稳定表达可诱导型CKS2 shRNA的卵巢癌OVCAR3细胞系的建立与鉴定

目的建立稳定表达可诱导型CKS2 shRNA的卵巢癌OVCAR3细胞系并研究CKS2敲除对卵巢癌OVCAR3细胞增殖的影响。方法根据siRNA的原理设计2对靶向CKS2的shRNA序列,构建慢病毒表达质粒(p LVTHM/CKS2 shRNA重组质粒);先用p LV-t TR/KRAB-Red空载体制备慢病毒并感染OVCAR3细胞;在此基础上再用p LVTHM/CKS2 shRNA重组质粒制备慢病毒并感染上述OVCAR3细胞;对上述两次慢病毒感染的OVCAR3细胞,用强力霉素(DOX)处理72 h后,用real time PCR及Western blot检测CKS2 mRNA及蛋白的表达;用MTT法检测细胞增殖。结果构建靶向CKS2的shRNA慢病毒表达质粒,包装出慢病毒并感染OVCAR3细胞;建立稳定表达可诱导型CKS2 shRNA的OVCAR3细胞系,通过DOX诱导,可明显抑制该细胞系中CKS2在mRNA及蛋白水平的表达(P0.05,P0.01);CKS2敲除可明显抑制OVCAR3细胞的增殖。结论建立稳定表达可诱导型CKS2 shRNA的OVCAR3细胞系,DOX诱导的CKS2敲除可明显抑制OVCAR3细胞增殖。     

慢病毒介导的shRNA对A549细胞Pin1表达的干扰作用

目的构建Pin shRNA慢病毒载体,建立稳定抑制肽基脯氨酰顺反异构酶1(Pin1)表达的A549细胞系。方法根据查阅文献获得Pin1shRNA干扰靶点序列并插入pLenR-GPH载体,构建pLenR-GPH-Pin1shRNA慢病毒载体,随后转入人胚肾HEK293T细胞中,收集其上清进行病毒滴度测定,再行慢病毒的包装,将获得的慢病毒毒液感染A549细胞。通过实时定量PCR(qRT-PCR)及Western blot法检测Pin1在不同组的表达抑制情况。结果经限制性内切酶鉴定及测序分析,成功构建了pLenR-GPH-Pin1shRNA慢病毒载体质粒,包装并得到高滴度的病毒颗粒。通过qRT-PCR和Western blot法检测显示,与对照组相比,pLenR-GPH-Pin1shRNA慢病毒载体感染的A549细胞中Pin1的表达在mRNA和蛋白水平均有所下降。结论慢病毒介导的shRNA能够有效下调A549细胞中Pin 1的表达。     

靶向人STAT3基因的shRNA慢病毒载体的构建

目的:构建并鉴定靶向人转录因子STAT3基因的shRNA慢病毒载体.方法:设计合成针对人STAT3基因的shRNA序列,运用基因重组技术将其插入到含U6启动子及绿色荧光蛋白基因的慢病毒表达载体pSicoR中,构建shRNA重组质粒pSicoR-STAT3-shRNA.经双酶切及DNA测序鉴定后,利用转染试剂X-tremeGENE HP将第3代慢病毒载体共转染至HEK293细胞进行病毒包装.以阴性载体为对照,用RT-PCR和Western blot分别检测STAT3基因和蛋白表达水平.结果:双酶切及测序证实载体构建正确,在HEK293中成功包装出高滴度慢病毒颗粒,感染HEK293后STAT3基因表达和蛋白质表达水平均较对照组明显降低(P＜0.05).结论:成功构建了靶向人STAT3基因的shRNA慢病毒载体.     

