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1.
目的探讨凝血酶(TM)对海马神经元凋亡调控凶子Bcl-2、Bax及c-jun氨基末端激酶(JNK)表达的影响,阐明TM诱导凋亡的机制。方法海马神经元经40U/mLTM作用0h、6h、12h、24h、48h、72h后终止培养,应用免疫细胞化学方法检测Bcl-2及Bax蛋白表达,Western blot检测磷酸化JNK(P—JNK)及JNK蛋白表达。结果TM作用6h后,Bcl-2蛋白表达增加,12h后开始下降,到48h达到最低值(P〈0.01),72h后Bcl-2蛋白表达开始回升。TM作用6h后,Bax蛋白表达增加,随作用时间的延长,Bax蛋白表达水平逐渐上升,到48h达到最高值(P〈0.01)。Bcl-2/Bax比值逐渐降低,在48h达最低。TM作用0h时P-JNK蛋白无表达,6h后开始表达,与0h组比较差异存在显著性(P〈0.011,12h时达高峰(P〈0.01),并持续到24h,48h后逐渐降低。0h组可见有少量JNK蛋白表达,6h后JNK蛋白表达显著增加(P〈0.01),随TM作用时间的延长,JNK蛋白表达无明显变化。结论TM可能是通过抑制Bcl-2的表达,增强Bax的表达,降低Bcl-2和Bax的比值,激活JNK信号传导通路导致海马神经元凋亡。  相似文献   

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目的 探讨重症肌无力(MG)患者外周血单核细胞(PBMC)凋亡调控基因Fas、Bcl-2mRNA表达及意义。方法 应用逆转录-聚合酶链反应(RT—PCR)半定量方法检测44例MG患者(MG组)和30名健康对照者(NC组)PBMC Fas、Bcl-2mRNA的相对含量。结果 (1)MG组Fas mRNA表达水平与NC组相比差异无统计学意义;Bcl-2mRNA表达明显高于NC组(P〈0.05)。(2)中型、重型及极重型MG患者Bcl-2mRNA相对含量明显高于轻型MG患者(P〈0.05~0.01);Bcl-2mRNA相对含量与MG患者病情评分呈正相关(r=0.767,P〈0.01)。结论 MG患者PBMCFas表达可能与MG发病无关;Bcl-2mRNA高表达可能参与MG患者PBMC凋亡调控机制,其表达水平可以作为观察MG患者病情的指标.  相似文献   

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目的探讨川芎嗪对大鼠重型颅脑损伤后神经细胞凋亡及相关基因Bcl-2、Bax表达的影响和对脑神经的保护作用。方法120只SD健康大鼠随机分为假手术组、模型组、治疗组,其中模型组和治疗组采用Feeney自由落体撞击装置制作大鼠重型颅脑损伤模型,治疗组给予盐酸川芎嗪,用TUNEL及免疫组化法检测三组间细胞凋亡及Bcl-2、Bax蛋白的表达情况。结果大鼠脑组织中细胞凋亡率及Bcl-2、Bax表达水平在治疗组和模型明屁高于假手术组(P〈0.05)。在伤后72h、168h,治疗组的细胞凋亡率及Bax表达水平明显低于模型组,而Bcl-2的表达水平则明显高于模型组(P〈0.05)。结论川芎嗪可能通过抑制Bax的表达,上调Bcl-2的表达,减少神经细胞凋亡,减轻重型颅脑损伤后继发脑损害,从而发挥脑神经保护作用。  相似文献   

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目的 检测脑出血灶周组织Bax、Bcl-2的表达,探讨与神经元凋亡的关系。方法 对健康家犬30只在DSA介入下刺破大脑中动脉制作脑出血模型,选择出血后6h、12h、24h、48h、72h及96h共6个时间点,每点5只,均于相应时间点处死后取脑.检测出血灶周Bax、Bcl-2及神经元凋亡的表达。结果 Bax及神经元凋亡的表达均于48h达高峰,至96h皆明显下降(与48h比较。P〈0.01);Bcl-2出血后72h达高峰,至96h末见明显下降(与72h比较,P〉0.05);Bax的表达与神经元凋亡呈正相关(P〈0.05);Bcl-2与神经元凋亡的表达出血后48h前均呈正相关(P〈0.05),48h后均呈负相关倾向,但无统计学差异(P〉0.05)。结论 Bax及Bel-2 参与了ICH后出血灶周神经元凋亡的过程,前者诱导和加重了神经元凋亡,后者有抑制凋亡作用,但显示其强度不足。  相似文献   

