目的观察重复阳极经颅直流电刺激(transcranial direct current stimulation,t DCS)对阿尔茨海默病(Alzheimer’s disease,AD)大鼠学习记忆能力的影响。方法将36只SD大鼠分为假手术组、AD组、20μA刺激组、60μA刺激组、100μA刺激组和...目的观察重复阳极经颅直流电刺激(transcranial direct current stimulation,t DCS)对阿尔茨海默病(Alzheimer’s disease,AD)大鼠学习记忆能力的影响。方法将36只SD大鼠分为假手术组、AD组、20μA刺激组、60μA刺激组、100μA刺激组和200μA刺激组,每组6只。AD组和刺激组的海马注射Aβ1-40制作AD模型。术后2周,刺激组接受重复阳极t DCS,而AD组和假手术组接受假刺激。t DCS后,用Morris水迷宫和Y迷宫检测大鼠学习记忆能力,尼氏染色观察大鼠海马神经元形态变化。结果 Morris水迷宫结果显示,60、100、200μA刺激组的潜伏期均较AD组明显降低(P<0.05)。大鼠经过原平台的次数和原平台象限游泳时间各组间差异并没有统计学意义(P>0.05)。Y迷宫结果显示100μA和200μA刺激后,大鼠学习记忆成绩较AD组均有明显改善(P<0.05)。尼氏染色显示t DCS后大鼠海马神经元胞质中尼氏体数量增加,染色加深。结论重复阳极t DCS能改善AD大鼠学习记忆功能障碍。展开更多
Objective To establish an artificial somatic-autonomic reflex arc in rats and observe the following distributive changes of neural fibers in the bladder. Methods Adult Sprague-Dawley rats were randomly divided into th...Objective To establish an artificial somatic-autonomic reflex arc in rats and observe the following distributive changes of neural fibers in the bladder. Methods Adult Sprague-Dawley rats were randomly divided into three groups： control group, spinal cord injury （SCI） group, and reinnervation group. DiI retrograde tracing was used to verify establishment of the model and to investigate the transport function of the regenerated efferent axons in the new reflex arc. Choline acetyltransferase （CHAT） in the DiI-labeled neurons was detected by immunohistochemistry. Distribution of neural fibers in the bladder was observed by acetylcholine esterase staining. Results DR-labeled neurons distributed mainly in the left ventral horn from L3 to L5, and some of them were also CHAT-positive. The neural fibers in the bladder detrusor reduced remarkably in the SCI group compared with the control （P 〈 0.05）. After establishment of the somatic-autonomic reflex arc in the reinnervation group, the number of ipsilateral fibers in the bladder increased markedly compared with the SCI group （P 〈 0.05）, though still much less than that in the control （P 〈 0.05）. Conclusion The efferent branches of the somatic nerves may grow and replace the parasympathetic preganglionic axons through axonal regeneration. Acetylcholine is still the major neurotransmitter of the new reflex arc. The controllability of detrusor may be promoted when it is reinnervated by the pelvic ganglia efferent somatic motor fibers from the postganglionic axons.展开更多
文摘Objective To establish an artificial somatic-autonomic reflex arc in rats and observe the following distributive changes of neural fibers in the bladder. Methods Adult Sprague-Dawley rats were randomly divided into three groups： control group, spinal cord injury （SCI） group, and reinnervation group. DiI retrograde tracing was used to verify establishment of the model and to investigate the transport function of the regenerated efferent axons in the new reflex arc. Choline acetyltransferase （CHAT） in the DiI-labeled neurons was detected by immunohistochemistry. Distribution of neural fibers in the bladder was observed by acetylcholine esterase staining. Results DR-labeled neurons distributed mainly in the left ventral horn from L3 to L5, and some of them were also CHAT-positive. The neural fibers in the bladder detrusor reduced remarkably in the SCI group compared with the control （P 〈 0.05）. After establishment of the somatic-autonomic reflex arc in the reinnervation group, the number of ipsilateral fibers in the bladder increased markedly compared with the SCI group （P 〈 0.05）, though still much less than that in the control （P 〈 0.05）. Conclusion The efferent branches of the somatic nerves may grow and replace the parasympathetic preganglionic axons through axonal regeneration. Acetylcholine is still the major neurotransmitter of the new reflex arc. The controllability of detrusor may be promoted when it is reinnervated by the pelvic ganglia efferent somatic motor fibers from the postganglionic axons.
