目的:观察电针预处理心经经穴对心肌缺血再灌注损伤(MIRI)大鼠小脑顶核(FN)神经元电活动的变化,探讨FN参与电针预处理对心肌的保护机制是否通过下丘脑外侧区(LHA)-FN神经通路实现。方法:将SD大鼠随机分为假手术组、模型组、电针组、损毁...目的:观察电针预处理心经经穴对心肌缺血再灌注损伤(MIRI)大鼠小脑顶核(FN)神经元电活动的变化,探讨FN参与电针预处理对心肌的保护机制是否通过下丘脑外侧区(LHA)-FN神经通路实现。方法:将SD大鼠随机分为假手术组、模型组、电针组、损毁LHA+电针组,每组12只。记录各组大鼠Ⅱ导联心电图ST段位移值、检测血清中心肌肌钙蛋白Ⅰ(cTnⅠ)的含量;记录各组大鼠FN神经元放电并进行分析。结果:再灌注2 h ST段位移值及cTnⅠ含量分析结果可见,与假手术组比较,模型组显著升高(P<0.01);与模型组和损毁LHA+电针组比较,电针组显著降低(P<0.01,P<0.05)。各组大鼠FN神经元自相关分析可见各组均有中间神经元放电。与假手术组比较,模型组FN放电次数显著减少(P<0.01);与模型组和损毁LHA+电针组比较,电针组神经元放电次数显著增多(P<0.01,P<0.05),FN神经元放电次数与再灌注2 h ST段位移值、cTnⅠ含量存在显著负相关性(P<0.01)。结论:电针预处理心经经穴可提高大鼠FN中间神经元放电频率,减轻MIRI效应;损毁LHA后,电针预处理对MIRI大鼠的心肌保护效应降低,LHA-FN神经通路参与了针刺减轻MIRI的中枢整合机制。展开更多
To investigate whether changes of amino acid neurotransmitter releases in the rostral ventrolateral medulla （rVLM） were related to acupuncture and to the antihypertensive effect of melatonin （Mel） microinjected in...To investigate whether changes of amino acid neurotransmitter releases in the rostral ventrolateral medulla （rVLM） were related to acupuncture and to the antihypertensive effect of melatonin （Mel） microinjected into the anterior hypothalamic area （AHA） of rats with stress-induced hypertension （SIH）, as well as to compare and analyze the relationship between the both antihypertensive mechanisms of acupuncture and of Mel in the AHA. Methods： Animal model of SIHR was made by electric foot shocks combined with noises. Electroacupuncture （EA） was used and “Zusanli” acupoint of both side was selected. The technique of drug microinjection into the brain was used to observe the change of blood pressure （BP）, and synchronously, brain microdialysis was performed for collecting dialysate samples, and then the concentration of amino acid neurotransmitters in the dialysate samples was determined by high performance liquid chromatography combined with fluorescent detection （HPLC-FD）. Results： After the animal received stress treatment, the BP elevated, synchronously, the release of glutamate （Glu） in the rVLM increased, and when EA was performed, the elevated BP of the rats with SIH decreased, simultaneously, the release of Glu in the rVLM decreased also. After Mel was microinjected of into the AHA of the SIHR, the elevated BP attenuated, meanwhile, the release of Glu decreased, and those of γ-aminobutyric acid （GABA） and taurine （Tau） increased in the rVLM.Administration of bicuculline, an antagonist of GABAA receptor, into the rVLMprior to microinjection of Mel imo the AHA could partially block the depressor effect of Mel in the AHA. Conclusion： The decrease in the release of Glu in the rVLM contributes to the antihypertensive effect of both acupuncture and Mel in the AHA in the rats with SIH, and the increase in the release of GABA and Tau in the rVLM is also im0ortam to Mel in the AHA.展开更多
文摘目的:观察电针预处理心经经穴对心肌缺血再灌注损伤(MIRI)大鼠小脑顶核(FN)神经元电活动的变化,探讨FN参与电针预处理对心肌的保护机制是否通过下丘脑外侧区(LHA)-FN神经通路实现。方法:将SD大鼠随机分为假手术组、模型组、电针组、损毁LHA+电针组,每组12只。记录各组大鼠Ⅱ导联心电图ST段位移值、检测血清中心肌肌钙蛋白Ⅰ(cTnⅠ)的含量;记录各组大鼠FN神经元放电并进行分析。结果:再灌注2 h ST段位移值及cTnⅠ含量分析结果可见,与假手术组比较,模型组显著升高(P<0.01);与模型组和损毁LHA+电针组比较,电针组显著降低(P<0.01,P<0.05)。各组大鼠FN神经元自相关分析可见各组均有中间神经元放电。与假手术组比较,模型组FN放电次数显著减少(P<0.01);与模型组和损毁LHA+电针组比较,电针组神经元放电次数显著增多(P<0.01,P<0.05),FN神经元放电次数与再灌注2 h ST段位移值、cTnⅠ含量存在显著负相关性(P<0.01)。结论:电针预处理心经经穴可提高大鼠FN中间神经元放电频率,减轻MIRI效应;损毁LHA后,电针预处理对MIRI大鼠的心肌保护效应降低,LHA-FN神经通路参与了针刺减轻MIRI的中枢整合机制。
文摘To investigate whether changes of amino acid neurotransmitter releases in the rostral ventrolateral medulla （rVLM） were related to acupuncture and to the antihypertensive effect of melatonin （Mel） microinjected into the anterior hypothalamic area （AHA） of rats with stress-induced hypertension （SIH）, as well as to compare and analyze the relationship between the both antihypertensive mechanisms of acupuncture and of Mel in the AHA. Methods： Animal model of SIHR was made by electric foot shocks combined with noises. Electroacupuncture （EA） was used and “Zusanli” acupoint of both side was selected. The technique of drug microinjection into the brain was used to observe the change of blood pressure （BP）, and synchronously, brain microdialysis was performed for collecting dialysate samples, and then the concentration of amino acid neurotransmitters in the dialysate samples was determined by high performance liquid chromatography combined with fluorescent detection （HPLC-FD）. Results： After the animal received stress treatment, the BP elevated, synchronously, the release of glutamate （Glu） in the rVLM increased, and when EA was performed, the elevated BP of the rats with SIH decreased, simultaneously, the release of Glu in the rVLM decreased also. After Mel was microinjected of into the AHA of the SIHR, the elevated BP attenuated, meanwhile, the release of Glu decreased, and those of γ-aminobutyric acid （GABA） and taurine （Tau） increased in the rVLM.Administration of bicuculline, an antagonist of GABAA receptor, into the rVLMprior to microinjection of Mel imo the AHA could partially block the depressor effect of Mel in the AHA. Conclusion： The decrease in the release of Glu in the rVLM contributes to the antihypertensive effect of both acupuncture and Mel in the AHA in the rats with SIH, and the increase in the release of GABA and Tau in the rVLM is also im0ortam to Mel in the AHA.