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目的探讨铜离子对MES23.5多巴胺能细胞的毒性作用及可能机制。方法用MTF法检测铜离子对细胞存活率的影响;用半定量逆转录聚合酶链反应(RT-PCR),Western blotting以及高效液相色谱电化学检测法(HPLC-ECD)检测细胞内酪氨酸羟化酶(tyrosine hydroxlase,TH)mRNA、蛋白的表达以及多巴胺含量的改变:用流式细胞仪检测线粒体跨膜电位的改变。结果100μmol/L和200/2mol/L铜离子对细胞存活率没有影响,400μmol/L和800μmol/L铜离子可以造成细胞存活率降低(P〈0.01)。200μmol/L铜离子孵育细胞24h,THmRNA、蛋白表达量以及多巴胺含量较正常对照组降低(P〈0.01,P〈0.01,P〈0.05)。200μmol/L铜离子孵育细胞24h,线粒体跨膜电位较正常对照组明显降低(P〈0.01)。结论铜离子对MES23.5多巴胺能细胞具有毒性作用,降低细胞功能的表达,其机制可能与线粒体功能障碍有关。  相似文献   

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目的 研究不同时程的亚低温对大鼠大脑中动脉闭塞(MCAO)模型的神经细胞凋亡及Bcl-2、Bax的影响。方法 利用MCAO模型,缺血3小时后再灌注。缺血后即刻分别进行不同时程(0.5、1、3小时)的亚低温治疗,再灌注后24小时取脑切片作TUNEL染色及Bcl-2、Bax免疫组化染色。结果 (1)亚低温1、3小时组的凋亡细胞、Bax细胞数与对照组比较均明显降低(P<0.05,P<0.01)。(2)亚低温3小时组的Bcl-2细胞阳性率与对照组相比明显增加(P<0.05)。(3)凋亡细胞阳性率与Bcl-2/Bax比值呈负相关关系(r=-0.9759,P<0.01)。结论 缺血性脑损伤的病理过程与细胞凋亡有关,Bcl-2/Bax比值能决定细胞凋亡的发生。亚低温能增强Bcl-2并降低Bax基因的表达,有抑制细胞凋亡的作用,是保护缺血神经元的重要方法之一。  相似文献   

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目的观察艾司西酞普兰对抑郁大鼠海马BDNF表达及细胞凋亡的影响,探讨其作用机制。方法40只雄性SD大鼠随机分为对照(A)、对照+药(B)、抑郁模型(C)和抑郁模型+药(D)组共4组,采用慢性不可预见性的温和刺激结合孤养法建立抑郁大鼠模型,TUNEL法检测海马细胞凋亡情况,实时荧光定量PCR方法检测海马BDNF、Bax、Bcl2、Caspase3mRNA的表达。结果(1)C组海马细胞凋亡数显著增加,与A组比较差异有统计学意义(P〈0.01),而B组细胞凋亡数与A组差异无统计学意义(P〉0.05);D组细胞凋亡数明显减少,与c组比较差异有统计学意义(P〈0.01)。(2)C组海马BDNF、Bel—2mRNA表达降低,Bax、Caspase3mRNA表达升高,与A组比较差异均有统计学意义(P〈0.01);D组BDNF、Bcl2mRNA表达增加,Bax、Caspase3mRNA表达降低,与C组比较差异均有统计学意义(P〈0.01)。结论艾司西酞普兰可改善抑郁大鼠的抑郁行为及海马细胞凋亡,其机制可能是通过增加海马BDNFmRNA的表达,上调Bcl一2及下调Bax、Caspase3mRNA的表达,从而预防海马细胞凋亡而发挥脑保护的作用。  相似文献   

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目的 探讨亲环素A(CyPA)对Aβ25-35诱导的PC12细胞凋亡影响及可能的作用机制.方法 将PC12细胞分为正常对照组(0 μmol/L Aβ25-35)、Aβ25-35诱导组(10 μmol/L Aβ25-35)和药物保护组(0.1、1、10、100 nmol/L CyPA+10 μmoi/Lβ25-35),药物保护组采用相应浓度CyPA预处理PC12细胞30 min,再加入Aβ25-35继续培养.MTT法分析细胞存活率,Hoechst33258染色法检测细胞凋亡,RT-PCR检测Bcl-2和Bax mRNA表达,Western blotting检测Bcl-2和Bax蛋白表达.结果 1、10和100 nmol/L CyPA可提高细胞的存活率,减少Aβ25-35引起的细胞凋亡,增加Bcl-2mRNA表达以及Bcl-2蛋白表达,降低Bax mRNA表达以及Bax蛋白表达,与Aβ25-35诱导组比较差异有统计学意义(P<0.05),且CyPA剂量越高效果越明显.结论 CyPA可剂量依赖性对抗Aβ25-35对PC12细胞的毒性作用,减少细胞凋亡,其机制与上调抗凋亡基因Bcl-2表达和下调凋亡基因Bax表达有关.
Abstract:
Objective To explore the effect of cyclophilin A (CyPA) on apoptosis of PC 12 cells induced by Aβ25-35 and its potential mechanism. Methods PC 12 cells were divided into normal control group (0 μmol/L Aβ25-35), Aβ25-35 inducement group (10 μmol/L Aβ25-35) and drug protection groups (0.1, 1,10 and 100 nmol/L CyPA+10 μmol/L Aβ25-35). Cells in the drug protection groups were pretreated by CyPA of different concentrations for 30 min, and then co-cultured with Aβ25-35 We evaluated the survival rate of PC12 cells with MTT assay, analyzed the apoptosis of PC12 cells with Hoechst33258 staining, and detected the mRNA expressions of Bcl-2 and Bax with PT-PCR and the protein levels of Bcl-2 and Bax with Western blotting. Results Cells pretreated wth CyPA of 1, 10 and 100 nmol/L enjoyed an obvious elevation of survival rate of PC 12 cells, a significant reduction of apoptosis induced by Aβ25-35,an obvious increase of mRNA expression of Bcl-2 and protein level of Bcl-2, and a statistical decrease of mRNA expression of Bax and protein level of Bax as compared with those cells of the Aβ25-35 inducement group (P<0.05);and these effects were dose-dependent. Conclusion CyPA could resist the toxic role of Aβ25-35 on PC 12 cells and reduce the apoptosis in a dose-dependent manner by up-regulation of anti-apoptosis gene Bcl-2 and down-regulation of apoptosis gene Bax.  相似文献   

