目的探讨白芷香豆素(Coumarin of Angelicae dahuricae,CAD)的镇痛作用机制.方法采用热板法,通过工具药观察CAD的镇痛作用与阿片受体和单胺类神经递质的关系;利用硝酸还原酶法检测CAD对甲醛所致伤害性疼痛模型小鼠血清一氧化氮(N...目的探讨白芷香豆素(Coumarin of Angelicae dahuricae,CAD)的镇痛作用机制.方法采用热板法,通过工具药观察CAD的镇痛作用与阿片受体和单胺类神经递质的关系;利用硝酸还原酶法检测CAD对甲醛所致伤害性疼痛模型小鼠血清一氧化氮(NitricOxide,NO)的含量.结果纳洛酮(5mg/kg)部分拮抗CAD(60mg/kg)的镇痛作用;利血平(4mg/kg)可以部分拮抗CAD(60mg/kg)的镇痛作用.CAD(30,60,120mg/kg)连续给药4d,使甲醛所致伤害性疼痛模型小鼠血清NO含量明显下降.结论CAD具有明显的镇痛,其镇痛作用与阿片受体和脑内单胺类神经递质有一定的关系.此外,明显减少NO的合成可能是其发挥镇痛作用的重要机制.展开更多
Background Preconditioning with repeated electroacupuncture (EA) could mimic ischemic preconditioning to induce cerebral ischemic tolerance in rats. The present study was designed to investigate whether mu(μ)-, d...Background Preconditioning with repeated electroacupuncture (EA) could mimic ischemic preconditioning to induce cerebral ischemic tolerance in rats. The present study was designed to investigate whether mu(μ)-, delta(δ)- or kappa(κ)-opioid receptors are involved in the neuroprotecUon induced by repeated EA preconditioning. Methods The rats were pretreated with naltrindole (NTI), nor-binaltorphimine (nor-BNI) or D-Phe-Cys-Tyr-D- Trp-Om-Thr-Pen-Thr-NH2 (CTOP), which is a highly selective δ-, κ- or μ-opioid receptor antagonist respectively, before each EA preconditioning (30 minutes per day, 5 days). Twenty-four hours after the last EA treatment, the middle cerebral artery occlusion (MCAO) was induced for 120 minutes. The brain infarct volume was determined with 2,3,5-tdphenyltetrazolium chloride staining at 24 hours after MCAO and compared with that in rats which only received EA preconditioning. In another experiment, the met-enkephalin-like immunoreactivity in rat brain was investigated by immunohistochemistry in both EA preconditioning and control rats. Results The EA preconditioning reduced brain infarct volume compared with the control rats (P=-0.000). Administration of both NTI and CTOP attenuated the brain infarct volume reduction induced by EA preconditioning, presenting with larger infarct volume than that in the EA preconditioning rats (P〈0.001). But nor-BNI administration did not block the infarct volume reduction induced by EA preconditioning, presenting with smaller infarct volume than the control group rats (P=-0.000). The number of met-enkephalin-like immunoreactivity positive neurons in the EA preconditioning rats was more than that of the control rats (P=-0.000). Conclusion Repeated EA preconditioning stimulates the release of enkephalins, which may bind 5- and p-opioid receptors to induce the tolerance against focal cerebral ischemia.展开更多
目的探讨心脏上的阿片受体是否介导了瑞芬太尼预适应对缺血后心脏保护作用。方法麻醉开胸大鼠心脏缺血再灌注模型。分为对照组(CON),缺血预适应组(IPC)和瑞芬太尼预适应组(RPC);瑞芬太尼预适应的方法:在缺血再灌注前分别静注瑞芬太尼5 m...目的探讨心脏上的阿片受体是否介导了瑞芬太尼预适应对缺血后心脏保护作用。方法麻醉开胸大鼠心脏缺血再灌注模型。分为对照组(CON),缺血预适应组(IPC)和瑞芬太尼预适应组(RPC);瑞芬太尼预适应的方法:在缺血再灌注前分别静注瑞芬太尼5 m in,停止5 m in共3个循环。三种阿片受体阻断剂Naltrindole(NTD,δ受体阻断剂,5 mg.kg-1)、nor-B inaltorph im ine(nor-BNI,к受体阻断剂,5 mg.kg-1)、CTOP(μ受体阻断剂,1 mg.kg-1),分别在RPC(NTD+RPC,BNI+RPC和CTOP+RPC组)和IPC(NTD+IPC,BNI+IPC和CTOP+IPC组)前静脉注射。观察指标包括:平均动脉压(MBP),心率(HR),记算收缩压心率乘积(RPP);缺血危险区(AAR),梗死区(IS)的体积,心肌梗死面积以IS/AAR来表示。结果在IS/AAR方面:NTD+RPC与CTOP+RPC与CON组之间无差别,与RPC有差别;nor-BNI+RPC与RPC及CON组之间都有差别;NTD+IPC和no-BNI+IPC与IPC组之间有差别,并且nor-BNI与CON组之间也有差别。结论μ,δ和κ-阿片受体介导了RPC对大鼠缺血后心脏的保护作用,μ-阿片受体的作用可能来至心脏之外的组织或器官。展开更多
文摘目的探讨白芷香豆素(Coumarin of Angelicae dahuricae,CAD)的镇痛作用机制.方法采用热板法,通过工具药观察CAD的镇痛作用与阿片受体和单胺类神经递质的关系;利用硝酸还原酶法检测CAD对甲醛所致伤害性疼痛模型小鼠血清一氧化氮(NitricOxide,NO)的含量.结果纳洛酮(5mg/kg)部分拮抗CAD(60mg/kg)的镇痛作用;利血平(4mg/kg)可以部分拮抗CAD(60mg/kg)的镇痛作用.CAD(30,60,120mg/kg)连续给药4d,使甲醛所致伤害性疼痛模型小鼠血清NO含量明显下降.结论CAD具有明显的镇痛,其镇痛作用与阿片受体和脑内单胺类神经递质有一定的关系.此外,明显减少NO的合成可能是其发挥镇痛作用的重要机制.
