中药平颤方加褪黑素对PD模型大鼠行为和前脑多巴胺及其代谢的影响

目的 观察中药平颤方加褪黑素(MT)对N-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)所致帕金森病(PD)模型大鼠行为学和前脑多巴胺(DA)及其代谢产物含量的影响,探讨中药与MT联合治疗PD的疗效及作用机制.方法 SD大鼠60只,分5个组:对照组、模型组、MT组、中药组、中药+MT组.模型组和各治疗组大鼠腹腔注射MPTP建立PD模型,用爬杆法和迷宫实验测量大鼠行为学改变和智力状况,用高压液相电化学法测定前脑DA、高香草酸(HVA)及二羟基苯乙酸(DOPAC)含量.结果 PD模型大鼠出现不同程度爬杆能力下降和智力减退,与模型组相比各治疗组大鼠行为学异常可部分改善(P＜0.01);模型组DA、HVA、 DOPAC含量均较对照组显著降低(P＜0.01),各治疗组DA、HVA、DOPAC含量较对照组低,但较模型组明显增高(P＜0.05,P＜0.01).结论 平颤方与MT联合通过调节大鼠前脑DA神经元活性从而改善PD症状.     

中药联合褪黑激素对帕金森模型大鼠前脑纹状体细胞凋亡和行为学的影响

目的 观察中药(平颤方)联合褪黑激素(MT)对帕金森病(PD)模型大鼠行为学和前脑纹状体细胞凋亡的影响,探讨中药联合MT治疗PD的作用及其机制. 方法 SD大鼠60只,分5个组:空白对照组、模型对照组、MT组、中药组、中药+MT组.模型对照组和各治疗组大鼠腹腔注射N-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)建立PD模型,用爬杆法和迷宫试验测量大鼠行为学改变和智力状况,Bax/Bcl-2免疫组织化学染色和Tunel法检测前脑纹状体凋亡细胞. 结果 PD大鼠出现不同程度爬杆能力下降和智力减退;与病理对照组相比,用药实验组尤其是中药+MT组大鼠行为学异常可部分或全部改善(P＜0.05),前脑纹状体神经元和胶质细胞Bcl-2蛋白表达明显增强(P＜0.01),Bax基因表达受抑制(P＜0.01),同时前脑黑质纹状体通路细胞凋亡减少(P＜0.01).结论 中药平颤方联合MT通过抗氧化应激途径,激活Bax/Bcl-2系统,调节前脑黑质纹状体通路多巴胺(DA)神经活性,抑制细胞凋亡和改善PD症状.     

钩藤碱对帕金森大鼠脑内SOD、DA、MDA表达的调节作用

目的探讨钩藤碱在帕金森病（PD）大鼠模型中对纹状体多巴胺（DA）、超氧化物歧化酶（SOD）、丙二醛（MDA）水平表达的调节作用。方法首先从中药钩藤中分离提取出钩藤碱。其次采用脑内定位注射6-OHDA制备部分损伤PD大鼠模型,大鼠随机分为3组（各组10只大鼠）,分别为正常对照组、模型对照组、钩藤碱组。用生化法对大鼠脑中DA及血清中SOD、MDA活性进行测定,分析钩藤碱对其活性的影响。结果给药30d后,钩藤碱组DA水平密度明显高于模型对照组（P〈0.01）。在SOD水平方面,钩藤碱组显著高于模型对照组（P〈0.05）;而MDA含量,钩藤碱组与正常对照组接近,但显著低于模型对照组（P〈0.05）。结论钩藤碱对帕金森大鼠脑内SOD、DA、MDA表达的具有调节作用,提示其作为帕金森症的治疗或者预防药物具有一定的开发价值。     