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目的探讨增塑剂邻苯二甲酸二丁酯对类神经细胞PC12细胞增殖能力的影响及其对PC12细胞凋亡相关基因表达的调控.为接触人群可能产生远期效应的生物学检测提供参考评价指标。方法体外培养类神经细胞株PC12细胞,培养基分别含有0,12.5,25,50mg/L邻苯二甲酸二丁酯,作用24,48,72和96h后,用细胞计数CCK-8法检测细胞的存活和增殖,台盼蓝染色绘制生长曲线,DNA凝胶电泳观察DNA—Ladder,RT—PCR检测p53,bcl-2,Bax等凋亡相关基因表达变化情况。结果邻苯二甲酸二丁酯在12.5mg/L时即表现出显著的抑制PC12细胞增殖的作用(P〈0.01),且随剂量增加抑制作用增强,同时出现DNA断裂阳性;凋亡相关基因均有表达,其中p53基因、Bax基因表达增加,bcl—2基因表达降低,且呈剂量相关关系(P〈0.01)。结论邻苯二甲酸二丁酯暴露可抑制PC12细胞增殖并诱导PC12细胞凋亡,同时通过调节凋亡相关基因p53、Bax、bcl-2基因的表达水平而在其凋亡发生中起重要作用。推测邻苯二甲酸二丁酯长期低剂量暴露的累积效应与阿尔茨海默病以及其他神经细胞凋亡相关性疾病的发生发展可能存在相关关系。  相似文献   

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目的观察蛇床子素(osthole)对1-甲基-4-苯基吡啶离子(MPP+)诱导PC12细胞损伤的神经保护作用。方法将MPP+加入培养的PC12细胞中,建立多巴胺能神经元损伤模型,加入不同浓度的蛇床子素预处理细胞(0.01、0.05、0.1mmol/L)。处理24h后用噻唑蓝(MTT)比色法检测细胞活性;以乳酸脱氢酶(LDH)活性测定反映细胞的损伤程度;采用Westernblot法检测Bax、Bcl-2蛋白的表达,分析Bax/Bcl-2比值变化,以及检测细胞色素C的改变。结果蛇床子素可以明显减少MPP+诱导的PC12细胞活性的降低,LDH的释放,Bax/Bcl-2比值的增高以及细胞色素C的释放(P〈0.05)。结论蛇床子素对MPP+诱导的PC12细胞损伤具有保护作用。  相似文献   

11.
This is the summary of a meeting where a group of experts, representing several health organizations and academic departments from different parts of Brazil, created a consensus about the main alcohol policies which should be implemented by different levels of the Brazilian government. The World Health Organization has been suggesting for 30 years the actions that should be implemented for the public good. Two important conclusions were reached: 1) The research establishes beyond doubt that public health measures of proven effectiveness are available to serve the public good by reducing the widespread costs and pain related to alcohol use; 2) To that end, it is appropriate to deploy responses that influence both the total amount of alcohol consumed by a population and the high-risk contexts and drinking behaviours that are so often associated with alcohol-related problems. To conceive of these intrinsically complementary approaches as contractory alternatives would be a mistake. The objectives of the consensus are: 1) To make the scientific evidences more available to the Brazilian policy makers; 2) To facilitate the evaluation of the available strategies according their effectivity, scientific support, cost and cultural adaptability; 3) To make the Brazilian health professionals familiar with the priorities of alcohol policies.  相似文献   

