当归红芪超滤膜提取物对过氧化氢致PC12细胞氧化损伤的影响

目的观察当归红芪超滤膜提取物对过氧化氢(H2O2)致PC12细胞氧化损伤的影响。方法 H2O2诱导PC12细胞构建氧化应激损伤模型;不同剂量当归红芪超滤膜提取物(0.38、0.75、1.5 g/L)干预;MTT法测定细胞存活率;生化法检测细胞内MDA、LDH、SOD含量;双氯荧光黄乙酸乙酯(DCF-DA)染色,检测细胞内ROS含量。结果 200μmol/L H2O2作用6 h成功诱导PC12细胞氧化应激损伤;与空白对照组比较,H2O2模型组细胞存活率下降,细胞内LDH、MDA、ROS含量增多,SOD含量下降(P0.05);与H2O2模型组相比,当归红芪超滤膜提取物各剂量组细胞存活率明显上升,细胞内LDH、MDA、ROS含量降低,SOD含量增加(P0.05)。结论当归红芪超滤膜提取物可修复H2O2诱导的PC12细胞氧化损伤。     

桔梗多糖对H2O2诱导PC12细胞氧化损伤的保护作用及机制研究

目的 研究桔梗多糖（PGP）对H2O2致PC12细胞氧化应激损伤的保护作用机制。方法 建立H2O2诱导PC12细胞氧化损伤模型,MTT法检测细胞存活率;比色法测定细胞内乳酸脱氢酶（LDH）、丙二醛（MDA）含量、超氧化物歧化酶（SOD）以及谷胱甘肽过氧化物酶（GSH-Px）的活性;DCFH-DA检测细胞内ROS;qPCR、Western Blot方法分别检测NOX2、p22和Rac mRNA和蛋白的表达。结果 与模型组相比,PGP预处理24h后,加入终浓度为600 μmol/L H2O2处理2h,LDH、MDA含量和细胞内ROS减少,SOD与GSH-Px活性增强,同时,PGP下调NOX2、p22和Rac mRNA和蛋白的表达水平。结论 PGP对H2O2诱导的PC12细胞的氧化损伤具有保护作用,其作用机制可能与抑制NADPH氧化酶2(NOX2)过表达有关。      

淫羊藿苷预适应对乳鼠心肌细胞的保护作用

目的:探讨淫羊藿苷预适应对培养乳鼠心肌细胞缺氧/复氧损伤和氧化损伤的作用及其机制。方法:体外培养原代乳鼠心肌细胞,淫羊藿苷预适应24h后,采用连二亚硫酸钠(Na2S2O4)诱导心肌细胞缺氧/复氧损伤和过氧化氢(H2O2)诱导氧化损伤模型,测定细胞存活率(MTT法)、细胞培养液中乳酸脱氢酶(LDH)释放量、细胞内超氧化物歧化酶(SOD)活性和丙二醛(MDA)含量。结果:在缺氧/复氧损伤模型和氧化损伤模型中,淫羊藿苷预适应明显提高细胞存活率,增加胞内SOD活性,降低培养液中LDH释放量和胞内MDA含量。结论:淫羊藿苷预适应对缺氧/复氧损伤以及氧化损伤心肌细胞都具有明显的保护作用,可能与其抑制脂质过氧化作用有关。     

7-二氟甲基金雀异黄素对H_2O_2诱导PC12细胞损伤的保护作用

目的:探讨7-二氟甲基金雀异黄素对PC12细胞氧化应激损伤的保护作用。方法:采用过氧化氢(H2O2)诱导PC12细胞氧化应激损伤的模型,MTT法检测细胞增殖活性,碘化丙啶(PI)染色流式细胞术(FCM)检测细胞凋亡,多功能生化分析仪测定培养液上清中的乳酸脱氢酶(LDH)活性。结果:7-二氟甲基金雀异黄素能有效拮抗40.0μmol/L的H2O2孵育24h对PC12细胞增殖活性的抑制作用和对PC12细胞凋亡的诱导作用,并能减少40.0μmol/L的H2O2诱导的PC12细胞的LDH释放。结论:7-二氟甲基金雀异黄素对过氧化氢诱导PC12细胞的氧化应激损伤具有保护作用。     