止颤汤对神经干细胞移植后帕金森病大鼠尿液中DA及其代谢产物含量的影响

目的 观察止颤汤对神经干细胞(NSC)移植后帕金森病(PD)大鼠尿液中多巴胺(DA)及其代谢产物含量的影响,探讨其对NSC移植后存活及定向分化的作用.方法 1-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)脑内定向注射建立PD大鼠模型,经NSC移植后予止颤汤灌胃.应用高效液相色谱法(HPLC)测定PD大鼠尿液中DA及其代谢产物高香草酸(HVA)、双羟苯乙酸(DOPAC)的含量.结果 止颤汤可以提高NSC移植后PD大鼠尿液中DA及其代谢产物的含量并改善其行为学.结论 止颤汤可能促进PD大鼠脑内NSC移植后的存活,并且分化为多巴胺能神经元发挥功能,同时抑制DA排泄,从而达到治疗作用.     

针药结合疗法对帕金森病模型小鼠纹状体区多巴胺D1、D2受体活性的影响

目的探讨针药结合疗法对帕金森病(PD)模型小鼠纹状体区多巴胺D1、D2受体活性的影响。方法将C57B L/6雄性小鼠随机分为正常组、模型组、针刺组、中药组、西药组及针药结合治疗组,每组再随机分为7天组(n=7)和14天组(n=7),应用腹腔内注射(MPTP)的方法制备PD模型小鼠。针刺组针刺百会、运动前区(双侧)、哑门;西药治疗组灌胃美多巴;中药组灌胃中药PD方;针药结合组针刺和中药同时施行,方法同中药组和针刺组。用免疫组化法观察治疗后PD模型小鼠脑内纹状体区多巴胺(DA)D1、D2受体活性的影响。结果针药结合组、西药治疗组小鼠脑内纹状体区DA的D1、D2受体活性与模型组比较,差异有统计学意义(P0.01)。西药治疗PD模型小鼠,其模型小鼠纹状体区D1、D2受体活性改善最佳,最接近正常组D1、D2受体活性指标。针药结合治疗改善PD模型小鼠纹状体区D1、D2受体活性优于单纯中药治疗及针刺治疗。结论西药美多巴治疗PD,改善该病多巴胺D1、D2受体活性且具有明显优势,针药结合对PD的治疗优于传统单纯中药治疗及针刺治疗。     

99mTc-TRODAT-1放射自显影对帕金森病大鼠模型多巴胺转运蛋白的观察

目的　探讨 99m Tc- TRODAT- 1多巴胺转运蛋白 (DAT)显像临床应用价值。　方法　应用 6 -羟基多巴胺 (6 - OHDA)建立完全损毁及部分损毁一侧帕金森病 (PD)大鼠模型 ,以 99m Tc-TRODAT- 1作为配体 ,采用放射自显影观察一侧 PD大鼠模型 DAT分布及其密度 ,高效液相 -电化学方法检测模型大鼠纹状体多巴胺 (DA)及其代谢产物含量 ,免疫组化酪氨酸羟化酶 (TH)染色观察模型大鼠黑质及纹状体 TH阳性细胞及纤维。　结果　 6 - OHDA损毁侧纹状体放射性浓集明显低于未损毁侧 ,完全损毁模型的纹状体放射性浓集最低。纹状体 DA含量部分损毁及完全损毁较未损毁侧分别降低 39%和 98%。TH染色可见损毁侧黑质及纹状体 TH阳性细胞及纤维明显少于对侧。　结论　 PD大鼠模型损毁侧纹状体 DAT密度降低 ,且与损毁程度有关。99m Tc- TRODAT- 1DAT显像研究可能有助于 PD的早期诊断。     