ESRP1剪接变异体的克隆及其对乳腺癌MDA-MB-231细胞增殖的影响

目的克隆ESRP1剪接变异体并构建其慢病毒表达载体,研究其对乳腺癌细胞MDA-MB-231细胞增殖的影响。方法以OVCAR3细胞的c DNA为模板,PCR扩增ESRP1剪接变异体,将其连接到带有Myc标签的pCMV-Myc真核表达载体;再以该真核表达载体为模板,将含有Myc标签的ESRP1剪接变异体克隆到慢病毒表达载体p LVt TR/KRAB-Red上,从而构建带有Myc标签的ESRP1剪接变异体慢病毒表达载体;用该慢病毒表达载体转染293T细胞,包装慢病毒;用该慢病毒感染MDA-MB-231细胞,用MTT法检测该细胞增殖,用Western blot检测该细胞中PARP蛋白的表达。结果成功构建带有Myc标签的ESRP1剪接变异体慢病毒表达载体,并包装出慢病毒;用该慢病毒感染MDA-MB-231细胞后,与空载体对照组比较,ESRP1过表达能明显抑制MDA-MB-231细胞增殖(P0.05);ESRP1过表达能诱导PARP蛋白的剪切。结论成功构建带有Myc标签的ESRP1剪接变异体的慢病毒表达载体;ESRP1过表达能抑制MDA-MB-231细胞增殖,这可能与细胞死亡有关。     

CREB-shRNA对氧糖剥夺/复氧皮层神经元线粒体形态和凋亡的影响

目的:探讨沉默CREB基因对氧糖剥夺/复氧神经元线粒体形态及细胞凋亡的影响。方法:3条靶向CREB基因的shRNA片段插入慢病毒载体pLenti Lox3.7(PLL),与包装质粒psPAX2和pMD2.G共转染293T细胞包装病毒颗粒后感染原代皮层神经元,Western blot检测CREB蛋白的沉默情况;分别用Mito Tracker red、TUNEL和Western blot实验检测氧糖剥夺/复氧诱导CREB基因沉默后神经元的线粒体形态、细胞凋亡和Bcl-2、Bax的表达情况。结果:pLL-CREB-shRNA1为最有效的shRNA,其抑制皮层神经元CREB基因表达率高达80%。CREB基因沉默促进氧糖剥夺/复氧诱导的皮层神经元线粒体向点状、片段化形态改变,同时降低Bcl-2表达、促进Bax的表达并加重细胞凋亡(P0.05)。结论:CREB-shRNA重组慢病毒载体可特异性抑制神经元CREB基因的表达,CREB基因沉默加重氧糖剥夺/复氧诱导的皮层神经元线粒体形态改变,促进细胞凋亡。     

敲低 Aurora-A 抑制 HepG2人肝癌细胞增殖并促进其凋亡

目的探讨敲低Aurora-A对HepG2人肝癌细胞增殖和凋亡的影响。方法设计Aurora-A短发夹RNA(shRNA)片段,构建和包装Aurora-A shRNA慢病毒载体,转染HepG2细胞,实时定量PCR检测Aurora-A mRNA表达,Westernblot法检测Aurora-A蛋白及磷酸化水平,噻唑蓝(MTT)法检测细胞增殖,流式细胞术检测细胞凋亡。结果成功构建Aurora-A shRNA慢病毒载体,转染后的HepG2细胞Aurora-A蛋白磷酸化水平明显降低。敲低Aurora-A后,HepG2细胞增殖显著降低,细胞凋亡率显著增加。结论敲低Aurora-A的表达抑制HepG2细胞增殖并促进其凋亡。     

