葛根总黄酮诱导人早幼粒细胞白血病细胞株NB4细胞凋亡的实验研究

本研究探讨葛根有效成分对恶性白血病可能的凋亡诱导作用及其分子机制。采用葛根总黄酮(flavonoids of puerarin,PR)处理人早幼粒细胞白血病(APL)细胞株NB4,用MTT法检测细胞增殖抑制率;FITC-Annexin V/PI双染法检测细胞凋亡率;实时定量PCR检测pml/rarα、bcl-2、survivin基因表达;Western blot检测JNK、p38MAPK、FasL及caspase相关酶的变化。结果发现,PR能明显抑制NB4细胞增殖,并诱导细胞凋亡。随着PR浓度的增加,pml/rarα、bcl-2及survivin基因在mRNA水平表达下调,JNK、FasL、caspase3及caspase8蛋白表达增加,与PR浓度呈正相关;PR联合三氧化二砷(arsenic trioxide,ATO)处理后上述作用更为明显。结论:PR诱导NB4细胞凋亡的机制可能与JNK相关信号分子的活化有关;PR联合ATO具有协同诱导NB4细胞凋亡的作用。     

长春新碱对人成骨肉瘤MG63细胞的增殖抑制和凋亡促进作用及其机制

目的 观察长春新碱对人成骨肉瘤MG63细胞增殖的抑制及凋亡促进作用,探讨其作用的分子机制.方法 以0、5、10、20、50、100 μg·L-1不同浓度长春新碱处理的MG63细胞,分别经CCK-8及Hoechest 33342检测细胞增殖和细胞凋亡水平,用实时定量RT-PCR分析mRNA表达水平.结果 长春新碱可抑制MG63细胞增殖;长春新碱可以促进细胞凋亡;长春新碱可以下调c-myc及上调caspase9基因表达（P〈0.05）.结论 长春新碱从较低浓度起即有抑制细胞增殖及促进细胞凋亡作用,其作用机制是通过下调c-myc及上调caspase9的基因表达实现的.     

丙戊酸钠联合三氧化二砷诱导多发性骨髓瘤RPMI 8226细胞凋亡及其机制研究

本研究旨在探索丙戊酸钠联合三氧化二砷对多发性骨髓瘤RPMI8226细胞凋亡的影响及其相关机制.利用CCK-8法检测不同浓度的丙戊酸钠、三氧化二砷单药和两药联合应用对RPMI 8226细胞增殖的抑制作用.采用流式细胞术检测细胞凋亡情况.半定量RT-PCR和Western blot分别检测各组BCL-2、BAX、caspase-8及caspase-9的mRNA和蛋白表达水平的变化.结果表明：丙戊酸钠及三氧化二砷均可抑制RPMI 8226细胞增殖,两者联合应用有协同作用（Q值大于1.15）.联合用药组RPMI 8226细胞凋亡率较单药组明显增加（P＜0.05）.与丙戊酸钠或三氧化二砷单药组相比,联合用药组RPMI 8226细胞BCL-2 mRNA及蛋白表达水平下降,BAX、caspase-8及caspase-9mRNA及蛋白表达水平上调.结论：丙戊酸钠和三氧化二砷有协同抑制RPMI 8226细胞增殖和诱导凋亡的作用,这可能与BCL-2表达下调,BAX、caspase-8及caspase-9表达上调有关.     