氯化锰致PC12细胞损伤的研究

探讨氯化锰（MnCl2）对PC12细胞的损伤作用。方法：构建MnCl2诱导的PC12细胞模型，用MTT法检测细胞存活率，用荧光分光光度法检测乳酸脱氢酶（LDH）和活性氧（ROS）生成量，用化学比色法测定细胞内丙二醛（MDA）含量和超氧化物歧化酶（SOD）活性。结果：MnCl2诱导的PC12细胞存活率明显下降，并与诱导时间和浓度呈正相关；MnCl2使PC12细胞LDH外溢量和ROS生成量显著增加，同时细胞内MDA含量增加，SOD活性下降。结论：MnCl2可导致PC12细胞的氧化损伤。     

葛根素对大鼠心肌细胞缺氧/复氧损伤的保护作用

目的:研究葛根素对培养SD乳鼠心肌细胞缺氧/复氧(A/R)损伤的拮抗作用。方法:葛根素(50和100mg/L)预处理24h后作用于乳鼠心肌细胞A/R损伤模型,运用MTT法测定细胞存活率,比色法测定细胞培养液中LDH和细胞内SOD活性及MDA含量。运用流式细胞术Annexin V-PI双染法测定细胞凋亡变化。结果:与A/R模型组比较,葛根素明显提高细胞存活率,增加胞内SOD活性,降低培养液中LDH释放量和胞内MDA含量;同时降低细胞的凋亡率。结论:葛根素对A/R损伤心肌细胞具有保护作用,其机制可能与清除自由基的产生有关。     

槲皮素对H2O2所致乳鼠培养心肌细胞损伤的保护作用

目的 观察槲皮素(QUE)对H2O2所致乳鼠培养心肌细胞损伤的保护作用.方法 原代培养的新生Wistar乳鼠,随机分为正常对照组、H2O2损伤组和3种剂量QUE保护组.用比色法观察乳鼠心肌细胞培养液的乳酸脱氢酶(LDH)、脂质过氧化产物-丙二醛(MDA)的含量及超氧化物歧化酶(SOD)活性,并用电镜观察心肌细胞形态学改变.结果 H2O2损伤组乳鼠心肌细胞培养液中LDH和MDA含量显著增高,SOD活性降低(与对照组相比,P＜0.01),心脏超微结构损伤严重;QUE保护组与H2O2损伤组相比,LDH和MDA明显降低,SOD活性升高,心肌形态学变化减轻.结论 槲皮素对H2O2诱导的乳鼠心肌细胞损伤有保护作用,其机制可能与清除氧自由基、抗脂质过氧化损伤有关.     

不同强度热休克预处理对氧化应激所致乳鼠心肌细胞损伤的影响

目的:探讨不同强度热休克预处理对氧化应激所致体外培养的乳鼠心肌细胞损伤的影响.方法:用热休克预处理原代培养的乳鼠心肌细胞,向心肌细胞中加入终浓度为0.5 mmol/L的过氧化氢(H20:),以模拟氧化应激造成心肌细胞损伤.将心肌细胞分为5组:对照组(Ctrl组)、H2O2损伤组(H2O2组)、低强度热休克预处理(42℃,15 min,恢复12 h) H2O2组(HSR15 min H2O2组)、中等强度热休克预处理(HSR45 min) H2O2组和高强度热休克预处(HSR90 min) H2O2组.四甲基偶氮唑盐(MTT)法观察处理后各组细胞的活力;流式细胞仪测定细胞凋亡率;检测各组培养液中乳酸脱氢酶(LDH)含量.细胞中超氧化物歧化酶(SOD)活性和丙二醛(MDA)含量.结果:与Ctrl组比较,H2O2组的细胞活力和SOD活性都明显降低(P<0.01),而细胞凋亡率、LDH和MDA含量明显增高(P<0.01);与H2O2组比较,HSR15 min H2O2组和HSR45min H2O2组的细胞活力和SOD活性明显增高(P<0.01),而细胞凋亡率、LDH和MDA含量明显降低(P<0.01),HSR90 min H2O2组与H2O2组无明显差异(P>0.05);与HSR45 min H2O2组比较,HSR15 min H2O2组和HSR90 min H2O2组的细胞活力和SOD活性明显降低(P<0.01).而细胞凋亡率和MDA含量明显增高(P<0.01),LDH也明显增高(P<0.05或P<0.01).结论:热休克预处理能减轻过氧化氢所致体外培养的新生大鼠心肌细胞损伤,且不同强度热休克预处理对心肌细胞的保护作用不同.     