慢病毒载体抑制FOXM1对卵巢癌SKOV3细胞增殖的影响与分子机制

目的:研究靶向转录因子FOXM1 shRNA慢病毒载体抑制FOXM1表达对人卵巢癌SKOV3细胞增殖的影响及其分子机制。方法:应用感染复数(MOI)为20的靶向FOXM1shRNA慢病毒颗粒感染人卵巢癌SKOV3细胞,MTT比色法检测感染后SKOV3细胞的生长曲线;流式细胞术分析感染72 h后细胞周期变化;实时荧光定量PCR及Western blot法分别检测感染72 h后FOXM1、Cyclin D1、PLK1等基因mRNA及蛋白表达变化。结果:MOI为20的靶向FOXM1 shRNA慢病毒颗粒能显著抑制SKOV3细胞生长,并将细胞阻滞在G0/G1期而S期细胞减少(P<0.01);显著下调FOXM1、CyclinD1、PLK1等基因mRNA及蛋白表达。结论:抑制FOXM1表达对人卵巢癌SKOV3细胞具有显著的增殖抑制作用。其作用与下调Cyclin D1、PLK1等蛋白的表达将细胞阻滞在G0/G1期有关。     

慢病毒介导RNA干扰血管内皮生长因子基因增强K562细胞对STI571敏感性

目的： 探讨慢病毒载体介导RNA干扰（RNAi）抑制血管内皮生长因子（VEGF）基因表达对白血病细胞系K562增殖和凋亡的影响。 方法： 构建靶向VEGF基因的短发夹状RNA(shRNA)慢病毒载体,与慢病毒包装质粒通过脂质体转染至293T细胞,包装产生的病毒液感染K562细胞。采用实时荧光定量PCR、Western blotting、ELISA等方法检测RNAi对K562细胞VEGF mRNA和蛋白表达的影响;台盼蓝拒染法和MTT法分析转导VEGF-shRNA对K562细胞增殖的影响;流式细胞术检测经STI571(甲磺酸伊马替尼)作用后细胞凋亡变化情况。 结果： 构建VEGF基因shRNA慢病毒载体(pRNAT-shRNA),并成功将其导入K562细胞。与K562和K562-con（转导空载体）组细胞相比,转导pRNAT-shRNA的K562-shVEGF细胞VEGF mRNA和蛋白表达均显著下降;生长曲线提示K562-shVEGF细胞增殖速度减慢;在STI571作用下,K562-shVEGF细胞凋亡率较K562和K562 -con组细胞明显增高(P<0.05)。结论： 慢病毒载体介导的VEGF基因RNA干扰可有效抑制K562细胞增殖,并能够增强细胞对STI571的敏感性。     

大鼠硫酸软骨素蛋白多糖基因shRNA慢病毒载体的构建及干扰效率鉴定

背景：最近研究发现硫酸软骨素蛋白多糖(NG2)在中枢神经系统中参与多种生理病理功能,慢病毒载体可感染分裂期细胞或非分裂期的细胞,并能在细胞内高效稳定的表达。 目的：构建大鼠源性NG2基因shRNA慢病毒载体并检测其干扰效率。 方法：选择大鼠NG2基因RNA干扰的靶序列,合成Oligo DNA,退火形成双链DNA,与Hpa Ⅰ和Xho Ⅰ双酶切后的pFU-GW-RNAi载体连接产生pLV-NG2-RNAi,PCR筛选阳性克隆,测序鉴定。将重组载体与pHelper 1.0载体、pHelper 2.0载体通过lipofectamineTM 2000共转染293T细胞包装产生慢病毒LV-NG2-RNAi,收集病毒上清并浓缩。采用孔稀释滴度测定法计算病毒滴度。将LV-NG2-RNAi慢病毒感染C6细胞,于感染后96 h提取细胞总蛋白,采用Western blot检测NG2的表达。 结果与结论：经PCR和测序证实构建片段大小及DNA序列与目的序列一致,实验成功构建大鼠NG2基因shRNA慢病毒载体LV-NG2-RNAi。包装浓缩慢病毒的滴度为8×1011 TU/L。Western blot检测显示在感染复数为50时,感染LV-NG2-RNAi慢病毒的C6细胞较感染对照慢病毒及未感染细胞NG2的表达明显降低,干扰效率可达100%(P < 0.05)。结果证实了实验成功构建大鼠NG2基因shRNA慢病毒载体,且该载体能够在细胞水平有效沉默靶基因。     