电针与锌合用对帕金森病模型大鼠DA能神经元恢复的调节

目的 探讨电针与小剂量锌合用对帕金森病(PD)模型大鼠DA能神经元结构和功能恢复的调节作用.方法 选取SD大鼠100只,将6-羟基多巴胺注入中脑右侧黑质制备单侧黑质损毁的PD大鼠模型,将模型大鼠随机分成模型组、0Hz组和120 Hz电针组、120 Hz+锌组和锌组,另设有假手术组,共6组.治疗或观察6个星期,观察治疗前后PD模型大鼠行为学变化,黑质酪氨酸羟化酶(TH)阳性细胞的形态、数量以及黑质多巴胺能神经元凋亡的情况.结果 与模型组比较,锌组、120 Hz组以及120 Hz+锌组大鼠行为学明显改善(P＜0.05或0.01),大鼠损毁侧TH阳性神经元数明显增加,DA能神经元凋亡数显著减少(P＜0.05或0.01).与120 Hz组比较,120 Hz+锌组大鼠损毁侧黑质TH阳性神经元数的增加及凋亡细胞百分比的减少也有统计学意义(P＜0.05).结论 电针与小剂量锌合用治疗PD模型大鼠在使DA能神经元结构和功能恢复方面具有较好的神经保护作用.     

人14-3-3γ基因转移对帕金森病大鼠多巴胺能神经元的保护作用

目的 探讨14-3-3γ转基因疗法对帕金森病模型大鼠的治疗作用及可能机制. 方法 用携带人14-3-3γ基因的重组腺病毒(Ad)感染帕金森病大鼠模型纹状体后,采用免疫组化方法检测纹状体与黑质酪氨酸羟化酶(TH)的表达、免疫印迹技术检测Caspase 3及14-3-3γ蛋白的表达、高效液相色谱法检测纹状体DA及其代谢产物DOPAC含量变化,并对PD大鼠的旋转行为进行评分. 结果 Ad/14-3-3γ注射PD大鼠纹状体后14-3-3 γmRNA及蛋白均能过表达.Ad/14-3-3γ组黑质TH免疫反应阳性的细胞数和纹状体TH免疫反应阳性的神经纤维光密度值与正常对照侧的比值(0.47±0.12和0.61±0.14)显著高于PBS组(0.16±0.13和0.25±0.12)和LacZ组(0.15±0.09和0.27±0.11)(均P＜0.01).Ad/14-3-3 γ组注射侧大鼠纹状体区DA含量与对侧比值为0.37±0.14,显著高于PBS组(0.15±0.08,P=0.006)和LacZ组(0.19±0.11,P=0.007);其代谢产物DOPAC含量与对侧比值Ad/14-3-3γ组(0.34±0.12)也高于对照组(PBS组为0.13±0.10,LacZ组为0.16±0.09,均P=0.00).Ad/14-3-3γ组注射侧纹状体中Caspase-3的表达与对侧相比显著降低.行为学评估结果显示Ad/14-3-3γ组大鼠平均旋转次数在第2次注射后的第1周、第2周和第6周均低于PBS组和LacZ组(均P＜0.01);而PBS组和LacZ组相比,两组的旋转次数在上述三个时间点均差异无统计学意义(P=0.764,0.779和0.742). 结论 14-3-3γ对PD模型大鼠的多巴胺能神经元有保护作用,是PD基因治疗中非常有前景的候选基因.     

铁剂诱发黑质多巴胺能神经元变性

目的 探讨铁剂对黑质多巴胺（DA）能神经元的毒性作用，为阐明帕金森病（PD）发病机制提供资料。方法 将铁剂定向注射至大鼠一侧黑质，6周后通过酪氨酸羟化酶（TH）免疫组化染色观察黑质DA能神经元的损伤情况，高压液相色谱－电化学法（HPLC－ECD）检测DA及其代谢产物含量，化学分光比色法检测中脑自由基代谢变化。结果 大剂量铁剂（40μg)可诱发大鼠黑质TH阳性细胞显著变性、丢失，纹状体DA及其代谢产物含量显著降低，中脑脂质过氧化产物丙二醛（MDA）升高、谷胱甘肽（GSH)含量降低。小剂量铁剂（4μg）无明显致TH阳性细胞丢失作用，但也可使中脑MDA升高。结论 铁剂可造成中脑黑质DA能神经元变性丢失，铁介导的自由基生成增加在PD发病过程中起重要作用。     

