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1.
目的探讨染料木黄酮诱导前列腺癌细胞系DU-145细胞凋亡的作用。方法在Caspase抑制剂Z-VAD存在或不存在的情况下,以染料木黄酮作用于前列腺癌DU-145细胞,采用MTT法检测细胞存活率、Annexin V-FITC/PI双染法流式细胞术检测细胞凋亡、PI染色法流式细胞术检测细胞周期、JC-1染色法流式细胞术测定细胞线粒体膜电位(△ψm),比色检测试剂盒测定caspase-8活性。结果染料木黄酮能明显降低前列腺癌DU-145细胞的存活率、诱导癌细胞凋亡、降低△ψm及提高caspase-8活性(全部P0.05)。Z-VAD能够逆转Gen抗前列腺癌的效应。结论染料木黄酮使细胞阻滞于G0和G1,分别通过凋亡信号通路的外源性和内源性途径,诱导前列腺癌细胞凋亡。  相似文献   

2.
目的探讨米非司酮在体外诱导雄激素非依赖性前列腺癌DU-145、PC-3细胞凋亡的作用。方法采用四甲基偶氮唑蓝法检测1,10,50和100μmol/L米非司酮作用于前列腺癌DU-145、PC-3细胞24~120h的吸光度(A)值,用流式细胞仪检测10μmol/L米非司酮作用24和48h后DU.145、PC-3细胞凋亡率的变化;采用免疫组化法检测米非司酮作用DU-145、PC.3细胞后bax、bcl-2、血管内皮生长因子(VEGF)蛋白表达的变化。结果1μmol/L米非司酮组的A值与对照组相比,差异无统计学意义(P〉0.05);10,50和100μmol/L米非司酮组的A值与对照组比较,差异有统计学意义(P〈0.01);米非司酮对前列腺癌DU-145、PC-3细胞的抑制作用呈时间-剂量依赖性。10μmol/L米非司酮作用前列腺癌DU-145细胞24和48h的凋亡率分别为15.3%和30.4%,PC-3细胞的凋亡率分别为22.2%和32.0%。经10μmol/L米非司酮作用后,DU-145、PC-3细胞中VEGF和bcl-2蛋白的表达明显减少,而bax的表达显著增加(P〈0.05)。结论米非司酮以时间.剂量依赖性方式抑制激素非依赖性前列腺癌DU-145和Pc-3细胞的增殖,其作用可能是通过降低VEGF蛋白的表达。从而下调bcl-2、激活bax蛋白的表达来实现。  相似文献   

3.
目的探讨具有扶正抑瘤功效的中药复方对人前列腺癌DU-145细胞凋亡的影响作用及机制。方法采用体外细胞培养的研究方法,用25μl/mL、50μl/mL、100μl/mL、200μl/mL的中药复方干预DU-145细胞生长48h。以流式细胞仪检测细胞凋亡情况并计算凋亡率;以免疫细胞化学法和MIAS图像分析系统检测Bax、Capase-3和TNF-α3种凋亡相关蛋白的表达情况。结果中药复方作用DU-145细胞48h后,DU-145细胞生长呈抑制状态,细胞凋亡百分率增高(P0.05或P0.01),并呈一定的量效关系;细胞3种凋亡相关蛋白Bax,Caspase-3和TNF-α表达均增高(P0.05或P0.01)。结论中药复方可抑制DU-145细胞增殖,并诱导DU-145细胞凋亡,其机制与"线粒体通路"中Bax、Caspase-3表达增高以及"死亡受体通路"中TNF-α表达增高有关。  相似文献   

4.
姜黄素对雄激素依赖性前列腺癌细胞的诱导凋亡作用   总被引:6,自引:3,他引:3  
目的:探讨姜黄素对雄激素依赖性前列腺癌细胞株(LNCaP)的诱导凋亡作用。方法:分别用10、25、50、75、100μmol/L浓度的姜黄素作用于LNCaP细胞,5、12、24 h后MTT法检测细胞生长活性;24 h后流式细胞仪测定细胞周期及细胞凋亡的变化,透射电镜观察细胞超微结构变化;5 h后W estern印迹法检测细胞内IκBα的表达。结果:姜黄素能显著抑制LNCaP细胞的生长,呈剂量与时间依赖性,不同浓度姜黄素组之间与不同作用时间组之间的差异均有显著性意义(P均<0.05)。姜黄素诱导LNCaP细胞出现剂量依赖性G2/M期阻滞(P<0.01),各浓度组凋亡细胞比例均显著高于空白对照组(P均<0.05),差异有显著性意义;姜黄素作用24 h后LNCaP细胞出现凋亡的形态学改变;不同浓度姜黄素作用后,LNCaP细胞内IκBα的表达无变化。结论:姜黄素能显著抑制LNCaP细胞的体外生长,并促进其凋亡。  相似文献   

