【摘要】 用刀豆球蛋白A(concanavalin A,Con A)预先处理的异种移植神经,对神经再生的影响。含Con A50mg的Ringer液1 000ml(4℃)灌注日本大耳兔2h后,取出兔的胫神经。麻醉Wistar大白鼠,切除其右坐骨神经5mm,移植入8mm长,经Con A处理的兔胫神经。术后4、8、12周,可见再生神经纤维通过近端吻合部,长入异种移植神经,继而越过远端吻合部,向远段坐骨神经生长。移植神经段和远段坐骨神经中再生神经纤维成束或散在分布,再生的无髓纤维散在于有髓纤维之间。8周以后,大鼠手术侧的腓肠肌乙酰胆碱酯酶(AChE)呈阳性,再生神经终末纤维与运动终板相连。手术侧爪部皮肤的真皮和表皮,出现再生神经纤维和游离感觉神经末梢。Con A预先处理兔神经,有利于宿主的再生神经纤维能通过异种移植神经向远段生长,重新支配靶器官。更多还原

【Abstract】 The effect of concanavalin A (Con A) on nerve regeneration in heterograft was done in the present study. A segment about 5mm long was removed from the right sciatic nerve of adult rats. A 8mm of the heterograft nerve segment from the tibial nerve of the rabbit and pretreated by Con A was transplanted into the gap of the severed rat nerve. Regenerating nerve fibers were found from the proximal part of the sciatic nerve into the graft, and also from the graft into the distal part of the sciatic nerve at the 4th,8th and 12th week after transplantation. Regenerating nerve fibers existed separately or clustered into fascicles in the graft,as well as in the distal part of sciatic nerve. Some unmyeli-nated nerve fibers were scattered among the regenerating myelinated fibers. The gastrocnemius muscle was AChE-positive at 8th and 12th week after transplantation. In silver-combined AChE staining section, the regenerating nerve fibers could be seen connecting with the motor endplates. There were regenerating free nerve endings and nerve fascicles in the dermis and epidermis at 8th and 12th week after transplantation. The present study showed that the pretreatment of Con A had benefit to that the regenerating nerve fibers to pass through the heterograft and reinnervated to the targetes.ADepartment of Anatomy,Jiangxi Medical College,Nanchang 330006,China更多还原