these two groups in 37 °C water bath was observed.The stabilities of biological activities of these growth factors in the release system were studied by measurements of the concentrations of growth factors in the experimental group by ELISA assay. Results When thrombin was at the same concentration,the higher the concentration of trasylol was,the slower dissolution rate of the FG release system was (P 0.05 ).Furthermore,there was no significant difference in the concentration of growth factors daily dissolution (P > 0.05 ).Conclusions The FG release system can dissolve in a steady,slow and well-distributed way.Under the condition of low concentrations of trasylol, the increase of concentration of thrombin can accelerate the dissolution rate of FG release system.In the different way,at high concentrations of thrombin,the increase of concentration of trasylol can delay the dissolution rate of this system.In addition,FG will be not affected by growth factors,and can maintain its stable biological activity,which indicates FG can be used as growth factors delivery system.