大黄素对Jurkat细胞凋亡的诱导作用及其机制的初步研究

本研究探讨中药大黄素（emodin）对T淋巴细胞白血病Jurkat细胞株增殖、凋亡的影响及其作用机制。应用MTT法检测细胞增殖能力;DNA片段化检测和末端缺口原位标记（TUNEL）法分析细胞凋亡;蛋白印迹法（Western blot）检测BCL-2、C—MYC、hTERT、caspase蛋白前体procaspase-8、procaspase-9、procaspase-3和caspase-3剪切片段以及PARP等蛋白的表达水平。结果表明：大黄素能明显抑制Jurkat细胞增殖,对Jurkat细胞的半数抑制浓度（IC50）约为20μmol／L。DNA片段化的检出及TUNEL凋亡细胞的检出证实了大黄素能有效诱导Jurkat细胞凋亡,细胞凋亡率在一定的药物浓度范围内（0—80μmol／L）与药物作用浓度和作用时间呈正相关。Western blot检测结果显示,BCL-2、C—MYC和hTERT蛋白在大黄素作用后表达水平下降,caspase家族的蛋白前体procaspase-3、8、9表达均下降,而激活后的活性片段caspase-3则表达上调。结论：大黄素能有效抑制Jurkat细胞增殖,诱导其凋亡。其机制可能与下调BCL-2、C—MYC、hTERT等凋亡相关蛋白表达,激活caspase家族特别是caspase-3活性片段蛋白表达有关。     

lncRNA MEG3对肝癌细胞增殖凋亡的影响及机制研究

目的探讨lncRNA MEG3对肝癌细胞增殖凋亡的影响及机制。方法 RT-PCR检测人肝癌HepG2细胞转染48 h后MEG3的mRNA表达;CCK8实验检测细胞增殖;流式细胞仪检测细胞凋亡;Western blot检测ki67、PCNA、Cleaved caspase3、β-catenin、Cyclin D1蛋白表达。结果与pc DNA3.1组比较,pc DNA3.1-MEG3组MEG3的mRNA表达显著上升,pcDNA3.1-MEG3组细胞存活率显著降低,细胞凋亡率显著升高,Cleaved caspase3蛋白表达显著上调,ki67、PCNA、β-catenin、Cyclin D1蛋白表达显著下调(P0.01)。结论 lncRNA MEG3高表达可抑制肝癌细胞增殖,促进细胞凋亡,其机制与Wnt/β-catenin信号通路的调控有关。     

siRNA干扰JARID1B基因表达对HL-60细胞增殖和凋亡的影响

目的 研究siRNA干扰JARIDIB基因表达对急性早幼粒白血病细胞系HL-60细胞增殖、凋亡的影响,并探讨其可能的机制.方法 以LipofectamineTM 2000(Lipo)为载体将JARIDlB特异性siRNA转染至HL-60细胞,RT-PCR检测HL-60细胞JARID1 B mRNA的变化,Western blot检测JARIDIB蛋白及组蛋白H3K4甲基化的变化;MTT法观察细胞增殖,流式细胞术检测细胞凋亡;用Western blot分析凋亡相关蛋白Bcl-2、proeaspase-9、procaspase-3、c-myc及P27的变化.结果 干扰JARIDI B基因表达可上调白血病细胞组蛋白H3K4甲基化水平;siRNA干扰JARIDIB基因可抑制HL-60细胞增殖,诱导细胞凋亡;0、30、60、120 nmo/L JARII)iB siRNA处理24 h后,凋亡细胞百分率分别为(11.0±3.6)%、(35.2±5.1)%、(52.7±3.8)%、(62.0士5.7)%,差异有统计学意义(F=70.27,P<0.01);转染后细胞Bcl-2、procaspase-9、procaspase-3、c-myc蛋白表达下降,而P27蛋白表达七升.结论 JARIDI B siRNA可上调组蛋白H3K4甲基化,可有效抑制肿瘤细胞增殖并诱导肿瘤细胞凋亡,其可能通过上调P27蛋白、下调Bcl-2、procaspase-9、procaspase-3、c-myc蛋白表达发挥诱导凋亡作用,有望成为白血病基因治疗的新靶点.     

