AIM: To determine the effects of electrical stimulation of nucleus ambiguus (NA) and dorsal motor nuclei of vagus (DMV) on gastric acid and bicarbonate secretion in rats. METHODS: NA and DMV in rats were electrically ...AIM: To determine the effects of electrical stimulation of nucleus ambiguus (NA) and dorsal motor nuclei of vagus (DMV) on gastric acid and bicarbonate secretion in rats. METHODS: NA and DMV in rats were electrically stimulated. Pylorus ligation or esophagus perfusion was used to collect the gastric secretion. The titratable H+ quantum, H+ concentration, HCO3- secretion quantum were measured. RESULTS: Electrical stimulation of NA had no effects on the volume of gastric juice, titratable acidity and acid concentration, but elicited a pronounced increase in the total bicarbonate. However, electrical stimulation of DMV significantly increased the titratable acidity, the volume of gastric juice and the acid concentration. Similarly, electrical stimulation of either NA or DMV decreased the respiratory frequency and sinus bradycardia. CONCLUSION: NA in rats can not control the secretion of gastric acid but the secretion of bicarbonate in gastric juice, while DMV controls the secretion of gastric acid.展开更多
目的黑质内注射脂多糖(lipopolysaccharide,LPS)制备帕金森模型大鼠(LPS大鼠),观察LPS大鼠排便情况及迷走运动背核(dorsal motor nucleus of the vagus,DMV)中酪氨酸羟化酶(tyrosine hydroxylase,TH)和胆碱乙酰转移酶(choline acetyltra...目的黑质内注射脂多糖(lipopolysaccharide,LPS)制备帕金森模型大鼠(LPS大鼠),观察LPS大鼠排便情况及迷走运动背核(dorsal motor nucleus of the vagus,DMV)中酪氨酸羟化酶(tyrosine hydroxylase,TH)和胆碱乙酰转移酶(choline acetyltransferase,ChAT)免疫反应阳性神经元胞体及神经纤维的分布特点。方法通过双侧黑质内注射LPS获得LPS大鼠;免疫荧光组织化学用于检测TH和ChAT免疫阳性神经元在DMV的分布。结果 LPS大鼠摄食和饮水情况与对照组相比较,差异无统计学意义,但粪便湿质量减轻,粪便内含水量显著减少,即出现便秘情况。LPS大鼠黑质内神经元大量丢失,并伴有胶质细胞增生、TH免疫阳性(IR)明显降低;而DMV内的TH-IR显著增强、ChAT-IR明显减弱。结论与黑质内注射六羟多巴相似,黑质内注射LPS可以引起大鼠出现便秘,该结果可能与LPS大鼠DMV中TH增多和ChAT降低导致胃肠动力紊乱有关。展开更多
目的:研究迷走神经背核(the dorsal motor nucleus of vagus,DMV)对大鼠小肠消化间期肌电活动的影响,探讨DMV对胃肠道功能活动的调控。方法:建立大鼠DMV电刺激模型,采用双极法测定大鼠空肠的消化间期复合肌电(IMC)。分析刺激后慢波频率...目的:研究迷走神经背核(the dorsal motor nucleus of vagus,DMV)对大鼠小肠消化间期肌电活动的影响,探讨DMV对胃肠道功能活动的调控。方法:建立大鼠DMV电刺激模型,采用双极法测定大鼠空肠的消化间期复合肌电(IMC)。分析刺激后慢波频率和振幅的变化、活动期的总持续时间及活动期与周期比值(A/T比值)的变化,刺激即时慢波与动作电位出现概率的变化。结果:电刺激DMV后大鼠空肠慢波的平均频率和平均振幅均增加(P<0.05),活动期总持续时间延长(P<0.01),A/T比值增大(P<0.05)。刺激即时,慢波的平均频率降低、平均振幅增加(P<0.01),快波出现概率增加(P<0.001)。结论:电刺激致DMV兴奋,可导致大鼠小肠肌电的活动异常,这可能是DMV机能损伤引发胃肠道功能紊乱的途径之一。展开更多
目的观察脂多糖(lipopolysaccharide,LPS)损伤大鼠黑质(substantia nigra,SN)后迷走神经背核(dorsal motor nucleus of the vagus,DMV)中酪氨酸羟化酶(tyrosine hydroxylase,TH)和多巴胺受体1(dopamine receptor 1,DR1)和多巴胺受体2(do...目的观察脂多糖(lipopolysaccharide,LPS)损伤大鼠黑质(substantia nigra,SN)后迷走神经背核(dorsal motor nucleus of the vagus,DMV)中酪氨酸羟化酶(tyrosine hydroxylase,TH)和多巴胺受体1(dopamine receptor 1,DR1)和多巴胺受体2(dopamine receptor 2,DR2)的表达变化。方法 30只SD大鼠根据随机数字表分为LPS大鼠组和对照组。LPS大鼠组双侧SN内注射LPS,对照组双侧SN内注射等体积的生理盐水。6周后进行转棒实验,检测胃排空能力,免疫荧光和免疫印迹检测SN内TH和DMV内TH、DR1和DR2的表达。结果经鉴定LPS组大鼠造模成功,胃排空能力降低,DMV中TH阳性细胞数量从(7±3)个增加到(12±2)个(P<0.05),DR1阳性细胞数量从(28±5)个减少到(18±6)个(P<0.05),DR2阳性细胞数量从(20±3)个增加到(33±4)个(P<0.05)。背侧延髓内,TH蛋白表达水平从(0.16±0.02)增多到(0.43±0.04)(P<0.05),DR1的蛋白表达水平从(0.78±0.05)下降至(0.36±0.03)(P<0.05),DR2的蛋白表达水平从(0.43±0.03)增加至(0.58±0.07)(P<0.05)。结论 LPS大鼠DMV中TH、DR1和DR2表达变化可能与帕金森病患者的胃排空障碍存在一定的联系。展开更多