天麻钩藤饮对帕金森病大鼠神经行为学及氧化应激反应的影响

目的 观察天麻钩藤饮对帕金森病(PD)大鼠神经行为学及氧化应激的影响.方法 采用6羟基多巴胺(6-OHDA)注射于脑右侧黑质造成单侧PD损毁模型,并用中药天麻钩藤饮(浓度为5.13 g/ml)进行治疗,共给药14 d.同时设立正常对照组、假手术组,观察各组大鼠神经行为学的变化,同时运用化学比色法测定大鼠中脑黑质、纹状体部位活性氧、谷胱甘肽(GSH)、谷胱甘肽过氧化物酶(GSH-Px)、超氧化物歧化酶(SOD)、丙二醛(MDA)的活性.结果 神经行为学方面,模型组大鼠治疗前后旋转圈数无显著差异;天麻钩藤饮组大鼠旋转圈数较模型组显著减少(P＜0.05),且治疗前后比较差异显著(P＜0.05);模型组活性氧、MDA明显升高,GSH、GSH-Px、SOD明显降低,与正常对照组、假手术组比较,差异显著(P＜0.05或P＜0.01);而天麻钩藤饮对其均有明显的改善作用(P＜0.05).结论 天麻钩藤饮可以明显改善PD大鼠的神经行为学变化,并可以提高机体的抗氧化和清除自由基的能力.     

EVIDENCE FOR A HYPOTHALAMIC ALTERATION OF CATECHOLAMINE METABOLISM IN POLYCYSTIC OVARY SYNDROME

The role of brain catecholamine (CA) activity in the neuroendocrine regulation of the GnRH-LH system in polycystic ovary syndrome (PCO) was investigated by high-performance liquid chromatography (HPLC) with electrochemical detector. We measured urinary dopamine (DA), noradrenaline (NA), adrenaline (A), vanillylmandelic acid (VMA), homovanillic acid (HVA), 3,4-dihydroxyphenylacetic acid (DOPAC) and total 3-methoxy-4-hydroxyphenylglycol (MHPG) levels in a group of 12 women with PCO before and during peripheral dopa-decarboxylase blockade, by carbidopa. HVA and DOPAC concentrations were significantly lower (P less than 0.001 and P less than 0.005, respectively) in PCO patients compared with twelve control subjects in early follicular phase, whereas total MHPG concentrations and MHPG/VMA ratio were significantly higher (P less than 0.005) in PCO patients. Moreover, HVA and DOPAC concentrations in PCO patients were similar to those of the control subjects in preovulatory phase, while MHPG concentrations remained higher in PCO patients (P less than 0.01). DA, NA, A and VMA concentrations were similar to those of control subjects in both phases of the cycle. During carbidopa administration the concentrations of all urinary CAs and metabolites were unchanged, except those of DA which dropped markedly (P less than 0.001). These data suggest that (1) an altered central catecholamine metabolism consisting of DA deficiency and NA excess is present in PCO, and (2) the site of DA deficiency may be located in the hypothalamus.     

Evidence for a physiological reduction in brain dopamine but not norepinephrine metabolism during the preovulatory phase in normal women