5.
目的探讨三氧化二砷(As2O3)对前列腺癌非雄激素依赖细胞系DU-145细胞的增殖抑制作用及对细胞周期和凋亡的影响.方法应用体外细胞生长抑制试验(MTT比色法)研究As2O3对DU-145细胞生长的影响,流式细胞仪检测细胞周期分布情况及凋亡情况,琼脂糖凝胶电泳检测细胞DNA的变化.结果As2O3对DU-145细胞的增殖有明显的抑制作用,随着药物浓度增加和作用时间延长,凋亡细胞明显增加,出现G2/M期阻滞和DNA的断裂.结论As2O3可明显抑制前列腺癌DU-145细胞的增殖,诱导细胞凋亡,抑制细胞周期.  相似文献   

6.
目的:探讨中药肿节风溶液对人前列腺癌DU-145细胞PI3K/Akt/mTOR信号传导通路的影响.方法 采用细胞培养的方法,用不同浓度的肿节风溶液作用于DU-145细胞48h,用MTT法检测肿节风溶液对DU-145细胞增殖的影响,用RT-PCR检测用药后细胞PI3K、Akt、mTOR和P70(S6K)的基因表达情况.结果:肿节风溶液作用48h后,DU-145细胞增殖受到抑制,并表现为量效关系;DU-145细胞的PI3K、Akt、mTOR和P70(S6K)的表达均呈不同程度的抑制,但不表现为量效关系.结论:肿节风溶液能抑制人前列腺癌DU-145细胞增殖,其抑制细胞增殖的机制与其抑制了细胞的PI3K/Akt/mTOR信号传导通路的作用有关.  相似文献   

7.
目的观察姜黄素对雄激素非依赖性前列腺癌细胞株PC3细胞的生长抑制作用。方法10~100μmol姜黄素作用PC3细胞5~24h后,溴化二甲噻唑二苯四氮唑(MTT)比色法检测细胞生长活性,流式细胞仪检测细胞周期时相及细胞凋亡变化,透射电镜观察细胞超微结构变化,Western印迹法检测细胞内IκBα的表达。结果姜黄素能显著抑制雄激素非依赖性前列腺癌细胞株PC3细胞的体外生长(P<0.05),呈时间与剂量依赖性;姜黄素将PC3细胞周期阻滞于G2/M期;不同浓度姜黄素诱导PC3细胞凋亡率分别为(6.33±0.88)%、(7.53±2.32)%、(12.74±3.02)%、(18.09±2.51)%与(27.54±2.63)%(P<0.05);细胞内IκBα的表达随姜黄素剂量的增加而逐步升高(P<0.05)。结论姜黄素通过抑制PC3细胞增殖、诱导细胞凋亡等机制,显著抑制雄激素非依赖性前列腺癌细胞的体外生长。  相似文献   

8.
目的:观察前列消癥汤对前列腺癌DU-145细胞系的细胞凋亡及周期的影响,探讨前列消癥汤治疗前列腺癌的生物学机制。方法:采用流式细胞术测定不同浓度前列消癥汤对前列腺癌DU-145细胞凋亡及细胞周期分布的影响。结果:前列消癥汤在一定浓度范围内抑制DU-145细胞增殖,并呈现出一定的量效关系。与对照组比较,中、高剂量组均能够显著增加早期凋亡、晚期凋亡,具有统计学差异(中剂量组P<0.05,高剂量组P<0.01)。中剂量与高剂量组的S期细胞比例分别为(37.96±2.24)%和(43.77±2.48)%,均显著高于对照组的(31.69±1.29)%,差异有统计学意义(中剂量组P<0.05,高剂量组P<0.01)。结论:前列消癥汤能够诱导前列腺癌DU-145细胞的早期及晚期凋亡,并随着剂量的增加,促进凋亡的作用也随着增加。前列消癥汤主要抑制前列腺癌DU-145细胞从S期向G2期的转变。  相似文献   

