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1.
目的:探讨绞股蓝总苷(gypenosides,GP)对谷氨酸(glutamic acid,Glu)诱导的胎鼠大脑皮层神经元损伤的保护作用,并从信号通路角度探讨其作用机制。方法:以体外培养的13~14?d胎鼠大脑皮层神经元为研究对象,建立谷氨酸损伤和GP保护模型。采用MTT法测定细胞的存活率;荧光染料Ho33342和碘化丙碇(PI)荧光双染法鉴定细胞死亡方式;硝酸还原法测定细胞培养上清液中NO含量;生化法检测H2O2含量;流式细胞仪检测线粒体膜电位变化,分析GP对谷氨酸氧化性神经损伤的保护机制。结果:谷氨酸可导致神经细胞发生凋亡和坏死两种死亡方式;GP(200?μg/ml)可明显抑制谷氨酸引起的NO、H2O2含量的升高,有效地防止线粒体膜电位的下降,从而提高细胞存活率。结论:GP可明显拮抗谷氨酸介导的氧化性神经损伤,提高细胞的存活率,其机制可能与提高神经细胞内抗氧化酶活性,清除氧自由基对线粒体膜的损伤有关。  相似文献   

2.
目的研究绞股蓝皂苷(gypenosides,GP)含药血清对谷氨酸(glutamic acid ,Glu)诱导的氧化性神经损伤的保护作用。方法采用中药血清药理学方法,收集GP含药血清,以体外培养的胎鼠大脑皮层神经元为研究对象,采用倒置相差显微镜观察细胞形态;MTT法测定细胞存活率;Ho33342/PI荧光双染法鉴定细胞死亡方式;生化法检测细胞内超氧化物歧化酶(Super Oxide Dismutase,SOD)活性和谷胱甘肽(L-Glutathione,GSH)含量;流式细胞仪测细胞内游离Ca2+变化,综合评价GP含药血清对谷氨酸氧化性神经损伤的保护作用。结果谷氨酸可导致神经细胞发生凋亡和坏死;GP含药血清能明显拮抗谷氨酸的细胞损伤作用,提高细胞的存活率,维持细胞内较高GSH含量和SOD活性,抑制细胞内游离Ca2+浓度的升高。结论GP含药血清能明显拮抗Glu诱导的氧化性神经毒性,以400mg· kg-1·d-1GP灌胃含药血清作用最显著。  相似文献   

3.
绞股蓝总皂苷对谷氨酸所致大鼠海马组织损伤的保护作用   总被引:1,自引:0,他引:1  
目的探讨绞股蓝总皂苷(gypenosides, GP)对大鼠侧脑室注射谷氨酸(glutamate, Glu)引起的海马组织氧化损伤的保护作用。方法将大鼠随机分为假手术组、Glu损伤组、GP低(200mg/kg)、中(400mg/kg)、高(800mg/kg)剂量组。GP组预先灌胃给药10d。大鼠经侧脑室注射Glu后2h取脑,测定各组大鼠海马组织匀浆中的丙二醛(MDA)含量、超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px) 活性及产生羟自由基的能力;制备海马组织切片,观察各组形态学变化。结果Glu损伤组大鼠海马组织中MDA含量和羟自由基生成能力均高于假手术组(P<0.05),而SOD和GSH-Px活性降低(P<0.05);与Glu损伤组比较,GP组MDA含量和产生羟自由基的能力降低(P<0.01),SOD和GSH-PX活性明显增强(P<0.01);HE染色显示, GP组海马神经元变性及坏死较Glu损伤组明显减少。GP 400mg/kg对Glu所致海马组织氧化损伤的保护作用最为明显。结论GP通过增强抗氧化酶活性,抑制羟自由基和脂质过氧化物生成而减轻Glu介导的氧化性神经损伤,发挥神经保护作用。  相似文献   

4.
米帕明对谷氨酸损伤中枢神经细胞的保护作用   总被引:1,自引:0,他引:1  
目的研究米帕明(Imi)对谷氨酸损伤培养大鼠皮层神经细胞的保护作用.方法分离培养15~18 d胎龄的大鼠神经细胞,加入谷氨酸(Glu),观察谷氨酸对神经细胞的损伤作用及米帕明的保护作用.结果加入谷氨酸后,神经细胞出现明显损伤性变化,死亡率升高,培养上清液中乳酸脱氢酶(LDH)、一氧化氮(NO)含量增加,细胞匀浆中丙二醛(MDA)生成增加,超氧化物歧化酶(SOD)含量明显减少.Imi能不同程度地减轻上述损伤性变化.结论 Imi对谷氨酸所致的神经细胞损伤具有保护作用,其作用机制可能与钙拮抗作用有关.  相似文献   