To investigate the role of brain catecholamine (CA) activity in the mechanisms related to physiological ovulatory function, we used high-performance liquid chromatography with electrochemical detector to measure the levels of urinary dopamine (DA), norepinephrine (NE), epinephrine (E), vanillylmandelic acid (VMA), homovanillic acid (HVA), 3,4-dihydroxyphenylacetic acid (DOPAC), and total 3-methoxy-4-hydroxy-phenylglycol (MHPG) in a group of 12 normal women during both the early follicular and pre-ovulatory phases of the menstrual cycle. The mean (+/- SEM) concentrations of HVA and DOPAC were significantly lower (P less than 0.001) during the pre-ovulatory phase than during the early follicular phase, whereas those of DA, NE, E, VMA and total MHPG were unaltered. A significant negative correlation between urinary HVA and plasma LH (r = -0.70, P less than 0.01) was also found during the pre-ovulatory period, whereas no significant negative correlations were found between urinary HVA and plasma PRL, progesterone and oestradiol. These data show: 1) reduced brain DA activity and 2) unchanged brain NE activity at the time of the midcycle surge in normal women, suggesting a physiological variation of the central DA metabolism in ovulatory function.     

骨化三醇对MPTP诱导慢性帕金森病小鼠模型脑内神经递质的影响

目的探讨骨化三醇对1-甲基-4-苯基-1,2,3,6-四氢吡啶（MPTP）诱导慢性帕金森病小鼠模型脑内氨基酸类和单胺类神经递质的影响。方法C57BL／6小鼠随机分为对照组、模型组、骨化三醇高剂量给药组和低剂量给药组,构建MPTP慢性模型,应用高效液相色谱法测定中脑及纹状体内氨基酸类神经递质,包括天冬氨酸（Asp）、谷氨酸（Glu）、甘氨酸（Gly）、牛磺酸（Tau）、1,-氨基丁酸（GABA）和单胺类神经递质,包括多巴胺（DA）及其代谢产物3,4-双羟苯乙酸（DOPAC）的含量。结果与对照组相比,模型组小鼠氨基酸类神经递质除中脑内GABA外含量增加,纹状体内DA和DOPAC含量降低,代谢率增加俨〈O．01或P〈0．05）。骨化三醇给药组与模型组相比,高剂量可使中脑GIu,Gly,Tau及纹状体内五种氨基酸含量降低,DA和DOPAC含量增加,代谢率降低俨〈O．01或P〈0．05）;低剂量则仅可减缓中脑Tau和纹状体除Tau以外其他4种氨基酸含量增长状况。结论骨化三醇能改善MPTP所致慢性PD小鼠模型脑内神经递质含量异常,直接或间接保护DA能神经元,对其机制的深入研究有助于新型神经保护药物的开发。     

Association between Low Contents of Dopamine and Serotonin in the Nucleus Accumbens and High Alcohol Preference

The contents of dopamine (DA), 3,4-dihydroxyphenylacetic acid (DOPAC), homovanillic acid (HVA), serotonin (5-HT), and 5-hydroxy-indoleacetic acid (5-HIAA) were determined in the nucleus accumbens (ACB), frontal cortex (FR), anterior striatum (AST), and hippocampus (HIP) of adult male rats from the F₂ generation of P×NP intercrosses. Rats were tested for their alcohol preference and were divided into two groups, depending on their alcohol intake. Rats in the high drinking group ( n = 11) had ethanol intakes >5 g/kg/day, whereas the low drinking group ( n = 15) had values < 1 g/kg/day. The content of DA in the ACB was lower ( p < 0.001) in the high alcohol drinking group (46 ± 2 pmol/mg tissue) than in the low intake rats (61 ± 3 pmol/mg tissue). However, the contents of DOPAC and HVA in the ACB were similar for both groups. There were no differences between the two groups in the contents of DA in the FR or AST. The content of 5-HT in the ACB was lower (p < 0.05) in high alcohol drinking rats (6.3 ± 0.3 pmol/mg tissue) than in the low intake group (7.0 ± 0.2 pmol/mg tissue). The content of 5-HIAA in the ACB of the high intake rats was also lower than the level for the low drinking rats. There were no differences in the contents of 5-HT or 5-HIAA in the FR, HIP, and AST between the two groups. The results confirm a phenotypic association between abnormal DA and 5-HT systems projecting to the ACB and high alcohol drinking behavior in the P line of rats.     