9.
目的 观察雷公藤内酯醇(TP)对人雄激素非依赖型前列腺癌DU145细胞增殖、细胞周期及细胞凋亡的影响.方法 以不同浓度的雷公藤内酯醇作用于体外培养的DU145细胞不同的时间,四甲基偶氮唑蓝(MTT)法检测细胞增殖的情况,流式细胞仪检测细胞周期和细胞凋亡的变化.结果 20 ng/ml、40 ng/ml、80 ng/ml TP作用DU145细胞24h、48h、72h后对DU145细胞均有抑制作用,各组间有显著差异(P<0.05);24h、48h、72h IC50分别为117.95 ng/ml、47.60 ng/ml、14.43 ng/ml,TP作用DU145细胞72min后,DU145细胞被阻滞于S期,并且随浓度的加大,阻滞效果越显著;凋亡率逐渐增加.结论 TP能抑制DU145细胞的增殖,阻滞DU145细胞于S期,诱导DU145细胞调亡.  相似文献   

10.
目的 探讨姜黄素对体外、体内直肠癌CD133+肿瘤干细胞样细胞群放疗敏感性的影响.方法 采用免疫磁珠分选法对直肠癌HRT-18细胞进行干细胞分选后随机分成姜黄素组、放疗组、姜黄素联合放疗组,应用MTT法检测24、48和72 h各组细胞生长抑制情况;采用Annexin V/PI双染流式细胞仪检测各组细胞凋亡情况.将分选的CD133+直肠癌细胞移植于裸鼠右脚垫建立移植瘤模型,将模型鼠分为姜黄素组、放疗组、姜黄素联合放疗组,每组8只,观察瘤体动态生长情况并用原位末端标记技术检测瘤体内细胞凋亡情况.结果 低剂量姜黄素联合放疗对直肠癌CD133+肿瘤干细胞样细胞群(24 h生长抑制率:18.7%±1.7%)较放疗组(14.6%±1.0%)具有明显的生长抑制作用(P<0.01);姜黄素联合放疗组细胞凋亡率(28.8%±3.7%)与放疗组(13.1%±1.4%)比较差异有统计学意义(P<0.01);治疗6d时,姜黄素联合放疗组的瘤体体积为(521 ±79) mm3,与放疗组的(717 ±134) mm3比较差异有统计学意义(P<0.01);姜黄素联合放疗组瘤体细胞凋亡指数(26.1%±3.3%)较放疗组(12.0%±2.1%)明显增高,两者比较差异有统计学意义(P<0.01).结论 姜黄素可显著提高CD133+肿瘤干细胞样细胞群的放疗敏感性.  相似文献   

11.
Background : We investigated the vasopressor hormone response following mesenteric traction (MT) with hypotension due to prostacyclin (PGI2) release in patients undergoing abdominal surgery with a combined general and epidural anesthesia. Methods : In a prospective, randomized, placebo-controlled study we administered 400 mg ibuprofen (i.v.) in 42 patients scheduled for abdominal surgery. General anesthesia was combined with epidural anesthesia (T4-L1). Before as well as 5, 15, 30, 45, and 90 min after MT we recorded plasma osmolality, hemodynamics and measured 6-keto-PGFlα (stabile metabolite of PGI2), TXB2 (stabile metabolite of thromboxane A2) active renin, and arginine vasopressin (AVP) plasma concentrations by radioimmunoassay. Catecholamine levels were assessed by high-pressure liquid chromatography (HPLC) with electrochemical detection. Results : Following MT, arterial hypotension occurred along with a substantial PGI2 release. This was completely abolished by ibuprofen administration. Although plasma levels of 6-keto-PGF (1133 (708) vs. 60 (3) ng/L, median (median absolute deviation), P=0.0001, placebo vs. ibuprofen) remained significantly elevated, blood pressure was restored within 30 min after MT in the placebo group. At the same point in time plasma concentrations of TXB2 (164 (87) vs. 58 (1) ng/L, P=0.0001), epinephrine (46 (33) vs. 14 (6) ng/L, P=0.001), AVP (41 ± (18) vs. 12 (7) ng/L, P=0.0004), and active renin (27 (12) vs. 12 (4) ng/L, P = 0.001) were significantly higher in placebo-treated patients. Conclusion : Under combined general and epidural anesthesia arterial hypotension following MT due to endogenous PGI2 release is associated with enhanced release of AVP, active renin, epinephrine and thromboxane A2, presumably contributing to hemodynamic stability within 30 min after MT.  相似文献   

