丙烯酰胺对SH-SY5Y神经细胞凋亡和 miR-21表达的影响

目的:探讨丙烯酰胺(AA)对人SH-SY5Y神经细胞凋亡和miR-21表达的影响?方法:不同浓度丙烯酰胺作用于人神经母细胞瘤SH-SY5Y细胞24 h后,采用四甲基偶氮唑盐(MTT)法测定丙烯酰胺对SH-SY5Y细胞活力的影响,Hoechst 33258荧光染色法检测细胞凋亡,real-time PCR检测miR-21表达水平,Western blot检测PTEN?p-AKT?AKT?Bcl-2?Bax?caspase 9 和caspase 3蛋白表达?结果:丙烯酰胺剂量依赖性地降低SH-SY5Y细胞活性,Hoechst 33258染色显示明显细胞凋亡形态变化;丙烯酰胺显著降低SH-SY5Y细胞miR-21的表达,同时升高PTEN?Bax?caspase 9?caspase 3水平并降低p-AKT和Bcl-2表达?结论:丙烯酰胺可通过线粒体途径诱导SH-SY5Y神经细胞凋亡,其机制可能与丙烯酰胺引起miR-21表达下调有关?     

外源性antizyme1基因转染对SH-SY5Y细胞的生物学影响

目的 研究antizyme 1(AZl)基因对成人神经廇SH-SY5Y细胞增殖、细胞周期及凋亡的影响.方法 将构建好的AZ1基因重组真核表达载体pAZ1m稳定转染SH-SY5Y细胞.通过MTT法检测细胞增殖变化,流式细胞术分析AZ1转染对细胞周期及凋亡的影响.RT-PCR与Western blotting检测AZ1基因转染对cyclin D1和caspase-3表达的影响,caspase-3试剂盒检测酶活性变化.结果 稳定转染SH-SY5Y细胞后,检测结果显示AZ1基因转染能够减慢SH-SY5Y细胞增殖速度,并使细胞停滞于G0/G1期.在cyclin D1基因表达抑制的同时,caspase-3基因表达上调.酶活性测定显示Caspase-3活性上升.结论 AZ1基因能够抑制SH-SY5Y细胞增殖,通过降低cyclin D1的表达阻滞细胞周期于G0/G1期,并上调caspase-3表达促进SH-SY5Y细胞凋亡.     

MAPK磷酸酯酶-1通过抑制JNK和p38的磷酸化调节SH-SY5Y神经母细胞瘤的凋亡

目的研究MKP-1在SH-SY5Y神经母细胞瘤中的抗凋亡。方法建立稳定表达MKP-1的SH-SY5Y细胞,用H2O2诱导细胞凋亡,并通过Western blotting比较分析MKP-1的表达对JNK和p38磷酸化的调节。结果①H2O2诱导SH-SY5Y细胞表达MKP-1,同时导致JNK和p38的去磷酸化;②在稳定表达MKP-1的SH-SY5Y细胞中,MKP-1可以抑制JNK和p38的磷酸化。③稳定表达MKP-1的SH-SY5Y细胞抵抗H2O2诱导细胞凋亡的能力比对照细胞提高了1倍左右。结论MKP-1对神经细胞的凋亡具有重要的调节作用,提示MKP-1作为调节ERK、JNK和p38蛋白激酶信号途径的重要分子,可能对退行性神经系统疾病的发病机制和治疗有重要的作用。     

