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1.
目的 探讨缺血后处理对糖尿病大鼠缺血再灌注心肌的保护作用.方法 通过尾静脉注射2%链脲佐菌素溶液(45mg/kg)建立糖尿病大鼠模型,并将大鼠随机分为4组(每组12只):正常组:正常大鼠自由饲食水,不做任何手术处理;假手术组:糖尿病大鼠开胸后在冠状动脉左前降支(LAD)下穿线,不结扎;缺血再灌注(IR)组:结扎糖尿病大鼠LAD造成缺血30min,再灌注2h;缺血后处理(IPostC)组:结扎糖尿病大鼠LAD 30 min,再灌注30 s,阻断30 s,重复3次,再灌注2h.采用TTC法检测心肌梗死面积,TUNEL法检测心肌细胞凋亡.结果 与IR组比较,IPostC组大鼠心肌梗死面积及凋亡指数明显减小,差异有统计学意义(P<0.05).结论 缺血后处理能够减小心肌梗死面积,减少心肌细胞凋亡,对糖尿病大鼠缺血再灌注心肌具有保护作用.  相似文献   

2.
目的:研究缺血后处理对缺血再灌注心肌细胞凋亡及Bcl-2和Bax蛋白表达的影响.方法:24只大耳白兔随机分成4组:假手术组(S)、缺血再灌注组(IR)、缺血预适应组(IP)和缺血后处理组(IPO).S组(6只):开胸只穿线不结扎血管,麻醉维持120 min;IR组(6只):结扎30 min,再灌注120 min;IP组(6只):结扎5 min,再灌注5 min,反复3次诱导缺血预适应,之后再按IR组操作;IPO组(6只):结扎30 min后, 再灌注10 s、缺血10 s, 反复6次,再灌注120 min.应用TUNEL法观察各组心肌细胞凋亡,应用免疫组化SP法观察Bcl-2和Bax蛋白的表达.结果:与IR组相比,IP组和IPO组心肌梗死范围减小,心肌细胞的凋亡指数降低(P<0.05),Bcl-2/Bax比例升高(P<0.05),而IP组和IPO组间差异无统计学意义(P>0.05).结论:缺血后处理可以减轻再灌注心肌细胞的凋亡,这一过程可能是通过升高Bcl-2/Bax比值来实现的.  相似文献   

3.
阿魏酸钠对兔急性心肌梗死再灌注后无复流的影响   总被引:2,自引:0,他引:2  
目的 探讨阿魏酸钠对兔急性心肌梗死(acute myocardial infarction,AMI )再灌注后无复流的作用及机制.方法 随机将24只成熟雄性新西兰大白兔分为假手术组、对照组、阿魏酸钠组3组,每组8只,分别建立AMI缺血再灌注模型,于缺血前5min、结扎后240 min,再灌注后120 min取静脉血.采用酶联免疫吸附法(ELISA)测定血清白介素-6(IL-6);免疫组织化学法观察心肌组织P-选择素(Ps)的变化;应用硫黄素染色评估无复流面积.结果 ①对照组和阿魏酸钠组AMI后240 min、再灌注后120 min的血清IL-6均显著高于假手术组(P均<0.01);阿魏酸钠组各时间点除AMI前血清IL-6均显著低于对照组(P均<0.05).②Ps免疫组化显示,对照组及阿魏酸钠组中,Ps在复流区及无复流区血管内皮细胞有强表达,明显强于正常区及假手术组(P均<0.01);阿魏酸钠组与对照组比较,Ps在复流区及无复流区表达均明显减弱(P均<0.01).③病理染色分析示,阿魏酸钠组结扎区心肌范围与对照组相比差异无统计学意义(P均>0.05);无复流区心肌范围与对照组相比显著降低(P均<0.01 ).结论 阿魏酸钠能有效抑制炎症反应,防治AMI再灌注后无复流.  相似文献   