脑脉通联合溶栓对血栓栓塞性脑缺血大鼠神经细胞凋亡的影响

目的比较脑脉通联合不同时间窗溶栓治疗对脑缺血大鼠神经细胞凋亡的阻抑作用及其对相关调控基因的影响。方法大鼠随机分为假手术组、模型组、尿激酶溶栓组(简称溶栓组)、脑脉通组、脑脉通 尿激酶溶栓组(简称联合组)。自体血栓结合线栓阻塞大鼠大脑中动脉制备血栓栓塞性脑缺血动物模型。大鼠分别于缺血后3、6、9 h经导管由区域动脉进行溶栓。动脉给药后24 h,观察大鼠脑组织神经细胞凋亡变化；测定细胞凋亡相关基因蛋白bax、caspase-3和bcl-2表达变化。结果各模型组大鼠TUNEL阳性细胞均较假手术组增多、bax和caspase-3表达增强、bcl-2表达下调；与模型组比较,各用药组大鼠TUNEL阳性细胞数减少,溶栓组、联合组各时间点bax和caspase-3表达减弱、bcl-2表达上调；各组6 h和9 h较其3 h TUNEL阳性细胞数增加、bax和caspase-3表达增强、bcl-2表达下调；除脑脉通组外各组9 h较6 h组TUNEL阳性细胞数增多、bax和caspase-3表达增强,bcl-2减弱；联合组较单一用药组TUNEL阳性细胞数减少、6 h和9 h组bax及caspase-3表达减弱、bcl-2增强。结论脑缺血损伤可引起促凋亡基因表达上调和抑凋亡基因表达下调,神经细胞凋亡发生,该变化随缺血时间延长而显著；脑脉通及溶栓治疗均可阻抑脑缺血神经细胞凋亡,但以二者联合用药的效果尤为理想,通过下调促凋亡基因bax和caspase-3表达、上调抑凋亡基因bcl-2的表达对神经细胞凋亡发挥阻抑作用。     

胰岛素联合顺铂对人宫颈癌细胞株HeLa生长的影响

目的：观察胰岛素（INS）联合顺铂（DDP）对人宫颈癌 HeLa 细胞生长及凋亡的影响,并初步探讨其作用机制。方法体外培养的人宫颈癌细胞株（HeLa）经INS、DDP单独或联合作用后,MTT检测细胞增殖抑制情况;Annexin V-FITC双染流式细胞术分析细胞凋亡;流式细胞仪检测不同加药处理组的细胞周期时相变化情况;Western blot 印迹方法检测细胞中 JNK2、p-JNK2及caspase-3蛋白的表达情况。结果 MTT结果显示：INS无抑制细胞增殖作用,DDP单药组与联合用药组均能抑制细胞的增殖,两药联合时细胞增殖抑制率明显高于DDP单药组,差异有统计学意义（P=0.000）,细胞凋亡结果显示：INS无促细胞凋亡的作用,联合用药组的细胞凋亡率明显高于DDP单药组（P〈0.01）。细胞周期结果显示：DDP、INS单药均能促进细胞由G1期向S期转变;联合用药组HeLa细胞S期比例增加更加明显,与DDP组相比,差异有统计学意义（P〈0.05）。Western blot 结果显示：实验组与对照组比较,JNK2蛋白水平无明显变化, p-JNK2、caspase-3于DDP组及 DDP＋INS 组中表达增加,联合用药时增加更为明显,与DDP组相比,差异有统计学意义（P〈0.05）,而在INS组中三种蛋白表达变化均不明显。结论 INS 可增强DDP对宫颈癌HeLa细胞的毒性作用,其机制可能与协同DDP促进细胞由G0期步入S期,上调p-JNK2及 caspase-3蛋白表达有关。     

