塞来昔布对宫颈癌HeLa细胞放射增敏效应的观察

目的探讨环氧合酶2(COX-2)抑制剂塞来昔布对人宫颈癌HeLa细胞株的放射增敏作用及其机制。方法MTT实验测定塞来昔布对宫颈癌HeLa细胞的毒性,筛选出塞来昔布的半数抑制浓度(IC50),实验分为不同浓度药物组(10、20、40、80μmol/L)、对照组和空白组。克隆形成实验检测20%IC50浓度的塞来昔布对He-La细胞的放射增敏作用,实验分为空白对照组、单纯放射组(2、4、68、Gy)、单纯加药组(药物浓度为20%IC50)、放射加药组(20%IC50药物浓度+2、4、68、Gy放射剂量),根据各组的克隆形成率,计算放射敏感性相关参数;流式细胞仪(FCM)分析细胞周期的分布情况,实验分为对照组和药物组(药物浓度为20%IC50)。结果MTT实验显示塞来昔布对HeLa细胞毒性呈现出浓度和时间依赖性,72 h的IC50是44μmol/L;克隆形成实验显示,放射加药组与单纯放射组相比,反映放射敏感性的指标平均致死剂量(D0)、准域剂量(Dq)、2 Gy照射的存活分数(SF2)均下降,放射增敏比(SER)升高。流式细胞术检测细胞周期S期细胞明显减少,G0~G1期细胞增多,细胞阻滞于G1期。结论塞来昔布能增强宫颈癌HeLa细胞的放射敏感性,其机制可能与促进细胞凋亡、抑制肿瘤细胞亚致死性损伤修复和促进肿瘤细胞周期再分布有关。     

吉西他滨对人子宫颈癌HeLa细胞系的放射增敏作用

目的 探讨化疗药物吉西他滨对人子宫颈癌(HeLa)细胞系的放射增敏作用.方法 MTT法确定细胞抑制率≤10%的吉西他滨(dFdC)浓度(IC10),用该浓度吉西他滨分别孵育细胞4、8、12及24h,于弃药前、弃药后立刻及弃药后12h,分别行2、4及6 Gy 60Co γ线照射.计数细胞存活分数,计算增敏比.结果 吉西他滨IC10浓度为0.01μmol/L,该浓度吉西他滨分别作用于细胞4、8、12及24 h,弃药后立刻照射,增敏比分别为1.19、1.35、1.72、1.93.作用24h,弃药前、弃药后立刻及弃药后12 h照射,增敏分别为1.91、1.93、1.52.结论 吉西他滨对HeLa细胞具有放射增敏作用.增敏作用随药物作用时间的延长而增加,持续作用短时间(4 h)就可产生放射增敏作用,作用24 h效果显著.弃药前照射及弃药后立刻照射,增敏效果好于弃药后12 h照射.     

三氧化二砷对胃癌细胞放射增敏作用的研究

目的探讨三氧化二砷（As2O3）是否对胃癌细胞有放射增敏作用。方法以人胃癌细胞株SGC-7901为研究对象,所有实验均重复3次,取其均值为最终结果。①四甲基四氮唑盐比色法（MTT法）检测As2O3的单药毒性,确立细胞半数抑制浓度（IC50）,并行单纯照射组及As2O3＋照射组MTT检测,计算q值大小。②放射增敏实验分成空白对照组、单纯给药组、单纯照射组及As2O3＋照射组,采用平板克隆形成分析法计算各组细胞存活分数（SF）,运用＂多靶单击数学模型＂拟合细胞存活曲线,得出平均致死剂量（Do）、准阈剂量（Dq）、放射增敏比（SER）,并观察单纯照射组及As2O3＋照射组对肿瘤细胞的杀伤作用。结果胃癌细胞株SGC-7901细胞IC50值为12.65μmol/L,与单纯照射组及单纯给药组相比,As2O3与放射治疗联合作用能显著抑制SGC-7901细胞的增殖,并显示出As2O3与放射治疗的协同作用（q〉1.15）。单纯照射组Do、Dq分别为2.75、2.52Gy,2μmol/LAs2O3＋照射组Do、Dq、SER（Do值比）、SER（Dq值比）分别为2.18Gy、1.89Gy、1.26、1.33,5μmol/LAs2O3＋照射组Do、Dq、SER（Do值比）、SER（Dq值比）分别为1.78Gy、1.72Gy、1.54、1.51。结论As2O3对人胃癌细胞株SGC-7901有一定的放射增敏作用,为临床放疗及与As2O3联合运用提供了实验依据。     