4.
目的:研究肿瘤坏死因子-α(tumor necrosis factor-alpha,TNF-α)、细胞间黏附分子-1(intracellular adhesion molecules-1,ICAM-1)在家兔心肌无复流模型血浆中的表达水平及调节机制。方法:30只新西兰大白兔,随机分为假手术组、心肌缺血再灌注组和四氢吡咯二硫代氨基甲酯(pyrrolidine dithiocarbamate,PDTC)组(缺血前30 min经耳缘静脉注射PDTC 20 mg/kg)。心肌缺血再灌注组和PDTC组采用开胸冠状动脉结扎回旋支90 min再松解60 min的方法建立家兔心肌无复流模型。通过酶联免疫吸附试验测定各组家兔缺血再灌注过程中炎症因子TNF-α和ICAM-1在血浆的表达水平、测定心肌不同区域心肌髓过氧化酶(myeloperoxidase,MPO)活性、光镜及电镜下观察心肌细胞受损情况。结果:家兔心肌缺血再灌注组炎症因子TNF-α和I-CAM-1的表达水平在缺血后150 min时达高峰,明显高于PDTC组(P<0.05)。心肌缺血再灌注组无复流区及缺血区心肌MPO活性较假手术组和PDTC组均明显升高(P<0.05)。PDTC组无复流区心肌细胞损伤程度轻于缺血再灌注组。 结论:家兔心肌缺血再灌注诱导炎症因子的表达;抑制核因子-κB激活可减少无复流区的中性粒细胞浸润和激活,减少炎症因子的表达,减轻无复流区心肌再灌注损伤程度。  相似文献   

5.
目的 研究替罗非班对大鼠急性心肌梗死再灌注后无复流的影响,探讨其改善无复流的可能机制.方法 SD大鼠40只随机分为假手术组(Sham组)、急性心肌梗死再灌注组(AMI/R组)和替罗非班组(Tiro组).采用垫扎球囊法结扎冠状动脉左前降支60 min,再灌注120 min,复制急性心肌梗死再灌注无复流模型.硫黄素S、伊文斯蓝、TTC染色分别评估大鼠心肌无复流、缺血及梗死范围;紫外分光光度计测定心肌一氧化氮合酶(NOS)活性;Wstern blotting测定缺血区心肌内皮型NOS(eNOS)、丝氨酸1177磷酸化eNOS (p-eNOS ser1177)及血管内皮钙黏蛋白(VE-cadherin)的表达.结果 与Sham组比较,AMI/R组大鼠心肌eNOS活性降低,iNOS活性增高(P<0.01),p-eNOS ser1177表达增加,VE-cadherin表达减少(P<0.05);与AMI/R组比较,Tiro组大鼠心肌eNOS活性增高,iNOS活性降低,p-eNOS ser1177、VE-cadherin表达增加(均P<0.05),无复流及梗死范围明显缩小(P<0.01).结论 替罗非班可缩小无复流及梗死范围,其机制可能与保护微血管内皮结构和功能完整性有关.  相似文献   

6.
目的:观察恒定磁场干预对大鼠心肌缺血/再灌注损伤和无复流面积的影响.方法:将24只雄性sD大鼠随机分为4组:假手术组、缺血/再灌注组、50mT恒定磁场+缺血/再灌注组及100mT恒定磁场+缺血/再灌注组,每组6只.大鼠麻醉开胸,结扎冠状动脉前降支40min,再灌注4h.采用硫黄素染色评估缺血心肌再灌注后的无复流面积,Evan’s蓝和氯化三苯基氮四唑(TTC)染色法测定心肌梗死范围;全自动生化分析仪测定血清肌酸激酶(CK)的水平,微粒子化学发光法测定血清肌钙蛋白I(cTnI)的水平.结果:50mT及100mT恒定磁场干预组的心肌梗死面积和无复流面积显著小于缺血/再灌注组(P〈0.05).缺血/再灌注组大鼠血清CK和cTnI的水平与假手术组比较显著升高(P〈0.05);而不同强度的恒定磁场干预+缺血/再灌注组血清CK和cTnI的水平与缺血/再灌注组比较显著降低(P〈0.05).结论:恒定磁场干预可减轻缺血/再灌注所致大鼠心肌的损伤和无复流面积.  相似文献   