Evn一50增强人卵巢癌顺铂耐药株COCl／DDP对顺铂敏感性的研究

目的 观察黄荆子乙酸乙酯提取物（Evn-50）和顺铂（DDP）在体外对人卵巢癌耐顺铂细胞株COC1/DDP凋亡的影响,探讨Evn-50提高人卵巢癌耐顺铂细胞株COC1/DDP对DDP敏感性的机制.方法 运用MTT、FCM、Hoechst33258染色法、Western blot等方法,观察Evn-50增强DDP抑制COC1/DDP细胞增殖作用和此过程中COC1/DDP细胞凋亡,caspase-3蛋白、增殖细胞核抗原（PCNA）及其泛素化修饰蛋白（Ubi-PCNA）表达的改变.结果 Evn-50不仅增强DDP对COC1/DDP细胞的抑制增殖作用,也增强DDP对COC1/DDP细胞的凋亡作用,同时caspase-3蛋白表达增加（P〈0.05）;而Evn-50（20 μg/ml）组与空白对照组相比PCNA蛋白表达下调（P〈0.05）,Evn-50与DDP合用组与DDP单药组均出现了Ubi-PCNA蛋白表达,Evn-50与DDP合用组与DDP组比较,Ubi-PCNA蛋白表达下调（P〈0.05）.结论 Evn-50可能通过减少PCNA表达,使DDP诱导的PCNA泛素化水平下降,从而逆转DDP耐药,最终通过激活caspase-3蛋白高表达,启动caspase级联反应,增强DDP对人卵巢癌DDP耐药细胞株COC1/DDP的凋亡作用.     

茶多酚对前列腺癌PC-3M细胞增殖与凋亡的影响

目的探讨茶多酚对前列腺癌PC-3M细胞增殖及凋亡的影响。方法设立对照组与实验组,采用MTT比色法检测TP对PC-3M细胞增殖的影响;吖啶橙/溴化乙锭染色法观察诱导细胞凋亡情况;流式细胞术分析细胞周期;RT-PCR和Western blot检测Caspase-3基因的转录与表达。结果与对照组比较,MTT法示实验组对PC-3M细胞的增殖抑制作用增强;细胞染色法示实验组凋亡率增高;流式细胞术显示细胞阻滞于G1期,增殖指数降低;RT-PCR与Western blot示Caspase-3基因转录与翻译上调,上述结果在一定范围内呈时间、剂量依赖性(P0.05)。结论茶多酚对人前列腺癌PC-3M细胞具有增殖抑制、促进凋亡作用,与上调caspase-3基因的转录与表达有关。     

微管相关蛋白1轻链3在新生期大鼠惊厥后海马的表达

Objective To explore the repetitive expressions of autophagy marker protein-rnicrotubule-associ-ated protein 1 light chain 3 (LC3) in hippocampus in newborn rats with recurrent seizure and the influence of 3-methyladeine (3-MA) on LC2 expressions. Method Seventy-two 6-day-old SD rats were randomly (random nam-ber) divided into the recurrent neonatal seizure group (RS group, n = 24), the 3-MA-treated seizure group (3-MA group, n = 24) and control group (n = 24). Rats in RS group were subjected to 55 attacks of seizure induced by flurothyl in 9 successive days from the 6th postnatal day (P6). In 3-MA group, 2 μL of 3-MA was injected every day till seizure induced. Western blot analysis was used to determine LC3 protein level in hippocampus at different intervals of 1.5 h,3 h,6 h and 24 h after the last convulsion. The LC3 protein level was analyzed with Dunnett test after ANOVA. Results LC3 protein levels in RS group at the different intervals were significantly higher than those in the control group and in 3-MA group (F =4.70,5.28,8.51 and 5.89, respectively, P <0.05), and there were no significant differences in LC3 protein level between 3-MA group and control group at those intervals (P > 0.05). Conclusions The autophagy/lysosomal pathway is immediately activated after recurrent seizure evidenced by the elevated expressions of LC3 in hippocampus. The 3-MA is involved in the regulation of autophagy/ lysosomal pathway by down-regulating the expressions of LC3.     