钙稳态失衡在1-甲基-4-苯基吡啶离子诱导的人神经母细胞瘤SH-SY5Y细胞凋亡中的作用

目的研究钙稳态失衡在1-甲基-4-苯基吡啶离子（MPP+）诱导SH-SY5Y细胞凋亡中的作用。方法MTT法检测细胞存活
率;Hoechst 33342 和Annexin V+PI 染色检测MPP+诱导人神经神经母细胞瘤SH-SY5Y细胞的凋亡作用;Western blot 检测
PARP蛋白表达的变化;罗丹明123 染色检测MPP+对SH-SY5Y细胞线粒体膜电位的影响;激光共聚焦显微镜检测MPP+对
SH-SY5Y细胞胞质钙、线粒体钙和内质网钙浓度的影响以及线粒体钙通道抑制剂钌红与MPP+联合应用对线粒体游离钙浓度、
胞质游离钙浓度的影响。结果MPP+导致SH-SY5Y细胞存活率下降且具有剂量-反应关系、MPP+能导致SH-SY5Y细胞凋亡、
MPP+导致SH-SY5Y细胞线粒体膜电位下降、MPP+使SH-SY5Y细胞胞质和内质网游离钙离子浓度下降而使线粒体游离钙离子
浓度上升。钌红可对抗MPP+诱导的SH-SY5Y细胞凋亡、阻止线粒体膜电位下降,减少PARP的切割片段以及阻断线粒体游离
钙浓度的上升。结论线粒体钙超载在MPP+诱导的SH-SY5Y细胞凋亡中起重要作用。MPP+诱导人神经母细胞瘤SH-SY5Y细
胞的凋亡可能与细胞质、线粒体及内质网的钙稳态失衡有关。
     

利福平对鱼藤酮诱导的神经细胞SH-SY5Y凋亡的抑制作用

目的 探讨利福平对鱼藤酮所诱导的人多巴胺能神经母细胞瘤细胞SH-SY5Y凋亡的抑制作用.方法 采用100 nmol/L鱼藤酮作用SH-SY5Y细胞24 h,建立SH-SY5Y细胞凋亡模型;再用100、200、300 μmol/L不同浓度的利福平进行干预,采用MTT比色法检测细胞活性,采用流式细胞术(FCM)及原位缺口末端标记染色法(TUNEL)检测细胞凋亡, Western blot法检测前凋亡蛋白3-磷酸甘油醛脱氢酶(GAPDH)的表达水平.结果 用100 nmol/L鱼藤酮作用SH-SY5Y细胞24 h,能够诱导该细胞产生凋亡并降低其活性;利福平干预后,鱼藤酮所诱导的SH-SY5Y细胞凋亡被抑制,并且这一抑制作用与利福平浓度有明显的剂量-效应关系;而且利福平干预后能降低GAPDH蛋白的表达水平.结论 利福平对鱼藤酮诱导的SH-SY5Y细胞凋亡具有明显的抑制作用,这一抑制作用可能是通过下调GAPDH蛋白的表达而得以实现.     

远志皂苷调节细胞自噬抗Aβ25-35诱导的SH-5Y5 Y细胞凋亡的研究

目的 从细胞自噬角度探讨远志皂苷(tenuifolin,Ten)抑制Aβ25-35诱导SH-SY5Y细胞凋亡的作用及分子机制.方法 建立Aβ25-35诱导的SH-SY5Y细胞损伤模型,通过MTT法和流式细胞术测定细胞活力和凋亡率,单丹磺酰尸胺(MDC)染色检测自噬小泡的变化,Western blot检测LC3-Ⅱ/LC3-Ⅰ蛋白表达水平的变化.结果 Ten抑制Aβ25-35诱导SH-SY5Y细胞活力降低及凋亡率增加,减少Aβ25-35诱导的自噬体增加,显著降低自噬蛋白LC3-Ⅱ/LC3-Ⅰ的表达水平.结论 Ten通过调节Aβ25-35诱导的细胞自噬,从而抑制Aβ25-35诱导的SH-SY5Y细胞凋亡,发挥神经保护作用.     

外源性一氧化碳对体外培养的SH-SY5Y细胞的影响

目的 研究不同浓度的外源性一氧化碳(CO)对体外培养的神经细胞SH-SY5Y的影响,进一步探讨CO中毒脑损伤的机制.方法 SH-SY5Y细胞在含有不同浓度CO的装置中培养12 h,然后用MTT法检测细胞存活率,DNA琼脂糖凝胶电泳和流式细胞仪检测细胞凋亡的发生,以激光共聚焦显微镜荧光染色法检测细胞内活性氧的产生和线粒体膜电位的变化,用荧光酶标仪测定caspase-3的活性,并用Western印迹的方法 检测Bax蛋白的表达水平.结果 1000、10000 ppm CO处理SH-SY5Y细胞12 h后显著降低细胞的存活率;诱导细胞发生凋亡,凋亡率分别达29.03%和41.67%;激光共聚焦显微镜结果 细胞内活性氧水平及caspase-3的活性显著升高;线粒体膜电位明显降低,红/绿荧光强度的比值由正常的5.97分别降低为1.56±0.07和0.34±0.02;而且细胞中Bax蛋白表达水平显著升高.而100 ppm CO对体外培养的SH-SY5Y细胞的存活率、caspase-3的活性、活性氧水平、线粒体膜电位以及Bax蛋白的表达无明显影响.结论 高浓度的外源性CO(1000、10 000ppm)对体外培养的SH-SY5Y细胞造成损伤,具有明显的细胞毒性;而低浓度的CO(100 ppm)对SH-SY5Y细胞没有明显的损伤作用.     