靶向MAG基因shRNA慢病毒载体的构建及其对MAG基因表达的沉默

 目的：设计以MAG基因为靶点的短发夹状RNA（shRNA）,构建重组慢病毒载体并鉴定此RNA干扰体系对MAG基因表达的影响。方法：将3条靶向大鼠MAG基因的shRNA片段插入至慢病毒载体pWPI,与pCDNA3-MAG-FLAG质粒用Lipofectamine　2000共转染293T细胞,Western blotting法鉴定出最有效的shRNA。此重组质粒与pAX2和pMD2G经293T细胞包装后,产生的重组慢病毒感染少突胶质细胞,48 h后Western blotting法检测MAG蛋白的表达情况。结果：经双酶切后测序鉴定,构建了MAG shRNA慢病毒载体pWPI-MAG,鉴定出shRNA-2为最为有效的shRNA。重组慢病毒能明显抑制少突胶质细胞中MAG的表达。结论：慢病毒介导的shRNA干扰技术可特异性阻断MAG的表达,为进一步探讨MAG特异性shRNA治疗神经系统髓鞘损伤奠定了基础。     

Level of functioning of siblings and parents of probands of varying degrees of retardation

A further analysis of already published data supports the position that retardates of low ability level less frequently have retarded siblings, retarded parents, and parents low in occupational level than do retardates higher in ability level. The analysis supports the position that there are two types of retarded individuals, persons retarded as a result of gene or chromosomal anomalies, brain injury, etc., who more frequently occur in the lower-level retardate group, and persons whose retardation represents polygenic segregation, who more frequently occur in the higher-level group.     

局部注射辛伐他汀对骨质疏松大鼠股骨髁骨小梁的改建效应

背景：局部注射具有成骨作用的辛伐他汀,可显著增加骨质疏松大鼠股骨颈及股骨髁部的骨密度及力学强度,分析局部注射辛伐他汀对股骨髁骨小梁的影响。 目的：进一步研究骨质疏松大鼠股骨内局部注射辛伐他汀对股骨髁骨小梁的影响。为将辛伐他汀应用于临床骨质疏松局部治疗提供实验基础。 方法：18只雌性SD大鼠双侧卵巢切除后3个月,制备大鼠骨质疏松模型。实验大鼠随机数字表法均分为3组,分别在实验大鼠的右侧股骨髓腔内单次注射辛伐他汀溶液5 mg、10 mg,对照组单纯注射空白载体。分别在注射后1个月处死大鼠并取材。Micro-CT扫描并定量分析骨组织形态变化。 结果与结论：给药后1个月,Micro-CT扫描结果显示,辛伐他汀治疗组的骨微结构参数如骨皮质厚度、骨小梁密度及连接率明显优于对照组。说明疏松骨骼单次注射小剂量辛伐他汀可显著促进股骨髁部骨小梁改建,改善骨骼微结构,可为强化局部、防治骨质疏松骨折的新选择进一步提供实验基础。     

石斛属民族药用植物的分类及生药学研究

中药石斛早在《神农本草经》中就被列为上品,其应用历史悠久,具有养阴生津、补肾益气、润喉护嗓、活血明目、抗癌防老等功效。本文对国内外石斛属民族药用植物的分类及生药学研究进行了综述。     

膝关节骨性关节炎的关节镜治疗体会

目的我科自2001～2005年4月对59例67膝的骨性关节炎（0A），进行关节镜检查及镜下清理术。方法镜检：膝关节骨性关节炎伴不同程度滑膜炎，滑膜皱壁粘连纤维片，关节软骨不同程度破坏。镜下清除增生滑膜，松解粘连，去除剥脱软骨、修复关节面。结果随访2月～4年，平均1.5年，术后综合评估2月～1年，优良率94％；1～2年，优良率79.2％；2年以上优良率54.8％。结论关节镜对膝关节骨性关节炎诊断能提供了比较全面的资料，并对骨性关节炎早期有良好疗效，具有创伤小、恢复快、并发症少和重复治疗等优点。     