微管相关蛋白1轻链3在新生期大鼠惊厥后海马的表达

Objective To explore the repetitive expressions of autophagy marker protein-rnicrotubule-associ-ated protein 1 light chain 3 (LC3) in hippocampus in newborn rats with recurrent seizure and the influence of 3-methyladeine (3-MA) on LC2 expressions. Method Seventy-two 6-day-old SD rats were randomly (random nam-ber) divided into the recurrent neonatal seizure group (RS group, n = 24), the 3-MA-treated seizure group (3-MA group, n = 24) and control group (n = 24). Rats in RS group were subjected to 55 attacks of seizure induced by flurothyl in 9 successive days from the 6th postnatal day (P6). In 3-MA group, 2 μL of 3-MA was injected every day till seizure induced. Western blot analysis was used to determine LC3 protein level in hippocampus at different intervals of 1.5 h,3 h,6 h and 24 h after the last convulsion. The LC3 protein level was analyzed with Dunnett test after ANOVA. Results LC3 protein levels in RS group at the different intervals were significantly higher than those in the control group and in 3-MA group (F =4.70,5.28,8.51 and 5.89, respectively, P <0.05), and there were no significant differences in LC3 protein level between 3-MA group and control group at those intervals (P > 0.05). Conclusions The autophagy/lysosomal pathway is immediately activated after recurrent seizure evidenced by the elevated expressions of LC3 in hippocampus. The 3-MA is involved in the regulation of autophagy/ lysosomal pathway by down-regulating the expressions of LC3.     

容积重建成像3D-CTA与3D-DSA在诊断急性破裂性颅内微小动脉瘤的研究

目的 对比研究容积重建成像三维CT血管造影与三维DSA(3D-DSA)在颅内微小动脉瘤诊疗中的临床应用价值.方法 对广东省人民医院2007年5月至2008年11月收治的174例蛛网膜下腔出血患者首先采用采用GE公司的Light Speed Plus 64排容积螺旋CT机获得原始图像,采用容积重建成像技术(VR)进行三维重建.并辅助运用多轴面重建(MPR),然后再行全脑血管造影术,并行3D-DSA成像.结果 本组174例蛛网膜下腔出血患者诊断为颅内微小动脉瘤11例,均经开颅手术证实;其中CTA诊断11例,3D-DSA诊断10例.容积重建成像CTA清晰显示颅内微小动脉瘤、载瘤动脉、动脉瘤的形状和大小及其与邻近结构的解剖关系,与3D-DSA差异无统计学意义.结论 容积重建成像CTA是一种可靠、无创的快速诊断颅内微小动脉瘤的方法,为急症手术提供了详实的影像学资料,可帮助制定治疗方案.     

CXCR3和CCR3在T细胞非霍奇金淋巴瘤中的表达及意义

目的:检测T细胞非霍奇金淋巴瘤(T-NHL)中CXC型趋化因子受体3(CXCR3)、CC型趋化因子受体3(CCR3)的表达水平,分析其在T-NHL中的表达意义,探讨T-NHL的分类.方法:采用SP免疫组织化学方法检测45例T-NHL中CXCR3和CCR3的表达,利用?字2检验分析两者的表达差异及其与临床病理特征的相关性.结果:CXCR3和CCR3总表达率为24.4%;不同病理类型之间的表达差异无显著性(P ＞ 0.05);CXCR3和CCR3总表达与肿瘤患者的性别、年龄、肿瘤部位以及恶性程度无相关性.结论:根据肿瘤细胞是否表达CXCR3或CCR3来进一步分类T-NHL,还需进一步的实验验证.     