12.
Don Dame 《Artificial organs》1996,20(5):613-617
Abstract: Virtually all blood pumps contain some kind of rubbing, sliding, closely moving machinery surfaces that are exposed to the blood being pumped. These valves, internal bearings, magnetic bearing position sensors, and shaft seals cause most of the problems with blood pumps. The original teaspoon pump design prevented the rubbing, sliding machinery surfaces from contacting the blood. However, the hydraulic efficiency was low because the blood was able to "slip around" the rotating impeller so that the blood itself never rotated fast enough to develop adequate pressure. An improved teaspoon blood pump has been designed and tested and has shown acceptable hydraulic performance and low hemolysis potential. The new pump uses a nonrotating "swinging" hose as the pump impeller. The fluid enters the pump through the center of the swinging hose; therefore, there can be no fluid slip between the revolving blood and the revolving impeller. The new pump uses an impeller that is comparable to a flexible garden hose. If the free end of the hose were swung around in a circle like half of a jump rope, the fluid inside the hose would rotate and develop pressure even though the hose impeller itself did not "rotate"; therefore, no rotating shaft seal or internal bearings are required.  相似文献   

13.
Background : Our objective was to determine whether administration of propranolol or verapamil modifies the hemodynamic adaptation to continuous positive-pressure ventilation (CPPV), in particular the regional distribution of cardiac output (CO).
Methods : General hemodynamics and regional blood flows assessed by microsphere technique (15 (μm) were recorded in 16 anesthetized pigs during spontaneous breathing (SB) and CPPV with 8 cm H2O end-expiratory pressure (CPPV8) before and after intravenous administration of propranolol (0.3 mg · kg−1 followed by 0.15 mg · kg−1 · h−1, n=8) or verapamil (0.1 mg · kg−1 followed by 0.3 mg · kg−1 · h−1, n=8).
Results : CPPV8 depressed CO by 25% without shifts in its relative distribution with the exception of a noteworthy increase in adrenal perfusion. Propranolol increased arterial blood pressure, and due to a fall in heart rate, CO dropped by 25%. The kidneys and, to a lesser extent, the splanchic region and central nervous system received increased fractions of the remaining CO at the expense of skeletal muscle flow. Similar patterns were seen during SB and CPPV8 such that the combination of propranolol and CPPV8 depressed CO by 50%. The circulatory effects of verapamil were less evident but myocardial perfusion tended to increase.
Conclusions : The combination of propranolol or verapamil with CPPV does not result in any specific hemodynamic interaction in anesthetized pigs, except that the combined effect of propranolol and CPPV may severely reduce CO.  相似文献   

14.
Abstract: A variety of protein-bound or hydrophobic substances, accumulating as a result of pathologic conditions such as exogenous or endogenous intoxications, are removed poorly by conventional detoxification methods because of low accessibility (hemodialysis), insufficient adsorption capabilities (hemosorption), low efficiency (peritoneal dialysis), or economic limitations (high-volume plasmapheresis). Combining advantages of existing methods with microspheric technology, a module-based system was designed. Major operating parameters of the latter can be modified to allow for adjustment to individual clinical situations. An extracorporeal blood circuit including a plasmafilter is combined with a secondary high-velocity plasma circuit driven by a centrifugal pump. Different microspheric adsorbers can be combined in one circuit or applied in sequence. Thus, a prolonged treatment can be tailored using specially designed selective adsorber materials. Comparing this system with existing methods (high-flux hemodialysis, molecular adsorbent recycling system), results from our in vitro studies and animal experiments demonstrate the superior efficiency of substance removal.  相似文献   