The Effect of Ethanol on the Brain Catecholamine Systems in Female Mice, Rats, and Guinea Pigs

The effect of acute ethanol administration on the concentrations of dopamine (DA), norepinephrine (NE) and their metabolites (3,4-dihydroxyphenylacetic acid [DOPAC], homovanillic acid [HVA], 3,4-dihydroxyphenylglycol [DHPG] and 4-hydroxy-3-methoxyphenylglycol [HMPG]) in brains of female mice, rats, and guinea pigs were investigated. A subhypnotic dose (2 g/kg) or a hypnotic dose (4 g/kg) of ethanol was administered intraperitoneally and the animals were killed 45 min later. In the rat the DA levels were unchanged, while the NE concentrations were decreased after both doses of ethanol. The DA levels did not change in the mouse and guinea pig, while the concentrations of NE showed a minor decrease in the mouse but were unaffected in the guinea pig. After 4 g/kg of ethanol the DOPAC and HVA concentrations were elevated significantly in all three species, and after 2 g/kg the DOPAC levels were increased in the rat and guinea pig brains and the HVA levels in the mouse and guinea pig brains. In the mouse and rat brain the DOPAC + HVA concentrations indicated a dose response relationship: 4 g/kg was significantly more effective than 2 g/kg. The DHPG concentration increased in the rat brain after both 2 and 4 g/kg, while the HMPG concentrations increased significantly only after 2 g/kg. In the mouse and guinea pig the brain DHPG concentrations remained unchanged, while the HMPG concentrations increased after both 2 and 4 g/kg ethanol. These data suggest, that the turnover of both DA and NE was increased 45 min after a subhypnotic as well as after a hypnotic dose of ethanol in all three species studied.(ABSTRACT TRUNCATED AT 250 WORDS)     

Changes in brain monoamine metabolism in rats with acute ischemic hepatic failure under artificial cardiopulmonary management.

A study was conducted to investigate changes in monoamine metabolism in the brain of rats with acute ischemic hepatic failure (AHF) induced by two-stage hepatic devascularization. Strict artificial cardiopulmonary management was used to exclude possible confounding effects of hypotension, hypothermia and hypoxemia that often appear in AHF. Rats were put in an incubator at 34 degrees C before the ligation of the hepatic artery (second stage operation), tracheotomized and ventilated artificially throughout the remaining experimental periods. No significant difference was observed in physiological parameters, including body temperature, pulse rate and systolic arterial blood pressure or PaO2 between AHF and sham operated rats. Brain levels of norepinephrine (NE) and its metabolite 3-methoxy-4-hydroxyphenylglycol (MHPG), dopamine (DA) and its metabolites 3,4-dihydroxyphenylacetic acid (DOPAC) and homovanilic acid (HVA), and serotonin (5-hydroxytryptamine, 5HT) and its metabolite 5-hydroxyindoleacetic acid (5HIAA) were determined by HPLC-voltametry. AHF rats showed significantly higher MHPG, DOPAC, 5HIAA and lower NE levels in the brain compared to controls. In addition, a significant negative correlation between NE and tyrosine (Tyr), a significant positive correlation between MHPG and Tyr or phenylalanine (Phe), and a significant positive correlation between DOPAC and Tyr or Phe were observed. In conclusion, the changes in monoamine metabolism in the brain of AHF rats are clearly induced specifically by hepatic failure itself, possibly through an altered metabolism of amino acids.     