7.
目的 探讨脑利钠肽(BNP)后处理对在体大鼠心肌缺血再灌注损伤心肌的保护作用.方法 24只雄性Sprague-Dawley大鼠,随机分为:(1)假手术组(SHAM组):只开胸,不结扎冠状动脉;(2)缺血再灌注组(I/R组):结扎冠状动脉左前降支45 min,再灌注 3 h;(3)脑利钠肽组(BNP组):结扎冠状动脉左前降支45 min,再灌注 3 h,在再灌注前10 min,开始静脉予BNP 0.01 μg/(kg ·min),BNP静脉恒速维持至再灌注结束.用2,3,5,氯化三苯基四氮唑检测缺血再灌注心肌的梗死面积,用TUNEL方法检测缺血再灌注心肌的凋亡,检测心肌组织超氧化物歧化酶(SOD)、丙二醛(MDA)的浓度以评估缺血再灌注心肌活性氧的水平.结果 SHAM组心肌无梗死,I/R组的大鼠梗死面积为(44.02±10.15)%,BNP组的梗死面积为(21.53±9.08)%(P<0.05).SHAM组、BNP组与I/R组的心肌细胞凋亡指数分别为(3.13±1.62)%、(19.45±9.62)%和(38.46±12.31)% (P<0.05).与I/R组相比,BNP组的缺血再灌注心肌组织中MDA减少(P<0.05),而SOD增多(P<0.05).结论 BNP后处理能减少在体大鼠缺血再灌注的心肌损伤,其机制与其减少心肌缺血再灌注损伤导致的心肌细胞凋亡及降低心肌缺血再灌注损伤时的活性氧水平相关.  相似文献   

8.
目的探讨内质网应激(ERS)在大鼠缺血再灌注损伤心肌中的表达以及小剂量衣霉素(TM)预处理对缺血再灌注损伤心肌的影响。方法 SD大鼠30只随机分为三组,假手术组(Sham组)、缺血再灌注组(IR组)、衣霉素处理+IR组(TM+IR组),每组10只。Sham组单纯开胸,不结扎冠状动脉;IR组开胸,结扎前降支30 min,再灌注2 h;TM+IR组TM腹腔注射0.6 mg/kg,30 min后结扎前降支30 min,再灌注2 h。于开胸后,心肌再灌注2 h抽血,检测肌钙蛋白I(c Tn I)含量,透射电镜观察再灌注2 h心肌的超微结构,检测再灌注2 h心肌的GRP78 mRNA及蛋白表达。结果 IR组和TM+IR组在再灌注2 h时,c Tn I水平均明显上升;IR组心肌超微结构损伤最严重,TM+IR组次之。再灌注2 h后,GRP78 mRNA及蛋白,IR组及TM+IR组明显升高。结论 MIRI可诱导ERS,小剂量TM预处理可减轻MIRI。  相似文献   

9.
目的 探讨吗啡预处理(MP)对大鼠全心缺血再灌注损伤(IRI)后心肌组织中Caspase-3表达水平以及心肌细胞凋亡的影响.方法 雄性成年SD大鼠51只随机分为3组:对照组(Sham组)、全心缺血再灌注组(IR组)、MP组(1μmol/L).Sham组持续灌注195 min.IR组灌注K-H液45 min后制备离体全心缺血30 min再灌注10、60、120 min模型.MP组于缺血前灌注含吗啡K-H液和无吗啡K-H液各5 min,3个循环.氯化三苯基四氮唑(TTC)染色测定梗死区(IS)、缺血危险区(AAR)以及IS/AAR比值;化学比色法测定冠脉流出液乳酸脱氢酶(LDH)活性;Western blot及TUNEL染色分别测定心肌组织Caspase-3蛋白表达及细胞凋亡情况.结果 与Sham组比较,IR组再灌注末心肌梗死体积百分比增加,再灌注后各时间点LDH活性、Caspase-3蛋白表达及心肌细胞凋亡比率均显著升高(P<0.05);与IR组比较,MP显著降低IS/AAR比值和再灌注后各时点LDH活性、Caspase-3蛋白表达以及心肌细胞凋亡比率(P<0.05);IR组与MP组均以再灌注10 min时LDH水平、再灌注60 min时Caspase-3蛋白表达和再灌注120 min时细胞凋亡比例最高.结论 MP的心肌保护作用与降低再灌注前期Caspase-3蛋白表达及减轻再灌注后心肌细胞凋亡有关.  相似文献   

