Effect of cefazolin loaded bone matrix gelatin on repairing large segmental bone defects and preventing infection / 中华创伤杂志(英文版)

<p><b>OBJECTIVE</b>To explore the possibility of repairing long segmental bone defects and preventing infection with cefazolin loaded bone matrix gelatin (C-BMG).</p><p><b>METHODS</b>C-BMG was made from putting cefazolin into BMG by vacuum absorption and lyophilization techniques. The sustaining period of effective drug concentration in vitro and in vivo was detected. The time of inhibiting bacteria, and the drug concentration in local tissues (bone and muscle) and plasma after implantation of C-BMG were examined by high performance liquid chromatography.</p><p><b>RESULTS</b>The effective inhibition time to staphylococcus aureus of C-BMG was 22 days in vitro; while 14 days in vivo. The cefazolin concentration in local tissues was higher in early stage, and later it kept a stable and low drug release. C-BMG showed an excellent ability to repair segmental long bone defects.</p><p><b>CONCLUSIONS</b>C-BMG can gradually release cefazolin with effective drug concentration and has excellent ability to repair segmental bone defects. It can be used to repair segmental long bone defects and prevent infection after operation.</p>

Effect of rabbit adipose-derived stem cells transfected by adenoviral vector mediated hTGF-?_1 gene on chondrocyte differentiation in vitro / 中华风湿病学杂志

Objective To investigate the proliferation of rabbit adipose-derived stem cell(ADSCs) transfected by adenoviral vector mediated hTGF-?_1 gene and its chondrocyte differentiation potential.Methods The Ad-hTGF-?_1 plasmid vetor which had the hTGF-?_1 gene was developed and transfected the ADSCs.The experimental group was the hTGF-?_1 transfected group.The cells enclosed by alginate were cultured in com- plete chondrogenie medium(CMM).The morphology of the cells were observed,and RT-PCR was used to measure hTGF-?_1 and collagenⅡexpression,at the same time western blot and immunohistochemistry were applied to detect the expression of collagenⅡin ADSCs before and after transfected with hTGF-?_1 gene. Results The hTGF-?_1 transfected ADSCs became the polygon and it proliferated well.The RT-PCR result of hTGF-?_1 on the transfected group was better than the control after transtected for 7 day and 21 day.The dif- ference between the two groups was significant(P