Melatonin disrupts circadian rhythms of glutamate and GABA in the neostriatum of the aware rat: a microdialysis study

The purpose of this study was to investigate possible circadian changes in extracellular concentrations of glutamate (GLU) and gamma-aminobutyric acid (GABA). and the influence of melatonin on the levels of these neurotransmitters in the neostriatum of awake rats using in vivo microdialysis. At the same time, the concentrations of the amino acids taurine (TAU), glutamine (GLN) and arginine (ARG), as well as dopamine (DA) and its metabolites 3, 4-dihydroxyphenyl acetic acid (DOPAC) and homovanillic acid (HVA), were measured in the extracellular fluid. When dialysates were collected over a 24-hr period (6 hr dark, 12 hr light, 6 hr dark), both GLU and GABA, without the infusion of melatonin, exhibited statistically significant rhythms, with higher levels of these constituents during the dark and lower levels during the day. Perfusion with melatonin (for 19 consecutive hours) prevented the daytime reductions in both GLU and GABA. Of the amino acids measured in the dialysates collected from the neostriatum of non-perfused rats, only ARG exhibited a significant change during the light:dark cycle; again, lowest concentrations were measured during the day. While melatonin perfusion did not statistically significantly influence neostriatal levels of TAU and ARG, GLN levels continued to drop during the infusion of the indoleamine. Dialysate concentrations of DA, DOPAC and HVA exhibited circadian rhythms which were not influenced by melatonin perfusion. The findings indicate there are differential effects of melatonin on extracellular neurotransmitter concentrations in the neostriatum of the awake rat. The results also suggest that the day:night variations in GLU and GABA may relate to daily changes in endogenous melatonin production, while DA and its metabolites are minimally influenced by this secretory product.     

焦虑大鼠内脏敏感性增高以及行直结肠扩张后血清皮质酮的变化及意义

目的内脏高敏感性是肠易激综合征( 1BS)症状最重要的病理生理机制之一,焦虑可能与内脏高敏的发生密切相关。本研究旨在探讨焦虑对大鼠直结肠敏感性的作用以及血清皮质酮与内脏高敏的关系。方法Wistar大鼠随机分为对照组和焦虑组两组,通过对大鼠行空瓶刺激2周建立以焦虑为主要表现的慢性情绪应激模型。造模期间,观察大鼠的攻击、探究和修饰三种行为,对其进行情绪性行为学分析。造模结束后,以腹部回缩反射(AWR)评分为指标观察大鼠对直结肠气囊扩张(CRD)的反应性,评估内脏敏感性。然后将两组各随机分为扩张组和非扩张组,对扩张组行CRD ,并取血清,对血清皮质酮定量测定。结果空瓶刺激期间,同对照组相比,焦虑组探究、攻击行为明显增多,修饰行为减少(P <0 0 1)。焦虑组在2 0mmHg、40mmHg、60mmHg和80mmHg的扩张压力下的AWR评分均显著高于对照组(P <0 0 1)。焦虑组与对照组相比血清皮质酮水平明显升高(P <0 0 1) ,但各组扩张后皮质酮水平较扩张前仅有轻微升高,无显著差异(P >0 0 5 )。结论焦虑对IBS内脏高敏起一定作用,其发挥作用的机制可能并非单一通过下丘脑_垂体_肾上腺皮质系统(HPA轴)来实现,推测还可能与脑内单胺类神经递质NE浓度的改变有关。     

首乌益智灵对血管性痴呆模型大鼠脑组织SOD活性、MDA含量的影响

目的观察首乌益智灵对血管性痴呆(VD)模型大鼠脑组织SOD活性、MDA含量的影响,并探讨其对血管性痴呆的干预机理。方法用改良Pulsinelli四血管阻断(4-VO)法制造血管性痴呆大鼠模型,设首乌益智灵组、脑复康组、模型组、假手术组,分别测定干预后各组大鼠脑组织中的超氧化物歧化酶(SOD)活性、丙二醛(MDA)含量。结果灌胃20 d后,首乌益智灵组大鼠脑组织中的SOD活性显著提高、MDA含量显著降低,与模型组和脑复康组相比有显著差异(P<0.05,P<0.01)。结论首乌益智灵具有提高VD大鼠脑组织中的SOD活性、降低MDA含量的作用,这可能是其治疗血管性痴呆的主要作用机制之一。