15.
Background : Inhibitory effects of volatile anaesthetics on platelet aggregation have been demonstrated in several studies. However, the influence of volatile anaesthetics on intracoronary platelet adhesion has not been elucidated so far.
Methods : Isolated hearts of guinea pigs were perfused with buffer in the absence or presence of volatile anaesthetics (0.5 and 1 MAC) at constant coronary flow rates of 5 ml/min for 25 min, then 1 ml/min for 30 min and again 5 ml/min for 10 min. Before, during and after low-flow perfusion, a bolus of human platelets was applied into the coronary system. To simulate thrombogenic conditions, 0.3 U/ml human thrombin was infused during low-flow perfusion and reperfusion. The number of platelets sequestered to the endothelium was calculated from the difference between coronary in- and output of platelets. The myocardial production of lactate and consumption of pyruvate and coronary perfusion pressure were also determined.
Results : At a flow rate of 5 ml/min only about 3% of the applied platelets did not emerge from the coronary system, in any group. In contrast, 13.1±1.2% (mean±SEM) of infused platelets became adherent in low-flow perfusion in the control group without anaesthetic. The adherence was reduced with each 1 MAC isoflurane (to 6.2±1.2%), sevoflurane (to 4.4±0.9%) or halothane (to 3.2±1.5%) (each P <0.05 vs. control). Volatile anaesthetic, 0.5 MAC, did not inhibit platelet adhesion to a statistically significant extent in any case. Perfusion pressure and metabolic parameters were not statistically different between the control and the hearts exposed to anaesthetics.
Conclusion : Volatile anaesthetics in a concentration of 1 MAC can reduce the adhesion of platelets in the coronary system under reduced flow conditions. This action does not arise from vasodilation or inhibition of ischaemic stress.  相似文献   

16.
Background: Halothane inhibits in vitro and in vivo activity of cytochrome P-450 (CYP) 2E1. There are several fluorinated volatile anaesthetics besides halothane, and most of them are defluorinated by CYP2E1. It is unclear whether other fluorinated anaesthetics inhibit the in vivo activity of CYP2E1.
Methods: We compared the inhibitory effects of therapeutic concentrations of four inhalational anaesthetics, halothane, enflurane, isoflurane, and sevoflurane, on chlorzoxazone metabolism in rabbits receiving artificial ventilation.
Results: All four inhalational anaesthetics decreased arterial blood pressure and increased plasma chlorzoxazone concentration. However, no significant differences in the plasma chlorzoxazone concentration were found between the four anaesthetics. The estimated chlorzoxazone clearance increased after beginning inhalation with all four agents, but no significant difference in clearance was noted between agents.
Conclusions: At therapeutic concentrations, the in vivo inhibitory effect on chlorzoxazone metabolism was similar for all four inhalational anaesthetics examined, even though their chemical characteristics and extent of hepatic metabolism differ considerably.  相似文献   

17.
Abstract Immunoadsorption (1A) therapy with tryptophan (TR-350) or phenylalanine (PH-350) adsorbents has been used to reduce the concentration of serum antibodies in human lymphocyte antigen (HLA)-immunized patients. Other forms of plasma purification have been reported to reduce the level of fibrinogen, which affects the blood properties. In this study we investigated the effects of IA therapy using both adsorbents on plasma fibrinogen and immunoglobulins G and M in 13 patients (8 patients were treated with TR-350, and 5 patients were treated with PH-350). During each session 1 plasma volume (2.8 ± 0.4 L of plasma) was processed through the immunocolumn and then returned to the patient together with the blood cells. Compared with the pretreatment values, the plasma fibrinogen, IgG, and IgM concentrations were significantly reduced after IA therapy (p < 0.01 for TR-350; p < 0.04 for PH-350). There was a positive correlation between the degree of reduction of plasma proteins and the number of IA treatments given. A nonpara-metric test (Wilcoxon's signed-rank test or the Mann-Whitney test) was used for statistical analysis. We conclude from our study that IA therapy effectively lowers the plasma levels of fibrinogen, IgG, and IgM and thus can be considered a valuable alternative to other blood purification methods.  相似文献   

18.
Background: Obesity is increasing globallly, including in the formerly "Eastern Bloc" countries. Methods: A survey was made of obesity and bariatric surgery. Results: In the 8 East and Central European countries studied, with total population 300 million, roughly 43% of the population was overweight (BMI 25-30), 23% obese (BMI > 30), with about 15 million people morbidly obese (BMI > 40). From 0-10 morbidly obese individuals/100,000/year undergo bariatric surgery. Conclusion: Most countries were found to provide inadequate treatment for obesity.The majority of the morbidly obese are not treated effectively. However, health-care awareness of obesity and bariatric surgeons are slowly increasing.  相似文献   

19.
20.
Abstract: Photopheresis is a technique in which peripheral blood mononuclear cells, in the presence of a photoacti-vatable compound, are exposed extracorporeally to ultraviolet A light and reinfused, inducing a host autoregula-tory immune response. Experimental work and ongoing clinical studies are helping to define the role of this novel, safe, and non-toxic immunomodulating technology in the field of transplantation.  相似文献   

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