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强啡肽(Dynorphin)在体外标本中已证明是阿片活性极强的一种内源性阿片样物质,但人们对共生理功能所知甚少。为研究强啡肽对痛觉调制的作用,本工作向家兎中脑导水管周围灰质(PAG)或脊髓腰膨大蛛网膜下腔注射强啡肽,看共是否镇痛;或注 相似文献
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继脑啡肽和β-内啡肽的发现之后,Go-ldstein等于1979年由垂体提取出另一种以亮啡肽为N末端的内源性阿片样肽——强啡肽。这种十七肽广泛分布于中枢神经系统,尤以下丘脑和脊髓为著。 相似文献
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为了验证电针镇痛的中枢环节主要是在脊髓还是在脊髓上水平接通,我们将乙醚麻醉下的大鼠在脊髓胸3段横断(T_3组)。对照组在相当于胸3部位做一假手术,不断脊髓。术前及术后2、24、72小时给以2、15、100Hz恒频及2-15Hz变频电针刺激,观察电针镇痛效果,并给两组动物注射吗啡,比较吗啡镇痛效果。 1.大鼠后肢相当于足三里-三阴交部位给以电针刺激(3V,9V),引起辐射热-甩尾阈(TFL)增高100%以上。T_3组手术后2、24、72小时用3VEA刺激,各种频率的电针镇痛(EAA)均消失,只有将电压 相似文献
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本文用地高辛标记cRNA探针原位杂交技术结合计算机回家分析,观察了在正常、伤害性刺激、单纯针刺和电针镇痛条件下大鼠脊髓背角内生长抑素mRNA的变化特点.结果如下:正常情况下脊髓背角内含有少量生长抑素mRNA阳性细胞,主要集中于Ⅱ、Ⅰ层.伤害性刺激,单纯针刺后背角生长抑素mRNA均明显增多,与其他三级相比,电针镇捕后背角生长抑索mRNA进一步增多,上述变化以Ⅱ层最为显著,且以同侧为甚。以上结果揭示生长抑素参与疼觉调制并且在针刺镇痛中起一定作用,其作用机制有待进一步研究. 相似文献
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诱导型一氧化氮合酶在强啡肽致脊髓损伤中的作用 总被引:2,自引:0,他引:2
目的:探讨诱导型一氧化氮合酶(iNOS)在强啡肽致脊髓损伤中的作用。方法:[3H]-左旋精氨酸转化法测定腹侧和背侧脊髓iNOS活性,原位杂交法观测脊髓iNOSmRNA表达及其细胞分布。结果:大鼠蛛网膜下腔注射(InI)强啡肽A1-17(Dyn)20nmol引起持久性截瘫和迟发性神经元死亡;在Dyn致瘫后2~3hiNOSmRNA表达开始增多增强,4h达高峰,24h和48h仍见广泛表达,其分布以胶质细胞和大运动神经元为主;腹侧脊髓iNOS活性在Dyn致瘫后4h显著升高,并持续至24h和48h;提前10minInI选择性iNOS抑制剂氨基胍1μmol可显著对抗Dyn20nmol引起的持久瘫及伤后4h腹侧脊髓iNOS活性升高。结论:iNOS持续性高表达与Dyn致脊髓损伤机制有关 相似文献
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BACKGROUND: Electroacupuncture has promoting effects on the functional recovery of the injured spinal cord, can decrease pain, and elevate postoperative effect after acute spinal cord contusion.
OBJECTIVE: To observe the effect of electroacupuncture on apoptosis in the injured site after spinal cord contusion, and analyze its neuroprotective effects on neurological function in rats with spinal cord contusion.
METHODS: A total of 66 adult female Sprague-Dawley rats were randomly divided into: sham surgery group (n=20), spinal cord contusion group (n=20), electroacupuncture stimulation group (n=20) because six rats were excluded due to modeling failure and death. Before model establishment, at 1, 3 days, 1, 2, 3 and 4 weeks after model establishment, motor functions were evaluated by BBB score and the inclined plate test. At 3 days after model establishment, apoptosis of nerve cells could be detected in the site of injury in each experimental group using TUNEL assay. mRNA and protein expression of bax, bcl-2 and caspase-3 was detected surrounding the injury site using RT-PCR and western blot assay. Morphological changes in the site of injury could be observed using hematoxylin-eosin staining. The regeneration of nerve fibers was observed using HRP tracing.
RESULTS AND CONCLUSION: (1) Motor function score was significantly increased at various time points in the 2nd week of treatment in the electroacupuncture stimulation group than in the spinal cord contusion group (P < 0.05). (2) Apoptotic index was significantly lower in the electroacupuncture stimulation group than in the spinal cord contusion group at 3 days after model establishment (P < 0.05). (3) mRNA and protein expression of bax and caspase-3 was significantly lower in the electroacupuncture stimulation group than in the spinal cord contusion group at 72 hours (P < 0.05); bcl-2 gene and protein expression was significantly higher (P < 0.05). (4) The number of HRP-positive nerve fibers was highest in the sham surgery group, followed by electroacupuncture stimulation group, and lowest in the spinal cord contusion group at 4 weeks (P < 0.05). Results indicated that electroacupuncture plays a protective role on the spinal cord contusion by reducing apoptosis of nerve cells at the site of injury. 相似文献
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背景:大量临床和基础研究表明,电针能够改善骶上脊髓损伤后神经源性膀胱的功能。目的:观察电针对骶上脊髓损伤大鼠膀胱功能及结缔组织生长因子表达的影响。方法:将48只雌性SD大鼠随机分为4组,每组12只:空白组不做任何处理;假手术组仅暴露T8椎体下脊髓;模型组建立T8椎体下脊髓横断损伤模型;电针组建立T8椎体下脊髓横断损伤模型后第19天给予电针干预,选择“次髎”“中极”“三阴交”三穴,20 min/次,1次/d,连续干预10 d。干预结束后,进行相关指标检测。结果与结论:(1)尿流动力学检测:与空白组比较,模型组大鼠漏尿点压、膀胱最大容量、膀胱最大压力均升高(P <0.05);与模型组比较,电针组大鼠漏尿点压、膀胱最大容量、膀胱最大压力均下降(P <0.05);(2)苏木精-伊红染色:与空白组比较,模型组大鼠膀胱上皮细胞排列紊乱,固有膜被破坏,逼尿肌肌束肥大,肌纤维排列紊乱,组织水肿明显;与模型组比较,电针组大鼠膀胱上皮细胞排列相对规则有序,膀胱纤维化及组织水肿程度相对减轻;(3)Masson染色:模型组大鼠膀胱逼尿肌纤维化程度较重,电针组大鼠膀胱逼尿肌纤维化程度轻于模型组;(4... 相似文献