人工体神经-内脏神经反射弧建立后大鼠盆神经节-膀胱神经通路和递质研究

目的 观察人丁体神经-内脏神经反射弧建立后大鼠膀胱和盆神经节(MPG)之间的神经通路及神经递质性质.方法 8只成年wistar大鼠在体建立人工体神经-内脏神经反射弧.将辣根过氧化物酶(HRP)注射至实验大鼠的膀胱壁肌层,逆行神经追踪,通过免疫组织化学或组织化学方法显示HRP阳性标记细胞中的胆碱已酰转移酶(ChAT)、酪氨酸羟化酶(TH)、血管活性肠肽(VIP)、P物质(SP)和还原型辅酶Ⅱ(NADPH,NOS标志物).结果 支配膀胱的神经元多位于MPG主体部,呈圆形或椭圆形,无明显突起,多数为ChAT(40.1%,112/279)和TH(20.4%,50/245)免疫阳性,少数为VIP(10.7%,25/233)、NOS(6.5%,15/230)、SP(3.3%,8/242)反应阳性.结论 人工体神经-内脏神经反射弧建立后MPG中支配膀胱的神经元以胆碱能和肾上腺素能为主,VIP、SP和一氧化氮(NO)可能发挥神经调质作用.

Immunohistochemical characterization of pelvic neurons projecting to the bladder in rats with the artificial somatic-autonomic reflex arc

Objective Retrograde-tracing and immunohistochemical techniques were used in combination to investigate the types of putative transmitters in pelvic ganglia neurons projecting to the bladder of rats with the artificial somatic-autonomic reflex arc. Methods The artificial somatic-autonomic reflex arc was established in 8 rats by end-to-end microanastomosis of the proximal stump of the left L4 ventral root to the distal stump of L6 ventral root. The major pelvic ganglia (MPG) neurons innervating the urinary bladder were labeled by retrograde axonal tracing methods with the use of horseradish peroxidase (HRP) injected into the bladder wall and identified with TMB-HRP reaction. Then immunohistochemical (ChAT, TH, VIP, SP) and histochemical methods (NADPH-diaphorase activity and nitric oxide synthase immunoreac-tivity) were used to identify the neurotransmitters of HRP-labeled neurons projecting to the bladder. Results HRP-labeled neurons with spherical or oval shape mainly distributed in the MPG. The HRP-labeled neurons were positive for ChAT (112/279, 40. 1%), TH (50/245,20.4%), VIP(25/233, 10.7%), NOS ( 15/230, 6. 5% ) or SP (8/242, 3. 3% ) respectively. Conclusion These results suggest that ace-tylcholine and adrenaline are the predominant neurotransmitters of postganglionic neurons innervating bladder in rats with the artificial somatic-autonomic reflex arc. VIP, NO and SP may be as the neurotransmitters or neuromodulators to participate the procedure of urinary storage and voiding.