青蒿素对人宫颈癌细胞的毒性和放射增敏研究

目的探讨青蒿素对宫颈癌细胞系HeLa的毒性和放射增敏作用。方法采用MTT法检测青蒿素对HeLa细胞的毒性,测出青蒿素的最适作用浓度和作用时间。用MTT法检测青蒿素对HeLa细胞放射增敏的影响,用多靶单击方程拟合HeLa细胞的剂量存活曲线求出辐射增敏比,评价增敏效果。用流式细胞仪检测细胞周期。结果青蒿素与HeLa细胞作用24h的IC50为600.19nmol/ml,作用48h的IC50为160.71nmol/ml。青蒿素对HeLa细胞的辐射增敏比（SER）为1.17。单放组和增敏组放疗后24h的周期变化,不同照射剂量的增敏组G2/M期比例下降。结论青蒿素对宫颈癌细胞系HeLa有毒性作用,且有剂量依赖性和时间依赖性。青蒿素对HeLa细胞有放射增敏性,青蒿素能抑制电离辐射诱导的G2期阻滞。     

4-羟苯基维胺脂对宫颈癌HeLa细胞系的放射增敏作用

目的探讨4-羟苯基维胺脂(4-HPR)对HeLa细胞生长抑制和凋亡的影响;研究小剂量4-HPR对HeLa细胞的放射增敏效应。方法用四甲基偶氮唑蓝比色法(MTT)观察4-HPR对HeLa细胞的生长抑制情况;电镜观察4-HPR、放疗处理后HeLa细胞超微结构的改变;流式细胞仪检测单用4-HPR、γ-射线以及2者联合使用时HeLa细胞凋亡率和细胞周期变化。结果4-HPR和2 Gy60Co照射单独作用均可引起HeLa细胞超微结构改变,发生早期凋亡,4-HPR低剂量组(1μmol.L-1,2μmol.L-1)、单纯放射组与无药对照组凋亡率比较无统计学差异(P>0.05);4-HPR 4μmol.L-1组与无药对照组有显著性差异(P<0.01)。2 Gy60Co照射和4-HPR(2μmol.L-1,4μmol.L-1)联合使用细胞凋亡率较单纯放射组凋亡率有显著性差异(P<0.05,P<0.01);4-HPR作用后,HeLa细胞周期发生变化,表现为G1期减少,S期增加。结论4-HPR可诱导肿瘤细胞凋亡,小剂量4-HPR可增加HeLa细胞对放疗的敏感性。     

食管肿瘤干细胞抗辐射特性的实验研究

目的 :探讨食管肿瘤干细胞的抗辐射特性。方法 :采用无血清培养基培养人食管癌细胞ECA109,分离食管肿瘤干细胞,MTT法检测不同浓度环氧化酶-2选择性抑制剂NS398(2.5、5.0、10.0、20.0、40.0、80.0μmol/L)对细胞增殖的抑制作用,克隆形成实验检测亲本细胞和细胞球的增敏效应,成球实验分析NS398联合X线照射对细胞成球能力的影响,Western blot检测细胞β-catenin蛋白的表达水平。结果:NS398对亲本细胞和细胞球的增殖抑制作用均具有时间、浓度依赖性。20μmol/L NS398作用后,亲本细胞Do、Dq和SF2值均减小(P<0.05),放射增敏比(sensitization enhancement ratio,SER)为1.17;20μmol/L NS398作用后,细胞球Do、SF2减小(P<0.05),SER为1.12。照射使ECA109细胞成球率增加(P<0.05)。NS398联合X线照射组与单纯照射组相比,细胞成球率显著降低(t=7.01,P<0.01),亲本细胞和细胞球β-catenin的表达水平均降低(t=10.15,P<0.01;t=3.225,P<0.05)。结论 :细胞球的增敏效应小于亲本细胞,具有抗辐射特性,其机制可能与抑制细胞β-catenin蛋白表达有关。     

白藜芦醇抑制HeLa细胞增殖及其作用机制

目的研究白藜芦醇(Res)对宫颈癌HeLa细胞体外生长抑制作用及其机制。方法以17.5、35.0、70.0、140.0μmol/L Res分别处理HeLa细胞24、48与72 h,采用MTT法检测HeLa细胞存活率;应用70μmol/L的Res处理HeLa细胞24 h,采用Western Blot检测HeLa细胞中磷酸化真核细胞翻译起始因子4E(p-eIF4E)、磷酸化4E结合蛋白1(p-4E-BP1)和半胱氨酸蛋白酶蛋白3(caspase-3)的表达。结果不同浓度的Res作用不同时间后HeLa细胞增殖受到明显抑制,且呈时间和剂量依赖性,在相同时间内,随着Res浓度的增加,HeLa细胞的增殖抑制率明显升高(F=93.76~637.22,P<0.01);在同一浓度时,随着Res作用时间的延长,HeLa细胞的增殖抑制率也明显升高(F=8.79~29.99,P<0.01)。70μmol/L的Res作用HeLa细胞24 h后,HeLa细胞中p-eIF4E、p-4E-BP1蛋白表达较对照组减少(t=14.93、4.78,P<0.01),caspase-3蛋白表达较对照组增加(t=10.68,P<0.01)。结论 Res对宫颈癌HeLa细胞体外生长有明显抑制作用,其机制可能与抑制p-eIF4E、p-4E-BP1表达,并诱导caspase-3活化,从而增加HeLa细胞凋亡有关。     