N-甲基天冬氨酸受体拮抗剂AP-5在海马对兔P3波电位的作用

目的推测Ｎ甲基天冬氨酸受体（ＮｍｅｔｈｙｌＤａｓｐａｒａｔｅｒｅｃｅｐｔｏｒ,ＮＭＤＡＲ）的兴奋性突触后电位（ｅｘｃｉｔａｔｏｒｙｐｏｓｔｓｙｎａｐｔｉｃｐｏｔｅｎｔｉａｌｓ,ＥＰＳＰ）活动对兔Ｐ３波的作用。方法采用ＮＭＤＡＲ竞争性拮抗剂ＡＰ５（３．１２５、６．２５、１２．５ｍｍｏｌ／Ｌ）在海马ＣＡ１、ＣＡ３微量注入,观察Ｐ３波电位变化。结果ＡＰ５在ＣＡ１区呈一定量效依赖延长Ｐ３ａ波潜伏期,在ＣＡ１、ＣＡ３为明显量效依赖延长Ｐ３ｂ波潜伏期,ＡＰ５对Ｐ３ａ、Ｐ３ｂ波电压振幅无明显影响。结论ＣＡ１区ＮＭＤＡＲＥＰＳＰ活动是Ｐ３ａ波发生相关神经元兴奋的易化因素,可能是海马实施对Ｐ３ａ波潜伏期调节的重要机制。ＣＡ１、ＣＡ３区ＮＭＤＡＲＥＰＳＰ可能共同对Ｐ３ｂ波发生相关神经元兴奋起易化作用,故可影响其潜伏期。     

日本血吸虫信号蛋白14-3-3在虫卵的定位及其免疫诊断价值初探

目的探讨日本血吸虫信号蛋白14—3—3（sj14—3—3）在虫卵内的定位和重组Sj14—3-3（rsj14—3—3）的免疫诊断价值。方法从日本血吸虫尾蚴感染42d的兔肝脏中分离虫卵,用逆转录聚合酶链反应（1it—PCR）检测sj14．3．3基因在虫卵期的转录水平;兔肝组织石蜡切片免疫组化染色,观察内源性Sj14—3—3在虫卵内的分布和表达丰度。利用纯化的rSj14-3-3和可溶性虫卵抗原（SEA）,采用间接酶联免疫吸附试验（ELISA）检测急、慢性血吸虫病患者和正常人血清。结果RT-PCR从日本血吸虫成熟虫卵中检出760bp左右的基因片断;免疫组化显示Sj14-3-3主要分布在虫卵内毛蚴的体壁和两边的侧腺。检测急性、慢性患者和正常人血清抗rSj14-3—3抗原的抗体阳性率分别为91．0％、78．9％、0．0％;上述标本中抗SEA抗体的阳性率分别为97．4％、88．9％和2．5％。结论用ELISA检测抗SEA抗体和rSj14-3-3抗体诊断血吸虫病具有高度的特异性和敏感性,而Sj14—3-3在成熟虫卵阶段高表达,可能是SEA的主要组分,具有实用价值。     

Geometry corrections in a rotating 3-dimensional sonographic system.

OBJECTIVE: To devise a system for geometry corrections in a rotating 3-dimensional sonographic system. METHODS: A 3-dimensional sonographic imaging system based on a standard sonography machine was developed. The transducer mounted in a specially designed holder was rotated about its axis to acquire the spatial information. The most important postulate in rotating 3-dimensional systems is the assumption of parallelity between the rotation axis and the transducer axis. It allows the use of simple geometric relationships between 2-dimensional slices in a 3-dimensional reconstruction. The errors appearing in the 3-dimensional reconstruction when the axes are not parallel were investigated. RESULTS: A simple correction method based on phantom measurements is proposed. The phantom contains a plane, which is inclined to the rotation axis. The analysis of 2-dimensional plane images allows the geometric corrections. The construction of the phantom is described, and the formulas used in the calculations are presented. The method was tested in computer simulations and in patient investigations. CONCLUSIONS: A complete method of the geometric investigations and corrections useful in 3-dimensional sonographic systems based on rotational geometry is proposed. Both the computer simulations and the phantom measurements confirmed the usefulness, precision, and simplicity of the proposed method.     

