去甲肾上腺素和乙酰胆碱对大鼠离体室旁核神经元放电活动的影响

用31个脑片观察了去甲肾上腺素(NA)和乙酰胆碱(ACh)对90个室旁核神经元放电活动的影响。脑片灌流 NA(10^(-6)mol/L,3min)后,14/78(17%)个非周期型放电单位和7/12(58.3%)个周期型放电单位的放电频率增加,10/78(12%)个非周期型放电单位和2/12(16.6%)个周期型放电单位的放电频率明显降低甚至完全停止,54/78(69%)非周期型单位和3/12(25%)个周期型单位无明显反应。NA 对非周期型放电单位的兴奋作用可被 α 受体阻断剂酚妥拉明完全阻断,而 NA 对周期型单位的兴奋作用只能被部分阻断。脑片灌流 ACh(10^(-7)mol/L,3min)后,使15/78(19%)个非周期型和6/12(50%)个周期型单位放电频率增加,9/78(11%)非周期型和2/12(16.6%)个周期型放电单位放电频率降低,54/78(69%)非周期型和4/12(33.3%)周期型单位无反应。阿托品或东莨菪碱可翻转 ACh 对它们的作用。实验提示,NA 和 ACh 对室旁核神经元的兴奋或抑制作用是分别由 α、β 和 Μ 受体介导的。

膈下迷走神经切断降低LPS所致大鼠发热及室旁核神经元放电频率

目的 :探讨迷走神经是否可以作为LPS信息由外周组织传入中枢神经系统的桥梁。方法 :将Wistar大鼠随机分组 ,实验组为膈下迷走神经切断并给予LPS组 ,三个对照组为假手术生理盐水组 ,假手术LPS组 ,膈下迷走神经切断生理盐水组。用数字体温检测仪测定大鼠体温。用玻璃微电极记录正常大鼠和膈下迷走神经切断大鼠给予LPS前后下丘脑室旁核的单位放电。结果 :体温变化 :实验组大鼠体温变化值与假手术LPS组相比明显降低 (P <0 .0 5 )。单位放电变化 :正常大鼠给予LPS后室旁核单位放电放电频率明显增加 ,膈下迷走神经切断大鼠给予LPS后室旁核单位放电频率无明显变化。结论

针刺激活下丘脑室旁核神经元的特异性研究

目的:探讨针刺激活下丘脑室旁核热刺激及氢化可的松敏感(CRH相关)神经元的穴位特异性。方法:电生理学方法定性分析下丘脑室旁核神经元,比较针刺不同部位的20个穴位对CRH相关神经元的激活效应及特异性穴位对外周血皮质酮(CORT)水平的干预。结果:肾俞、期门、肝俞及京门为特异性穴位,膀胱经、肝经、胆经为特异性相关经脉,针刺特异性穴位可明显提高外周血CORT水平。结论:针刺激活下丘脑室旁核CRH相关神经元有穴位和经脉特异性。

针刺激活下丘脑室旁核促肾上腺皮质激素释放激素相关神经元特异性研究

目的观察针刺调节下丘脑-垂体-肾上腺皮质轴(HPA)功能的穴位特异性,并探讨针刺对HPA轴的调节是否具有累积效应。方法实验用SD雄性成年大鼠。胞外记录下丘脑室旁核促肾上腺皮质激素释放激素相关神经元电活动,比较针刺同一经脉不同神经节段、相同或相邻神经节段不同经脉的20个穴位对该神经元的激活效应及强度的差异,并观察不同针刺次数对不同时间点外周血皮质酮水平的影响。结果针刺20个穴位对该神经元的激活效应由大到小的顺序:肾俞>期门>肝俞>大椎>章门>腹哀>太乙>郄门>水沟>商曲>腹通谷>足三里>太冲>内关>京门>阳陵泉>承山>筑宾>三阴交>膻中。结论与肾上腺位于相同或相邻神经节段的膀胱经、肝经的穴位具有特异性效应,且有累积效应。

Effects of needling acupoints at different nerve segments on oxytocin neurons in rat’s hypothalamic paraventricular nucleus and intragastric pressure

Objective:To compare and explore the effects of needling acupoints at different nerve segments on the oxytocin(OT)neurons in the paraventricular nucleus of hypothalamus(PVN)and the intragastric pressure,and discuss the possible mechanisms.Methods:Thirty-two healthy adult Sprague-Dawley(SD)rats were numbered and divided into 4 groups according to the random number table,a Zusanli(ST 36)group,a Neiguan(PC 6)group,a Weishu(BL 21)group and a control group,with 8 rats in each group.Except the control group,rats in the other three groups received acupuncture at the corresponding acupoints.To observe the differences in double-labeled OT neurons and c-fos neurons of the hypothalamic PVN and the intragastric pressure after acupuncture among the three groups of needling acupoints at different nerve segments.Results:Compared with the control group,the numbers of double-labeled cells in the PVN of the Zusanli(ST 36)group and the Neiguan(PC 6)group decreased significantly,while the intragastric pressure increased significantly(all P<0.05),and the inter-group differences were statistically significant(P<0.05).The intragastric pressure in the Weishu(BL 21)group decreased significantly,and the inter-group difference was statistically significant(P<0.05).Compared with the Weishu(BL 21)group,the numbers of OT/c-fos double-labeled cells in PVN of the Zusanli(ST 36)group and the Neiguan(PC 6)group decreased significantly,and the intragastric pressure increased significantly,the inter-group differences were statistically significant(all P<0.01).Conclusion:Acupoints at different nerve segments have different regulation effects on intragastric pressure.The difference may be related to the different nerve conduction pathways by acupoints at different nerve segments in regulating the intragastric pressure.The PVN may be one common integration center for the regulation of gastric function in the three acupoints[Zusanli(ST 36),Neiguan(PC 6)and Weishu(BL 21)]at different nerve segments.