基金Supported by Science Foundation of Shandong Province, No. Y2002D18
文摘AIM: To determine the effects of electrical stimulation of nucleus ambiguus (NA) and dorsal motor nuclei of vagus (DMV) on gastric acid and bicarbonate secretion in rats. METHODS: NA and DMV in rats were electrically stimulated. Pylorus ligation or esophagus perfusion was used to collect the gastric secretion. The titratable H+ quantum, H+ concentration, HCO3- secretion quantum were measured. RESULTS: Electrical stimulation of NA had no effects on the volume of gastric juice, titratable acidity and acid concentration, but elicited a pronounced increase in the total bicarbonate. However, electrical stimulation of DMV significantly increased the titratable acidity, the volume of gastric juice and the acid concentration. Similarly, electrical stimulation of either NA or DMV decreased the respiratory frequency and sinus bradycardia. CONCLUSION: NA in rats can not control the secretion of gastric acid but the secretion of bicarbonate in gastric juice, while DMV controls the secretion of gastric acid.
文摘目的黑质内注射脂多糖(lipopolysaccharide,LPS)制备帕金森模型大鼠(LPS大鼠),观察LPS大鼠排便情况及迷走运动背核(dorsal motor nucleus of the vagus,DMV)中酪氨酸羟化酶(tyrosine hydroxylase,TH)和胆碱乙酰转移酶(choline acetyltransferase,ChAT)免疫反应阳性神经元胞体及神经纤维的分布特点。方法通过双侧黑质内注射LPS获得LPS大鼠;免疫荧光组织化学用于检测TH和ChAT免疫阳性神经元在DMV的分布。结果 LPS大鼠摄食和饮水情况与对照组相比较,差异无统计学意义,但粪便湿质量减轻,粪便内含水量显著减少,即出现便秘情况。LPS大鼠黑质内神经元大量丢失,并伴有胶质细胞增生、TH免疫阳性(IR)明显降低;而DMV内的TH-IR显著增强、ChAT-IR明显减弱。结论与黑质内注射六羟多巴相似,黑质内注射LPS可以引起大鼠出现便秘,该结果可能与LPS大鼠DMV中TH增多和ChAT降低导致胃肠动力紊乱有关。
文摘目的:研究迷走神经背核(the dorsal motor nucleus of vagus,DMV)对大鼠小肠消化间期肌电活动的影响,探讨DMV对胃肠道功能活动的调控。方法:建立大鼠DMV电刺激模型,采用双极法测定大鼠空肠的消化间期复合肌电(IMC)。分析刺激后慢波频率和振幅的变化、活动期的总持续时间及活动期与周期比值(A/T比值)的变化,刺激即时慢波与动作电位出现概率的变化。结果:电刺激DMV后大鼠空肠慢波的平均频率和平均振幅均增加(P<0.05),活动期总持续时间延长(P<0.01),A/T比值增大(P<0.05)。刺激即时,慢波的平均频率降低、平均振幅增加(P<0.01),快波出现概率增加(P<0.001)。结论:电刺激致DMV兴奋,可导致大鼠小肠肌电的活动异常,这可能是DMV机能损伤引发胃肠道功能紊乱的途径之一。
文摘目的观察脂多糖(lipopolysaccharide,LPS)损伤大鼠黑质(substantia nigra,SN)后迷走神经背核(dorsal motor nucleus of the vagus,DMV)中酪氨酸羟化酶(tyrosine hydroxylase,TH)和多巴胺受体1(dopamine receptor 1,DR1)和多巴胺受体2(dopamine receptor 2,DR2)的表达变化。方法 30只SD大鼠根据随机数字表分为LPS大鼠组和对照组。LPS大鼠组双侧SN内注射LPS,对照组双侧SN内注射等体积的生理盐水。6周后进行转棒实验,检测胃排空能力,免疫荧光和免疫印迹检测SN内TH和DMV内TH、DR1和DR2的表达。结果经鉴定LPS组大鼠造模成功,胃排空能力降低,DMV中TH阳性细胞数量从(7±3)个增加到(12±2)个(P<0.05),DR1阳性细胞数量从(28±5)个减少到(18±6)个(P<0.05),DR2阳性细胞数量从(20±3)个增加到(33±4)个(P<0.05)。背侧延髓内,TH蛋白表达水平从(0.16±0.02)增多到(0.43±0.04)(P<0.05),DR1的蛋白表达水平从(0.78±0.05)下降至(0.36±0.03)(P<0.05),DR2的蛋白表达水平从(0.43±0.03)增加至(0.58±0.07)(P<0.05)。结论 LPS大鼠DMV中TH、DR1和DR2表达变化可能与帕金森病患者的胃排空障碍存在一定的联系。
