摘要
目的 :探讨应激对大鼠海马CA3区锥体细胞神经型一氧化氮合酶 (nNOS)和诱导型一氧化氮合酶 (i NOS)表达及海马匀浆液中亚硝酸盐 (NO- 2 ) /硝酸盐 (NO- 3)含量的影响及苯妥英钠对它们的效应。方法 :采用强迫游泳作为应激模型。利用免疫组织化学方法及计算机图像分析技术 ,定量测定各组大鼠海马CA3区神经元nNOS和i NOS的表达水平 ;采用硝酸还原酶法测定海马匀浆液中NO- 2 /NO- 3的含量。结果 :应激组大鼠海马CA3区锥体细胞nNOS表达的平均灰度值 (1 55 42± 3 77)显著低于对照组 (1 64 54± 4 62 )和应激给药组 (1 64 2 7± 2 55) (P <0 0 1 ) ;应激组iNOS表达的相对切面面积比 (5 87%± 2 90 % )显著高于对照组 (0 90 %± 0 89% )和应激给药组 (0 90 %±0 88% ) (P <0 0 1 ) ;应激组海马匀浆液中NO- 2 /NO- 3含量 (42 75μmol/L± 1 4 49μmol/L)显著高于对照组 (2 1 2 3μmol/L± 6 99μmol/L)和应激给药组 (1 8 40 μmol/L± 8 1 1 μmol/L) (P <0 0 1 ) ,后两组间差异无显著性。 结论 :应激可诱导海马CA3区锥体细胞nNOS和iNOS表达水平增加及海马中NO含量升高 ,苯妥英钠能阻止慢性应激所致的海马CA3区锥体细胞nNOS和iNOS异常表达 。
AIM: To investigate the changes in nNOS and iNOS expression of hippocampal CA3 pyramidal neurons and NO - 2/NO - 3 level of hippocampal homogenate of rats induced by stress, and to explore the effect of phenytoin on them. METHODS: Rats were subjected to forced-swimming stress, phenytoin was administered(ip) at 30 min before stress. Using the immunohistochemistry and the computerized image technique, the expression levels of nNOS and iNOS of rat hippocampal CA3 pyramidal neurons were assayed quantitatively, and the NO - 2/NO - 3 level of hippocampal homogenate was also measured using nitric acid deoxidize enzyme method. RESULTS: The nNOS average grey degree of hippocampal CA3 pyramidal neurons was significantly lower in stress group (155 42±3 77)than that in control group(164 54±4 62)and in stress plus phenytoin group(164 27±2 55)( P <0 01); The iNOS relative sectional area proportion of hippocampal CA3 pyramidal neuron was significantly larger in stress group(5 87%±2 90%) than that in control group (0.90%±0.89%) and in strers plus phenytoin groups (0 90%±0 88%)( P <0 01); The NO - 2/NO - 3 level of hippocampal homogenate was significantly higher in stress group(42 75 umol/L±14 49 umol/L)than that in control group(21 23 umol/L±6 99 umol/L)and in stress plus phenytoin group(18 40 umol/L±8 11 umol/L)( P <0 01). CONCLUSION: It is suggested that the stress could induce nNOS and iNOS expression in CA3 pyramidal neurons and excessive production of NO in hippocampus of rats, which could be inhibited by phenytoin.
出处
《中国病理生理杂志》
CAS
CSCD
北大核心
2002年第8期981-984,I004,共5页
Chinese Journal of Pathophysiology
关键词
苯妥英钠
应激
海马
一氧化氮
Stress
Hippocampus
Nitric oxide
Phenytoin
