A preliminary study by our research group showed that 6-mm-long regeneration chamber bridging is equivalent to autologous nerve transplantation for the repair of 12-mm nerve defects. In this study, we compared the eff...A preliminary study by our research group showed that 6-mm-long regeneration chamber bridging is equivalent to autologous nerve transplantation for the repair of 12-mm nerve defects. In this study, we compared the efficacy of different lengths （6, 8, 10 mm） of nerve fragments bridging 6-mm regeneration chambers for the repair of 12-mm-long nerve defects. At 16 weeks after the regeneration chamber was implanted, the number, diameter and myelin sheath thickness of the regenerated nerve fibers, as well as the conduction velocity of the sciatic nerve and gastrocnemius muscle wet weight ratio, were similar to that observed with autologous nerve transplantation. Our results demonstrate that 6-, 8-and 10-mm-long nerve fragments bridging 6-mm regeneration chambers effectively repair 12-mm-long nerve defects. Because the chemoattractive capacity is not affected by the length of the nerve fragment, we suggest adopting 6-mm-long nerve fragments for the repair of peripheral nerve defects.展开更多
目的采用不依赖连接反应的克隆法,利用T7核酸外切酶和硫代磷酸化修饰引物克隆Notch2长片段基因。方法将难以扩增的Notch2 c DNA的编码序列(7416 bp)人为分成3段,引物设计时对此3个片段和载体骨架的引物进行碱基硫代磷酸化修饰,用这些引...目的采用不依赖连接反应的克隆法,利用T7核酸外切酶和硫代磷酸化修饰引物克隆Notch2长片段基因。方法将难以扩增的Notch2 c DNA的编码序列(7416 bp)人为分成3段,引物设计时对此3个片段和载体骨架的引物进行碱基硫代磷酸化修饰,用这些引物扩增Notch2的3个片段和载体骨架。然后用T7核酸外切酶分别处理PCR产物,产生4个具有3'互补突出末端的片段,并将此4个末端突出的片段退火复性,完成Notch2基因克隆。结果琼脂糖凝胶电泳结果显示Notch2 3个片段和载体骨架的PCR产物大小与预期大小相符,经退火复性获得的克隆通过PCR、酶切和测序进行克隆鉴定,确定Notch2编码序列已经插入到pc DNA3.0-3*Flag载体中。结论利用T7核酸外切酶和引物的碱基磷酸化修饰进行的不依赖连接反应的克隆方法能够用于长片段基因的克隆。展开更多
基金supported by Key Scientific Research Projects of Liaoning Provincial Medical Peak Construction Engineering,No.2010074
文摘A preliminary study by our research group showed that 6-mm-long regeneration chamber bridging is equivalent to autologous nerve transplantation for the repair of 12-mm nerve defects. In this study, we compared the efficacy of different lengths （6, 8, 10 mm） of nerve fragments bridging 6-mm regeneration chambers for the repair of 12-mm-long nerve defects. At 16 weeks after the regeneration chamber was implanted, the number, diameter and myelin sheath thickness of the regenerated nerve fibers, as well as the conduction velocity of the sciatic nerve and gastrocnemius muscle wet weight ratio, were similar to that observed with autologous nerve transplantation. Our results demonstrate that 6-, 8-and 10-mm-long nerve fragments bridging 6-mm regeneration chambers effectively repair 12-mm-long nerve defects. Because the chemoattractive capacity is not affected by the length of the nerve fragment, we suggest adopting 6-mm-long nerve fragments for the repair of peripheral nerve defects.
