摘要
目的观察去细胞猪主动脉瓣膜基质支架材料的体外降解方式和过程。方法将制备好的去细胞猪主动脉瓣膜基质支架材料90片随机分为3组,胶原酶组、弹性蛋白酶组和水解对照组,每组30片,分别用0.05m g/m l胶原酶I、0.05m g/m l弹性蛋白酶和磷酸盐缓冲液(PBS)作为降解液在体外处理去细胞猪主动脉瓣膜。于处理后第3、6、9、12、15和30d从每组取出5个平行样本观察瓣膜组织形态学改变,测定降解失重率、降解液中蛋白含量、羟脯氨酸含量等指标。结果胶原酶组和弹性蛋白酶组去细胞瓣膜基质支架材料均随降解时间延长逐渐变得菲薄、韧性差、组织疏松、纤维网孔变大、断裂,降解液外观变浑浊,瓣膜失重率增加,降解液蛋白含量和羟脯氨酸含量增加(P<0.01);胶原酶组较弹性蛋白酶组对去细胞猪主动脉瓣膜基质支架材料的降解作用强。结论胶原酶和弹性蛋白酶对去细胞猪主动脉瓣膜基质支架材料均有降解作用,且前者的降解作用强于后者。
Objective To investigate the way and process of degradation behavior of acellular porcine aortic valve in vitro. Methods Acellular porcine aortic valve（n=90）were randomly divided into 3 groups （collagenase group, elastase group, control group）, 30 piece in each group . Behavior of acellular porcine aortic valve was degradated with 0.05mg/ml collagenase Ⅰ, 0. 05mg/ml elastase, phosphate buffered solution in collagenase group, elastase group and control group. The histomorphology, weight loss, value of protein and hydroxyproline were observed at 3,6,9, 12, 15 and 30d after degradation. Results The behavior of acellular porcine aortic valve of collagenase group and elastase group became poorer, looser and broken gradually in degradation. The weight loss of valve, the value of protein and hydroxyproline in vehiculum became greater gradually in collagenase group and elastase group（P〈0. 01）. Furthermore the effect of collagenase Ⅰ was strong than elastase in degradation. Conclusion The effect of collagenase Ⅰ and elastase can degradate the acellular porcine aortic valve in vitro. Collagenase Ⅰ is strong than elastase in degradation.
出处
《中国胸心血管外科临床杂志》
CAS
2006年第4期242-246,共5页
Chinese Journal of Clinical Thoracic and Cardiovascular Surgery
基金
国家自然科学基金资助项目(30271292)~~
关键词
体外降解
去细胞瓣膜
细胞外基质
Degradation in vitro
Aeellular valve
Extraeellular matrix