抗肿瘤药物诱导NK/T细胞淋巴瘤细胞株凋亡的研究

目的 探讨不同化疗方案对NK/T细胞淋巴瘤细胞株(SNK6)的抑制率,并对其可能的相关机制进行研究.方法 应用四甲基偶氮唑盐(MTT)法、流式细胞仪检测、琼脂糖凝胶电泳检测等方法,研究不同化疗药物对SNK6细胞的诱导凋亡作用;蛋白印迹法检测自噬蛋白Beclin-1、LC3Ⅱ表达,流式细胞仪检测细胞凋亡情况.结果 作用肿瘤细胞48 h的各药物的抑制率与24 h所得的抑制率相比,差异有统计学意义(P＜0.05);作用72 h的各药物抑制率与作用48 h相比,差异无统计学意义(P＞0.05).4组化疗方案抑制率由高到低为:长春瑞滨+表柔比星、多西他赛+表柔比星、多西他赛+多柔比星、长春瑞滨+多柔比星;从实验组细胞中提取的DNA经电泳,紫外灯下可见“梯状带”.进行蛋白印迹法及流式细胞仪检测,抗肿瘤药物联合自噬抑制剂使自噬蛋白下调,细胞凋亡与对照组比较差异有统计学意义(P＜0.05).结论 长春瑞滨联合表柔比星诱导SNK6细胞凋亡作用最佳,3-MA抑制SNK6细胞对化疗药物保护性自噬反应,增加SNK6细胞对抗肿瘤药物细胞毒杀伤作用的敏感性.     

汉防己甲素对人神经母细胞瘤SH-SY5Y增殖和凋亡的影响

目的 探讨汉防己甲素对神经母细胞瘤SH-SY5Y细胞株的增殖抑制和诱导凋亡的作用。方法 通过CCK-8实验检测汉防己甲素对于细胞生长的抑制率,流式细胞术检测Tet作用于细胞后,对细胞活性氧、线粒体膜电位、凋亡和周期的影响。结果 汉防己甲素能显著抑制SH-SY5Y细胞生长,基本呈时间－剂量依赖性。流式细胞术检测显示不同浓度汉防己甲素处理后,活性氧明显升高,线粒体膜电位明显下降,细胞凋亡比例明显升高,G₀/G₁期细胞占比明显增高。结论 汉防己甲素能够抑制SH-SY5Y细胞增殖并且诱导其发生凋亡。     

七氟醚联合顺铂激活IP3R-1依赖的人神经母细胞瘤细胞凋亡

目的 探讨吸入七氟醚对低浓度顺铂预处理的人神经母细胞瘤(SH-SY5Y)细胞增殖活性的影响,并讨论相关机制。方法 建立低浓度顺铂预处理细胞模型,噻唑蓝比色法检测不同浓度梯度七氟醚对SH-SY5Y细胞增殖活性的影响,利用Western blotting检测Caspase-3和LC3Ⅱ蛋白表达,利用钙成像技术分析细胞内钙离子浓度变化。结果 低浓度顺铂预处理后,0.6%七氟醚对SH-SY5Y细胞增殖活性未产生影响,但可诱导细胞LC3-Ⅱ表达增加,而1.7%七氟醚显著抑制SH-SY5Y细胞增殖活性(P<0.01),诱导LC3-Ⅱ和Caspase-3表达增加(P<0.01),并且增加胞内钙离子浓度(P<0.01);当部分干扰IP₃R-1表达后,1.7%七氟醚诱发的LC3-Ⅱ和Caspase-3表达减少(P <0.05)。结论 1.7%七氟醚诱导低浓度顺铂预处理SH-SY5Y增殖活性的降低,可能与IP₃R-1介导胞内钙离子浓度变化致细胞凋亡增加以及自噬水平增强有关。     

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.     

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.     

Scientific principles and rigorous processes should be followed in developing clinical guidelines for therapeutic interventions of integrative medicine

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.