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应重视脑卒中的综合预防   总被引:58,自引:1,他引:57  
脑卒中高居人口死亡原因的第 2位 ,每年新发患者 >15 0万例 ,现有幸存者 >6 0 0万例 ,其中 75 %丧失劳动力 ,4 0 %中度致残 ,是老年人致残和认知障碍的主要原因 ,年直接或间接经济损失高达数百亿元。高血压、心脏病、房颤、糖尿病、高脂血症、无症状颈动脉狭窄以及不良生活方式 ,包括吸烟、酗酒等均为脑卒中的危险因素 ,应针对危险因素予以控制 ,并长期有效坚持 ,大部分脑卒中是可以预防的。1.高血压 :我国高血压超过 1亿人口 ,是脑卒中最常见的可控危险因素。 14项随机对照研究结果表明 ,舒张压降低 5~ 6mmHg可以减少脑卒中发生率的 4…  相似文献   

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Summary Sixty nine patients with Parkinson's disease were treated with L-DOPA for more than a year. L-DOPA produced remarkable improvement in akinetic patients, moderate improvement in rigidity and slight improvement in tremor. The degree of improvement in akinesia, rigidity and tremor tended to be reversely related to the severity of the disease. Rigidity and akinesia improved better in young patients, but there was no correlation between age and the response of tremor to the treatment. Except for rigidity there was no correlation between the improvement and the duration of the disease.
Zusammenfassung 69 Parkinsonpatienten wurden während mehr als 1 Jahr mit L-DOPA behandelt. Es wurde dadurch bei akinetischen Patienten eine beachtliche, bei Patienten mit Rigor eine mäßige und bei Patienten mit Tremor eine geringfügige Besserung erreicht. Das Ausmaß der Besserung war in allen drei Formen um so geringer, je ausgeprägter die Symptome bei Behandlungsbeginn waren. Rigor und Akinesie sprachen bei jungen Patienten besser auf die Therapie an, aber es bestand keine Korrelation zwischen dem Alter der Patienten und der Beeinflußbarkeit des Tremors durch die L-DOPA-Therapie. Außer für den Rigor bestand keine Korrelation zwischen dem Ausmaß der Besserung und der Dauer der Erkrankung vor Behandlungsbeginn.
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In a series of tests,the action of ethamsylate on haemostasis and on platelet functions was examined. After oral administration of the drug,a highly significant diminution of the bleeding time and of the blood loss from a standard wound was observed. This effect was demonstrated in healthy individuals and in patients suffering from platelet dysfunctions,and there was a distinct dose relation. There was also an increase of platelet adhesion,of PF 3 availability and of PF 4 release. The action of prostacyclin on the epinephrine induced platelet aggregation could be inhibited by ethamsylate. This offers a possible explanation for some of the effects on hemostasis. In addition,an action of ethamsylate on the platelet membrane was assumed since an in vitro increase of functions of the platelet membrane like PF 3 availability would not be explainable by a possible inhibition of prostacyclin.  相似文献   

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Post-stroke depression (PSD) has a negative impact on rehabilitation following stroke. No satisfactory antidepressant treatment for PSD has yet been developed. The present study examined the effect of milnacipran, a serotonin and norepinephrine reuptake inhibitor, on PSD patients. Eleven PSD patients taking milnacipran in a rehabilitation hospital were compared to age-matched, sex-matched, and severity of depression at admission-matched PSD patients hospitalized during 2001 who did not take any antidepressant as historical control. Severity of depression was measured using self-rating depression scale for depression (SDS) assessed at admission and discharge after 3 months inpatient rehabilitation. Activities of daily living (ADL) and quality of life (QOL) were measured, respectively, by the functional independence measure (FIM) and a self-completed questionnaire for QOL (QUIK) as outcomes of rehabilitation. For the SDS score, the group taking milnacipran showed significant improvement compared to the control group in our study. FIM was improved in both groups. In the end QUIK did not change significantly in either group. We found no major side-effects of milnacipran among the patients. These results suggest that milnacipran is a safe and effective treatment for PSD for inpatients undergoing rehabilitation.  相似文献   

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目的探讨持续颅内压监测在小脑出血手术中的临床意义。方法回顾性分析16例小脑出血手术患者的临床资料,均采用脑室内颅内压监测,根据ICP值调节脱水剂的用量。结果全组死亡5例,其中3例为有严重合并症的老年患者,1例为脑干功能衰竭,1例为再出血,家属放弃治疗。颅内压监测5~14d,平均7.8d,无探头植入引起的颅内大出血,2例发生颅内感染,对症治疗后好转。经过3个月~1年的随访,平均8个月,根据GOS评分:良好7例,中残3例,重残1例。结论小脑出血患者手术后应用持续颅内压监测,可指导降颅压药物的实施,能及早、安全拔除脑室引流,对减少颅内感染的发生有着积极的临床意义,操作简单,值得推广。  相似文献   

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