Optimal growth of human blood hematopoietic progenitor cells collected by apheresis for autografts

For safe autografts with peripheral blood hematopoietic cells (PBSCT), better methods for determining the kinetics of stem cell populations and predicting engraftment speed after PBSCT need to be established. Current methods include culture in semi-solid medium and measurement of CD34 cell surface antigen. In this study with only partially purified blood cells obtained from children with cancer in remission, we compared the effects of phytohemagglutinin-stimulated lymphocyte-conditioned medium (PHA-LCM) and recombinant human cytokines on the growth of progenitor cells in a methylcellulose culture system. Interleukin-3 (IL-3) alone supported more progenitor growth than standard PHA-LCM by a factor of 1.54 for colony-forming unit granulocyte/macrophages (CFU-GM) and by a factor of 1.84 for burst-forming unit/erythroids (BFU-E). No significant change, in terms of the number of growing colonies, was observed by adding granulocyte/macrophage colony-stimulating factor (GM-CSF), granulocyte-CSF (G-CSF), or IL-1 to IL-3. However, the addition of G-CSF resulted in increased colony size. A further increase in CFU-GM growth was observed by the addition of IFN-γ to the combination of cytokines. No significant effect was observed when stem cell factor (SCF) was added to the combination of cytokines containing IL-3, G-CSF, and IFN-γ. This analysis suggests that the combination of IL-3, G-CSF, and IFN-γ may provide sufficient stimulation for the growth of human blood cells. The effects of different oxygen tensions on progenitor growth in the presence of IL-3, G-CSF, and IFN-γ were also evaluated. Both CFU-GM and BFU-E formation were increased when the culture was grown at 5% O₂, as compared with an ambient 20% O₂ tension. A small number of infused cells were grown in culture incorporating either IL-3, G-CSF, and IFN-γ at 5% O₂ or PHA-LCM at 20% O₂, and the number of infused cells was correlated to the speed of hematopoietic recovery after PBSCT. Although a significant negative correlation was observed between the number of infused CFU-GM per kilogram of the patient's body weight and the recovery of hematopoiesis under both culture conditions, a better correlation was found when the former method was applied (P lt; .001 vs. P lt; .05). These findings suggest that a culture containing IL-3. G-CSF, and IFN-γ at low O₂ tension provides satisfactory conditions for the proliferation of blood progenitors, and that this mixture of recombinant cytokines may enable a standardized hematopoietic progenitor assay for PBSCT.     

FLT3靶向短发夹状干扰RNA体外转录合成及作用

FMS样酪氨酸激酶3（FLT3）是一种酪氨酸激酶受体,在大多数急性髓系白血病（AML）患者中持续激活,与患者预后差密切相关。为探讨3种FLT3靶向短发夹状干扰RNA（shRNA）对急性髓系白血病细胞株THP-1的沉默效应,设计和体外转录合成3个FLT3靶向shRNA（shRNA1、shRNA2、shRNA3）,体外转染THP-1细胞;以RT-PCR法检测FLT3mRNA水平表达,用流式细胞术、免疫荧光测定法检测FLT3蛋白的表达。结果显示：shRNA1、shRNA3可显著下调FLT3mRNA的表达,其中shRNA1的抑制作用较强。25nmol/LshRNA1转染48小时对FLT3mRNA的抑制率是（72.95±2.07）%,作用可达72小时。5nmol/L及以上浓度的shRNA1对FLT3mRNA表达有下调作用,作用存在量-效关系。15nmol/LshRNA1的抑制率是（67.53±0.66）%。FLT3蛋白位于细胞膜上,shRNA1对其有较强的抑制作用,转染72小时蛋白抑制率达（79.67±0.66）%。结论：FLT3-shRNA1具有较好的FLT3基因靶向抑制作用,可作为进一步研究该基因作用机制及靶向治疗可能性的工具。     

水胶体敷料联合3 M透明敷贴治疗压疮的效果观察

目的 探讨水胶体敷料联合3 M透明敷贴治疗压疮的效果.方法 将46例Ⅱ期、Ⅲ期压疮患者按科室划分分为观察组24例和对照组22例,观察组用水胶体敷料联合3 M透明敷贴治疗压疮,对照组用碘伏消毒加红外线照射治疗压疮.结果 观察组疗效优于对照组,两组治疗效果比较,x2=13.85,P<0.01.结论应用水胶体敷料联合3 M透...