基金the National Natural Science Foundation of China(No.30471664).
文摘Background Preconditioning with repeated electroacupuncture (EA) could mimic ischemic preconditioning to induce cerebral ischemic tolerance in rats. The present study was designed to investigate whether mu(μ)-, delta(δ)- or kappa(κ)-opioid receptors are involved in the neuroprotecUon induced by repeated EA preconditioning. Methods The rats were pretreated with naltrindole (NTI), nor-binaltorphimine (nor-BNI) or D-Phe-Cys-Tyr-D- Trp-Om-Thr-Pen-Thr-NH2 (CTOP), which is a highly selective δ-, κ- or μ-opioid receptor antagonist respectively, before each EA preconditioning (30 minutes per day, 5 days). Twenty-four hours after the last EA treatment, the middle cerebral artery occlusion (MCAO) was induced for 120 minutes. The brain infarct volume was determined with 2,3,5-tdphenyltetrazolium chloride staining at 24 hours after MCAO and compared with that in rats which only received EA preconditioning. In another experiment, the met-enkephalin-like immunoreactivity in rat brain was investigated by immunohistochemistry in both EA preconditioning and control rats. Results The EA preconditioning reduced brain infarct volume compared with the control rats (P=-0.000). Administration of both NTI and CTOP attenuated the brain infarct volume reduction induced by EA preconditioning, presenting with larger infarct volume than that in the EA preconditioning rats (P〈0.001). But nor-BNI administration did not block the infarct volume reduction induced by EA preconditioning, presenting with smaller infarct volume than the control group rats (P=-0.000). The number of met-enkephalin-like immunoreactivity positive neurons in the EA preconditioning rats was more than that of the control rats (P=-0.000). Conclusion Repeated EA preconditioning stimulates the release of enkephalins, which may bind 5- and p-opioid receptors to induce the tolerance against focal cerebral ischemia.
文摘目的探讨心脏上的阿片受体是否介导了瑞芬太尼预适应对缺血后心脏保护作用。方法麻醉开胸大鼠心脏缺血再灌注模型。分为对照组(CON),缺血预适应组(IPC)和瑞芬太尼预适应组(RPC);瑞芬太尼预适应的方法:在缺血再灌注前分别静注瑞芬太尼5 m in,停止5 m in共3个循环。三种阿片受体阻断剂Naltrindole(NTD,δ受体阻断剂,5 mg.kg-1)、nor-B inaltorph im ine(nor-BNI,к受体阻断剂,5 mg.kg-1)、CTOP(μ受体阻断剂,1 mg.kg-1),分别在RPC(NTD+RPC,BNI+RPC和CTOP+RPC组)和IPC(NTD+IPC,BNI+IPC和CTOP+IPC组)前静脉注射。观察指标包括:平均动脉压(MBP),心率(HR),记算收缩压心率乘积(RPP);缺血危险区(AAR),梗死区(IS)的体积,心肌梗死面积以IS/AAR来表示。结果在IS/AAR方面:NTD+RPC与CTOP+RPC与CON组之间无差别,与RPC有差别;nor-BNI+RPC与RPC及CON组之间都有差别;NTD+IPC和no-BNI+IPC与IPC组之间有差别,并且nor-BNI与CON组之间也有差别。结论μ,δ和κ-阿片受体介导了RPC对大鼠缺血后心脏的保护作用,μ-阿片受体的作用可能来至心脏之外的组织或器官。