西红花酸对心肌细胞氧化应激性损伤的作用

目的：探讨西红花酸对心肌细胞氧化应激性损伤的效应。方法：采用过氧化氢(H2O2)诱导法制备大鼠培养心肌细胞氧化应激损伤模型，通过观察培养心肌细胞的形态，检测细胞培养液中乳酸脱氢酶(LDH)活性、细胞内丙二醛(MDA)含量和超氧化物歧化酶(SOD)活性及培养细胞台盼蓝摄取率，反映西红花酸对该模型的影响。结果：在本实验使用浓度范围内，H2O2损伤培养心肌细胞的作用呈浓度依赖性地增大；西红花酸则能减少该氧化应激细胞的形态学改变、降低培养液中LDH活性和胞内MDA含量、增加胞内SOD活性及减少细胞死亡数量。结论：西红花酸对H2O2，造成的培养心肌细胞氧化应激性损伤具有明显的保护作用。     

银杏内酯B对H_2O_2诱导PC12细胞氧化损伤的影响

目的 :探讨银杏内酯B(ginkgolideB)对过氧化氢 (Hydrogenperoxide ,H2 O2 )引起PC12细胞氧化损伤的保护作用。方法 :用噻唑兰 (MTT)检测PC12细胞的存活率 ;乳酸脱氢酶法检测PC12细胞损伤 ;用硫代巴比妥酸法测定细胞脂质过氧化物 ;同时检测细胞内抗氧化酶的活性。结果 :PC12细胞在 5 0～ 30 0 μmol LH2 O2 作用 3h后 ,细胞的死亡率及乳酸脱氢酶 (LDH)释放明显增加 ,抗氧化酶如超氧化物歧化酶 (superoxidedismutase ,SOD)、谷胱甘肽过氧化酶 (glutathioneperoxidase ,GSH Px)活性显著降低 ,而脂质过氧化物生成增多。银杏内酯B 10～ 10 0 μmol L能显著降低细胞死亡率、LDH释放及丙二醛 (MDA)的生成 ,且能明显提高抗氧化酶的活性。结论 :银杏内酯B可拮抗H2 O2 引起的PC12细胞损伤 ,其机理可能与银杏内酯B减少脂质过氧化物的生成 ,提高抗氧化酶的活性有关     

Value of D-Dimers in patients with acute aortic dissection

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.     

Research of combined liver-kidney transplantation model in rats

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.     

BLOOD PRESSURE CHANGE WITH AGE IN SALT-SENSITIVE TEENAGERS

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.     

安心颗粒对急诊经皮冠状动脉介入术后生活质量影响的研究

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.     

The comparative studies of the influences of Urapidil and Nicardipine on sino-atrial node function, atrio-ventricular node function and hemodynamics

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.     

Expression of OPGmRNA and ODFmRNA in the patients of hip fracture due to osteoporosis

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.     

The clinicopathological and immuohistochemical analysis of solid-pseudopapillary tumor of the pancreas： report of 9 cases

Objective：To investigate the clinical features, pathological characteristics and immunophenotype of solid-pseudopapillary tumor of the pancreas（SPTP）. Methods：Nine surgically treated cases of SPTP were retrospectively reviewed. Hematoxylin and Eosin（HE） staining and immunohistochemical staining were used to analyze all cases, and the general clinical data was collected. Results：Six patients were asymptomatic except for a palpable mass. Two patients complained of vague-epigastric pain. One patient appeared jaundice. The tumor was encapsulated and solid tissues alternately with cystic tissues. Histologically, the histological structure of solid portion was pseudopapillary with a fibrovascular core. Tumor cells were uniform and medium-sized which were arranged in sheets ets or nests or pseudopapillary patterns. Immunohistochemical studies demonstrated that SPTP proved positive in vimentin（9/9 cases）, AAT（9/9 cases）, NSE（9/9 cases）, ACT（7/9 cases）, CK20（2/9 cases）, CgA（1/9 cases）, S-100（3/gcases）, PR（4/gcases）, Syn（3/9 cases） and CD56（5/9cases）, negative in CEA and ER. Conclusion：SPTP is a tumor predominantly occurring in young women frequently without special symptoms. This tumor has various characteristical histological patterns with different immunophenotype.     

Dynamic Changes in Serum Estradiol and Progesterone levels in Patients of Premenstrual Syndrome with Adverse Flow of Liver-qi

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.     

Real-time Three-dimensional Echocardiography in Assessment of Left Ventricular and Right Ventricular Volumes

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.     

SCREENING FOR A 21-CHROMOSOME ABNORMALITY IN PREIMPLANTED EMBRYOS OF ELDERLY WOMEN

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.