冬凌草甲素对肝癌HepG2细胞株体外放射增敏作用

目的观察冬凌草甲素对肝癌细胞株体外的放射增敏作用。方法对肝癌细胞系（HepG2）进行克隆形成实验。照射前用1.804、3.608、5.412、7.216、18.040μmol/L冬凌草甲素处理HepG2细胞6～72h,然后分别给予0、1、2、3、4、5、6Gy的^60Co照射,观察细胞存活率,计算放射增敏比（SER）。并运用常规照射剂量2Gy时的放射增敏比（SERSF2）作为评价指标。结果冬凌草甲素可提高HepG2细胞的放射敏感性,并呈时间、浓度依赖关系。照射前用1.804μmol/L冬凌草甲素处理HepG2细胞6～72h,在6、12和24h未观察到放射增敏作用,放射增敏作用仅在48和72h出现。当高浓度冬凌草甲素（18.040μmol/L）处理HepG2细胞6、12和24h,各时间点均可见放射增敏效应。结论冬凌草甲素可能是一种肝癌放射增敏剂。     

Disulfiram 联合Cu对耐药白血病细胞的作用及与JNK通路的关系

目的研究disulfiram(DS)联合Cu(DS/Cu)对耐药白血病细胞株HL60/ADM的逆转耐药作用及与JNK通路的关系。方法MTT法检测DS/Cu对HL60/ADM细胞的增殖抑制作用;选取DS/Cu对HL-60/ADM无明显杀伤作用的IC20值作为逆转浓度,MTT法检测IC20浓度DS/Cu联合不同浓度ADM处理24h后的IC50值;流式细胞仪检测阿霉素、DS/Cu单药及DS/Cu与阿霉素联合处理HL-60/ADM24h凋亡细胞比例的变化;Westernblotting检测c-jun表达的变化。结果DS/Cu对HL60/ADM细胞具有显著的增殖抑制作用,处理24hIC50为(1.11±0.025)μmol/L。HL-60/ADM细胞经IC20浓度(0.63μmol/L)DS/Cu处理24h后,ADM的IC50值从(7.69±1.87)降到(0.48±0.021)μg/mL,逆转倍数为15.95倍(P=0.003)。0.63μmol/L的DS/Cu、1.25μg/mL的阿霉素单药及上述浓度的DS/Cu联合阿霉素作用HL60/ADM细胞24h后,联合组凋亡细胞比例较DS/Cu或阿霉素单药组均显著增多(P<...     

小剂量顺铂连续化疗对鼻咽癌CNE-1细胞放射敏感性影响的体外研究

目的以小剂量顺铂连续化疗模拟节律化疗方式,采用细胞培养方法研究此种给药方式对鼻咽高分化鳞癌细胞株CNE-1细胞放射敏感性的影响,为临床鼻咽癌同步放化疗探索一种新的高效低毒的治疗模式。方法 MTT方法检测顺铂对鼻咽癌CNE-1细胞的半抑制浓度(IC50),1/5IC50为小剂量化疗参考剂量,而IC70则为MTD化疗参考剂量。细胞分4组进行如下处理:A组剂量为1/5IC50的顺铂连续作用96h后进行放疗;B组剂量为IC70的顺铂连续作用3h后立即给予放疗;C组为IC70作用3h后间隔93 h进行放疗;D组为未加入顺铂化疗的鼻咽癌细胞株同样条件下培养96h后进行放疗。克隆形成实验计算细胞存活率,采用单击多靶模型绘制剂量存活曲线,比较各处理组辐射敏感性变化。结果顺铂对鼻咽癌CNE-1细胞株作用72h的IC50值为0.26μg/ml,1/5IC50为0.05μg/ml,IC70为0.72μg/ml。采用单击多靶模型计算各处理组的SF2值与SER值如下:A组SF2为(0.414±0.008),SER值为(1.429±0.110);B组SF2值为(0.502±0.010),SER值为(1.012±0.129);C组SF2值为(0.411±0.014),SER值为(1.400±0.169);D组SF2为(0.603±0.100)。结论采用类似节律化疗方式给药,与放疗联用可以引起CNE-1细胞株放射敏感性增高。     

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.     

APPLICATION OF LORNOXICAM TO PATIENT-CONTROLLED ANALGESIA IN PATIENTS UNDERGOING ABDOMINAL SURGERIES

FOR anesthesiologis s ,treatingpostoperativepainhas alwaysbeen a problem.Althoughopioidshave been provedtobe effective,theirsideeffectscouldnotbeignored.With thedevelopmentofscienceand pharmacology,many drugs with aspectsof satisfactoryanalgesicefficacyand couldbe welltoleratedby patientshave been developed.And lornoxicamisone of them, which isa non-steroidalanti-inflammatorydrug (NSAID ), with analgesic, anti-infl-ammatory,andantipyreticproperties.Itseliminationhalf-time(3 to 5 hours) isle…     

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.