5.
谷氨酸(glutamate,Glu)的兴奋毒性已被证实对神经细胞具有损伤作用。研究发现Glu的兴奋毒性导致神经细胞损伤在多种神经系统疾病的发病过程中起着重要作用,而雌激素对Glu毒性导致的神经细胞损伤具有保护作用,该作用可能是通过雌激素受体(estrogen receptor,ER)介导完成的。本文就雌激素及其受体对Glu诱导的神经细胞损伤的作用研究作一综述。  相似文献   

6.
目的:研究神经毒性物质β-淀粉样肽(β-AP)?N-甲基-D-天冬氨酸(NMDA)对原代培养鼠脑皮层神经细胞的致凋亡损伤和维生素E可能的神经保护作用?方法:通过形态学观察和MTT自动比色法检测存活细胞率;用DNA电泳和流式细胞技术分析细胞凋亡率;用免疫细胞化学技术分析细胞凋亡相关基因表达?结果:经β-AP?NMDA作用后,培养神经细胞出现明显的细胞凋亡特征:存活细胞减少,凋亡细胞数增多及特征性DNA断裂带,神经细胞凋亡相关蛋白Bcl-2表达下降?Bax表达上升(均P<0.05)?加维生素E组细胞则表现以上凋亡特征减弱?结论:神经毒性物质β-AP?NMDA可诱导培养神经细胞凋亡,细胞凋亡机制与氧化损伤相关,维生素E可减缓细胞凋亡?  相似文献   

7.
目的应用磷脂酰肌醇3位羟基激酶(PI3K)的特异性阻断剂LY294002,研究PI3K/Akt信号转导通路在绞股蓝皂苷(GPs)拮抗谷氨酸(Glu)诱导胎鼠大脑皮层神经元氧化性损伤中的作用。方法以体外原代培养的14~15d胎鼠大脑皮层神经元为研究对象,用相差显微镜进行形态学观察,MTT法检测神经元存活率,流式细胞仪检测神经元凋亡率,Western blot法检测磷酸化Akt和总Akt的表达,分析PI3K/Akt信号转导通路在GPs拮抗Glu诱导神经元氧化性损伤中的作用。结果 GPs可抑制Glu诱导的胎鼠大脑皮层神经元氧化性损伤,使神经元存活率上升,凋亡率降低,磷酸化Akt表达增加,PI3K的特异性抑制剂LY294002明显抑制了GPs对神经元的保护作用。结论绞股蓝皂苷激活了PI3K/Akt信号转导通路,拮抗谷氨酸诱导的胎鼠大脑皮层神经元氧化性损伤。  相似文献   

8.
羟基红花黄色素A抗谷氨酸氧化性神经损伤的保护作用   总被引:3,自引:0,他引:3  
目的研究羟基红花黄色素A(HSYA)对谷氨酸(Glu)诱导的氧化性神经损伤的保护作用。方法以体外原代培养Wistar胎鼠大脑皮层神经元为实验材料,进行形态学观察,采用噻唑蓝(MTT)比色法、Hoechst33342/PI双荧光探针染色、超氧化物歧化酶(SOD)和谷胱甘肽(GSH)含量检测、流式细胞仪分析细胞凋亡率以及免疫细胞化学法检测细胞色素C(CytC)荧光强度,综合评价HSYA对Glu氧化性神经损伤的保护作用。结果与Glu损伤组相比,HSYA能显著提高细胞相对存活率,维持细胞内较高SOD和GSH水平,降低Glu引起的细胞凋亡率及线粒体内CytC向胞质的释放,以160μg/mL浓度的 HSYA保护效果最为显著。结论HSYA对Glu氧化性神经损伤有显著的保护作用,其机制与抗氧化、抑制细胞凋亡有关。  相似文献   

