脱细胞牛心包构建引导骨再生膜的初步研究

目的制备具有良好生物相容性和适宜降解吸收时间的引导骨组织再生（guided bone regeneration，GBR）膜材料。方法采用0．25％Trypsin＋0．5％Triton X-100酶联脱细胞法对新鲜牛心包进行脱细胞处理，将脱细胞牛心包（A组）、甘油保存脱细胞牛心包（B组）、碳化二亚胺1-ethyl-3-（3-dimethylamino propyl）carbodiimide hydrochloride，EDAC]交联脱细胞牛心包（C组）、甘油保存EDAC交联脱细胞牛心包（D组）4种膜材料分别植入38只SD大鼠背部皮下，不植人材料为E组。于2、4、8和16周分别处死大鼠7、12、12和7只，观察周围组织反应及材料的降解吸收情况。结果4种材料植入动物体内均有不同程度的炎性反应和纤维囊膜形成。术后4周，A组和C组的炎性反应轻微，纤维包膜变薄。A组膜材料吸收替代时间为8周左右，C组吸收替代时间为16周左右；16周时B组和D组材料仍有纤维包膜。结论EDAC交联脱细胞牛心包具有良好的生物相容性和理想的降解性能，在动物体内能顺利被自体组织替代。

EXPERIMENTAL STUDY ON ACELLULAR BOVINE PERICARDIUM GUIDED BONE REGENERATION MATERIAL

Objective To choose the best procedure on preparation of acellular bovine pericardium (ABP) guided bone regeneration (GBR) material. Methods The BP was decellularized with 0.25% Trypsin+0.5% Triton X-100. The acellular bovine pericardiums (ABPs) were treated with phosphate-buffered saline(PBS) (group A), 95% glycerol (group B), EDAC (group C), and EDAC and 95% glycerol (group D) respectively. The treated ABPs were implanted subcutaneously in the back of SD rats respectively at random and no material was implanted as control. Seven rats were sacrificed at 2 weeks, twelve at 4 weeks, twelve at 8 weeks, seven at 16 weeks. Local reaction was studied grossly. The amount of antigen presenting cell (APC) and the percentage of ABP degeneration were reckoned by images analysis system. Results The ABPs were replaced by fibroblasts completely in group A at 8 weeks, in group C at 16 weeks, but only less than 50% till 16 weeks in groups B and D. In all groups, the depth of surrounding fibres attenuated time-dependingly. The APC amount of the groups B and D was higher than that of the control group, and the ABP of the groups B and D degraded partly at 16 weeks. Conclusion The ABP treated with EDAC can be replaced by the surrounding tissues and has good biocompatibility.