Anatomical study of distribution of valves of the cutaneous veins of adult''s limbs

Since the cutaneous veins of the four limbs have been used as autogenous grafts in the treatment of cardiovascular disorders, knowledge of distribution of the valves is increasingly required depending upon the use. In the gross anatomical study of distribution of valves of the trunci venae, there has been argument about locational relationships between the venous roots and the valves in the vicinity of the roots and the inter-valvular distance. However, there have been only few reports discussing detailed information about valves of the cutaneous veins of the four limbs. The authors observed patterns of distribution of the cutaneous venous valves of the four limbs of cadavers prepared for practice in anatomy. The following parts were excised from each cadaver: the cephalic, basilic, and the great saphenous veins, which originate from the acral venous network and flow into the proximal deep veins, and the venous roots communicating with these veins. An incision was made on each excised vein in the direction of the long axis under observation with a stereoscopic microscope, and the inter-valvular distance and the distance between the valve and the orifice of venous root in the vicinity of the valve were measured. The inter-valvular distance varied with type of the truncus venae, and it varied according to area even in the same truncus venae.     

Pathways of the realization of immunomodulating effects of neurotransmitters

Translated fromByulleten' Eksperimental'noi Biologii i Meditsiny, Vol. 115, N ^o 4, pp. 401–404, April, 1993     

Characterization of sterols of three digenetic trematodes of buffalo

Sterols of three digenetic trematodes were isolated and characterized by infrared and 1H nuclear magnetic resonance spectroscopies, and gas-liquid chromatography and gas chromatography-mass spectrometry. Sterols identified were cholesterol, cholestanol, 24-methylcholesterol, 24-methylcholestanol, 24-ethyl-22-dehydrocholesterol, 24-ethyl-22-dehydrocholestanol, 24-ethylcholesterol and 24-ethylcholestanol.     

Mechanisms of generation of slow components of bioelectric activity in diagnostics of functional state of the gastrointestinal tract

New electrophysiologic devices were used for the diagnostics of the state of excitable structures in the gastrointestinal tract and correction of their motor functions. Bioelectrical and biomechanical activities form the basis of functioning of internal organs. The mechanisms of generation of slow bioelectrical activity that are important for clinical and physiological studies are described. One of these mechanisms is a capacitance parametric transducer converting the energy of contractions into specific electric signals reflecting muscle functions. Another mechanism results from slow oscillations of resting potentials of interrelated excitable cells in large neuromuscular structures of internal organs. The elaborated procedure is efficient for preventing early postoperative paresis of the gastrointestinal tract. Translated fromByulleten' Eksperimental'noi Biologii i Meditsiny, Vol. 128, No. 10, pp. 448–452, October, 1999     

胃小弯侧血管弓的MDCT解剖

目的：研究正常胃小弯侧血管弓及其属支血管的多排螺旋CT表现。方法：回顾性分析51例正常成人的上腹部CT资料,观察胃小弯侧血管弓及其属支血管的显示情况、血管弓形态及其与胃壁的关系。结果：51例均显示胃小弯侧血管弓,血管弓贲门部属支、胃体部属支和幽门部属支分别显示46例、15例和10例;血管弓与胃壁紧邻41例。结论：MDCT检查可良好显示正常胃小弯侧血管弓及其属支血管。     

Assessment of the efficacy of treatment of hemangiomas

Assessment of the aftereffects of cryoexposure and ultrahigh-frequency cryoexposure on hemangioma tissue of various types, cavernous and squamous, showed a higher cryogenic effect in hemangiomatous tissue preexposed to ultrahigh-frequency waves. A quantitative criterion is proposed for assessing the efficacy of the studied methods of exposure. Translated fromByulleten' Eksperimental'noi Biologii i Meditsiny, Vol. 119, N ^o 6, pp. 669–672, June, 1995