9.
目的:探讨抗抑郁药物奥氮平对谷氨酸(Glu)损伤的大鼠海马神经元凋亡、坏死和细胞周期的影响,阐明奥氮平神经保护作用的机制。方法:采用体外原代培养的大鼠海马神经元,复制Glu损伤模型,细胞分为正常对照组、Glu损伤组和奥氮平+Glu损伤组,在体外通过流式细胞术测定各组神经元细胞凋亡率、坏死率和细胞周期的改变。结果:与正常对照组比较,其他组细胞凋亡率增加 (P<0.01);与Glu损伤组比较,10.0 μmol/L奥氮平+Glu损伤组细胞凋亡率降低(P<0.01 )。与正常对照组比较,Glu损伤组神经元坏死率升高2.9倍 (P<0.05);与Glu损伤组比较,100.0和200.0 μmol/L奥氮平+Glu损伤组神经元坏死率降低(P<0.05或P<0.01)。与正常对照组比较,Glu损伤组G0/G1期细胞百分数增加 (P<0.01),S期细胞百分数下降(P<0.01),G2 + M期变化不明显;而与Glu损伤组比较,
50.0和100.0 μmol?L-1奥氮平+Glu损伤组G0/G1期细胞比例下降为Glu损伤组的79.9%和62.6% (P<0.05或P<0.01);S期细胞比例上升为Glu损伤组的2.5和3.8倍 (P<0.05或P<0.01)。结论:奥氮平能够抵抗Glu诱导的神经元凋亡和坏死,改变细胞周期进程。  相似文献   

10.
【目的】探讨银杏内酯B拮抗谷氨酸诱导的体外培养新生大鼠视网膜神经细胞凋亡作用及其可能的机制。【方法】MTT法检测不同浓度谷氨酸对原代培养sD大鼠视网膜神经细胞的兴奋性毒性作用。细胞分为正常组、谷氨酸组和不同浓度(10、50、100μmol/L)银杏内酯B治疗组(n=6)。MTT法检测不同浓度的银杏内酯B对谷氨酸诱导凋亡的视网膜神经细胞存活率的影响。流式细胞仪结合AnnexinV/PI检测细胞凋亡率,JC-1染色检测线粒体膜电位。【结果】100μmol/L谷氨酸作用下,视网膜神经细胞的吸光度值降低至0.50&#177;0.07,凋亡率为52.4%,JC-1的红/绿比值为1.77。10~100μmol/L银杏内酯B作用下神经细胞的吸光度值分别为0.52&#177;0.09、0.64&#177;0.15和0.74&#177;0.11,细胞的凋亡率分别下降至36.7%,12.4%和2.1%,JC-1的红/绿比值则分别上升为1.898、2.089、2.276(P〈0.05)。【结论】银杏内酯B可以拮抗谷氨酸诱导的视网膜神经细胞凋亡。其作用机制可能与提高线粒体膜机能有关。  相似文献   

11.
Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P < 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (>0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P <0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P < 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.  相似文献   

12.
Objective: To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods: SD rats served as both donors and recipients. 4℃ sodium lactate Ringer's was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava (IVC) inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results: Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion: This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.  相似文献   

13.
Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P< 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P< 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.  相似文献   

14.
目的:评价使用安心颗粒对急诊经皮冠状动脉介入术(PPCI)术后生活质量的影响.方法:将160例接受PPCI的急性ST段抬高型心肌梗死患者随机分为安心颗粒组(术前顿服安心颗粒8.8g,术后安心颗粒4.4 g/次,每日2次)和对照组(仅接受基础药物治疗).所有患者均服用阿司匹林、氯吡格雷和阿托伐他汀.分别在入院时、出院前1d、出院后180 d时,应用心肌梗死多维度量表(MIDAS)、中文版SF-36评价量表对患者生活质量评分.并观察术后30 d以内的出血并发症、血小板减少症发生情况.结果:入院时和出院前1d,两组患者的心肌梗死MIDAS、SF-36量表评分比较无差异(P>0.05);出院后180 d时,与对照组比较,安心颗粒组MIDAS、SF-36评分明显减低(P<0.05);组内与入院时比较,两组出院前1d、出院后180 d时,MIDAS、SF-36评分均降低(P<0.05).两组患者在随访期间均无大量出血、少量出血、重度和极重度血小板减少症发生,安心颗粒组有4例、对照组有7例发生不明显出血(P>0.05).两组发生轻度血小板减少症的患者数比较无差异(P>0.05).结论:PPCI使用安心颗粒,能改善急性ST段抬高型心肌梗死患者的生活质量,且不增加出血风险.  相似文献   