10.
花旗松素对大鼠心肌缺血再灌注损伤的保护作用   总被引:2,自引:0,他引:2  
目的 探讨花旗松素在大鼠心脏急性缺血再灌注损伤中的保护作用.方法 48只大鼠随机分为4组:假手术组(S组)、模型对照组(C组)、花旗松素低剂量组(L组)及花旗松素高剂量组(H组).建立在体急性心脏缺血再灌注损伤模型,S组不结扎冠脉,余三组结扎大鼠左前降冠状动脉30min后再灌注2h.术后测定各组局部受损心肌中丙二醛(MDA)的含量和超氧化物歧化酶(SOD)、髓过氧化物酶(MPO)的活性;测定各组心肌梗死面积、心肌细胞凋亡情况;观察心肌病理学变化.结果 与S组相比,再灌注2h后C组左室内压峰值和±dp/dtmax明显下降,MDA含量及MPO活力明显升高,SOD活力明显下降;L组与H组血流动力学显著改善,与C组比较,MDA含量及MPO活力下降明显,SOD活力显著升高,且两组心肌梗死面积和心肌细胞凋亡指数亦降低.结论 花旗松素对大鼠心脏急性缺血再灌注心肌损伤有明显的保护作用.  相似文献   

11.
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   

12.
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   

13.
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   

14.
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   

15.
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   

16.
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   

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.
Journal of Nanjing Medical University (English Edition) JNMU, sponsored by Nanjing Medical University, was established in 1987. It is a bimonthly comprehensive English medical journal published locally and abroad.Since 2007, Journal of Nanjing Medical University (English Edition )was granted Elsevier the full publishing and distribution rights worldwide for the Electronic Edition, excluding the People's Republic of China.  相似文献   

19.
Objective To measure Derpl and Blot5 allergen levels in asthmatics' homes in Hongkong.Methods Seventy houses were enrolled for a mite indoor environment study. Dust samples were obtained from two sites of each patients' house: bed and floor. Derpl and Blot5 levels were quantified by a two-site monoclonal antibody-based ELISA technique.Results The levels of Derpl allergens found in bed (geometric mean (GM) 3.43 μg/g of dust; 95%CI, 1.89-4.96 μg/g)and on the floor (GM 1.12 μg/g of dust; 95%CI, 0.71-1.53 μg/g) indicated significant differences (P=0.005). However, the levels of Blot5 allergens found in bed (GM 19.00 μg/g of dust; 95%CI, 0.89-38.90 μg/g) and on the floor (GM 6.14 μg/g of dust; 95%CI, 0.40-11.90 μg/g) showed no statistically significant difference. In addition, in regards to the exposure index for Derpl and Blot5 allergens found in bed and on the floor, 17.6% in bed and 8.6% on the floor had levels of Blot5 ≥ 10 μg/g of dust, higher than those obtained for Derp1 (7.2% and 0% in bed and on the floor respectively, P< 0.05); higher percentages in bed and on the floor (25.0% and 35.7%) were observed for levels of Blot5 =0 μg/g of dust as compared with Derpl in bed and on the floor (4.3% and 14.5% respectively, P< 0.05).Conclusions Derpl and Blot5 are the major allergens found in this regional study, Blot5 is a more potent allergen in Hongkong, probably reflecting the high level of exposure to Blomia tropicalis (Bt). Bt and Dermatophagoides pteronyssinus (Dp) allergens should be included for precise diagnosis and effective immuno-therapeutic treatment of mite allergy in Hongkong.  相似文献   

20.
ANTI-PROLIFERATION EFFECT OF ORIDONIN ON HL-60 CELLS AND ITS MECHANISM   总被引:4,自引:0,他引:4  
Objcetive To investigate the anti-proliferation effect of oridonin on leukemic HL-60 cells and its mechanism. Methods HL-60 cells in vitro in culture medium were given different concentrations of oridonin. The inhibitory rate of cells were measured by microculture tetrazolium (MTT) assay, cell apoptotic rate was detected by flow cytometry (FCM), morphology of cell apoptosis was observed by hoechst 33258 fluorescence staining, and the activity of telomerase was detected using telomere repeat amplification protocol (TRAP) PCR-ELISA before and after apoptosis occurred. Results Oridonin could decrease telomerase activity, inhibit growth of HL-60 cells, and cause apoptosis significantly. The suppression was both in time- and dose-dependent manner. Marked morphological changes of cell apoptosis including condensation of chromatin and nuclear fragmentation were observed clearly by hoechst 33258 fluorescence staining especially after cells were treated 48-60 hours by oridonin. Conclusions Oridonin has apparent anti-proliferation and apoptotic effects on HL-60 cells in vitro, decreasing telomerase activity of HL-60 cells may be one of its most important mechanisms. These results will provide strong laboratory evidence of oridonin for clinical treatment of acute leukemia.  相似文献   

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