15.
Objective:To investigate the influences of urapidil and nicardipine on rabbit sinus function,atrio-ventricular node function and hemodynamics.Methods:Thirty-two Angora's rabbits were selected and randomly divided into four groups.U1 group:urapidil 0.25 mg/kg;U2 group:urapidil 0.5 mg/kg;N1 group:nicardipine 10 μg/kg;N2 group:nicardipine 20 μg/kg.All these medicine were administrated within 30 seconds.Measurements were taken before and after the administration of urapidil or nicardipine for the following data:mean blood pressure(MAP),heart rate(HR),sino-atrial conduction time(SACT),maximal sinoatrial recovery time(SNRTmax)corrected sinus node recovery time(CSNRT),index of sinus node recovery time(SNRTI),Wenckebach A-V conduction frequency (WB),and P-R interval.Results:Significant MAP and HR changes were identified in all of the four groups before and after administration of both urapidil and nicardipine.No significant changes could be found in the rest of the parameters.Intergroup analysis showed that SACT and CSNRT of N1 and N2 groups were shorter than those of the U2 group(P<0.01);the MAP decreased(P<0.01)and the HR increased drastically(P<0.01).Conclusions:Neither urapidil(0.25 mg/kg,0.5 mg/kg)nor nicardipine(10μg/kg,20μg/kg)has any significant influence on rabbit sinus function or rabbit atrio-ventricular node function.Nicardipine could be a better choice than urapidil for parafunctional sinus node patients.  相似文献   

16.
Objective:To investigate the gene expression of osteoprotegerin(OPG) and osteoclast differentiation factor(ODF) in the bone tissue of patients with hip fracture due to osteoporosis. Methods:OPGmRNA and ODFmRNA in the bone tissue in 50 cases of osteoporosis sufferers(over 50 years old) with hip fracture(Observer Group) and 30 cases of hip facture sufferers with no osteoporosis(Control group) were analyzed with the Semi-Quantitative RT-PCR method. Results:The mRNA expressed of ODF, OPG were both high in the patients with hip fracture. In the control group, the expression of OPG mRNA was observed, while the expression of ODF mRNA was very slight. Conclusion:Aged patients contained all signals including OPG, ODF that are essential for inducing osteoclastogenesis and promoting bone resorption.  相似文献   

17.
Objective:To probe into the influence of changes of ovarian hormones on the pathogenesis of the specific sub-type premenstrual syndrome(PMS)and reveal partial microcosmic mechanisms of adverse flow of liver-qi.Methods:Estradiol(E2)and progesterone(P)levels in serum were determined at different phases of menstrual cycle by radioimmunoassay.Results:In the group of PMS with adverse flow of liver-qi.the secretive peak value Of E2 and P at the follicular phase significantly decreased,and the secretive peak value at the luteal phase did not come into being.Conclusions:Low E2 and P secretive peak at the follicular phase and absence of secretive peak at the luteal phase is one of the microcosmic mechanisms of PMS with adverse flow of liver-qi.One of the pathophysiologic mechanisms of specific sub-type PMS is probably the continuous low level of E2and P.  相似文献   

18.
Real-time three-dimensional echocardiography (RT3DE)is a new ultrasound technique that enables dynamic threedimensional visualization and quantification of the heart in real time. Investigation of feasibility and methodology of RT3DE in determining left ventricular (LV) and right ventricular (RV) volumes, RT3DE was performed in 35 normal adults using Philips SONOS 7500 system with a 2-4 MHz matrix array transducer. The 60°×60° "pyramid" volume database was obtained and analyzed on a TomTec echo workstation. Both LV and RV volumes were calculated with four 3DE methods (i.e. apical 2, 4, 8, and 16-plane) through manually tracing ventricular endocardial borders in end diastole and end systole. Stroke volumes were then calculated. LV volume was also measured by 2DE Simpson's rule using GE VIVID 7 ultrasound machine.  相似文献   

19.
Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.  相似文献   

20.
A clinical guideline for the therapeutic interventions of integrative medicine may be defined as a written document which states a series of recommendations on therapeutic interventions of integrative medicine for a special disease or condition. The guideline may provide assistance to medical professionals in making clinical decisions aimed at improving the clinical outcome of patients and reducing the costs of medical care(~'4~. Recommendations issued by a guideline should be based on the best available evidence in both Western and Chinese medicine. For fulfilling this purpose, the development of clinical guidelines for therapeutic interventions in the field of integrative medicine should follow scientific principles and undergo a rigorous processes.  相似文献   

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