靶向性启动子携带报告基因NIS介导提高胶质瘤摄碘能力

目的 在细胞实验中探讨靶向性人端粒酶逆转录酶(hTERT)启动子携带人类钠碘转运体(hNIS)基因能否提高胶质瘤的摄碘能力.方法 检测在hTERT启动子引导下表达hNIS基因的腺病毒,使用该腺病毒转染U87和U251细胞系,然后使用Υ记数仪检测转染后细胞的摄碘能力.结果 实验组肿瘤细胞在转染Ad-hTERT-hNIS后...     

小鼠FasL全长cDNA的克隆与FasL腺病毒载体的构建

目的: 克隆小鼠FasL全长cDNA, 构建FasL腺病毒载体。方法: 从经ConA(5mg/L)刺激 48h的BALB/c小鼠脾脏单个核细胞中克隆FasL全长cDNA, 构建以CMV启动子转录调控的含小鼠FasL全长cDNA的穿梭质粒mFasL pAdTrack。经PacI酶切后, 与腺病毒骨架质粒pAdEasy 1在大肠杆菌BJ5183中进行同源重组。挑选阳性重组子转染HEK- 293细胞, 构建CMV启动子转录调控的mFasL重组腺病毒载体。结果: 成功地克隆小鼠FasL全长cDNA, 经PCR、酶切及荧光检测等证实, 成功地构建了重组mFasL腺病毒载体。结论: 重组FasL腺病毒载体的构建为进一步研究FasL在肿瘤和自身免疫性疾病的作用奠定了基础。     

人端粒酶逆转录酶核心启动子调控的人TRAIL蛋白在人卵巢癌细胞中的表达

目的：构建人端粒酶逆转录酶基因核心启动子（hTERT）调控的肿瘤坏死因子相关凋亡诱导配体真核表达载体，并检测TRAIL在转染的卵巢癌细胞SKOV3中的表达情况。方法：利用基因重组方法将TRAIL基因克隆人带有hTERT基因核心启动子pIRES2-EGFP真核表达载体中。获得由hTERT基因核心启动子调控的绿色荧光蛋白和带有效应型TRAIL基因的真核表达载体hTERTpromoter-pIRES2-EGFP-TRAIL。采用脂质体介导的方法将hTERT调控的TRAIL基因真核表达载体转染人卵巢癌SKOV3细胞，采用G418筛选获得阳性克隆；应用免疫细胞化学法、蛋白质印迹分析、流式细胞术（FCM）结合间接免疫荧光、RT—PCR法检测转染前后卵巢癌细胞中外源基因的表达。结果：经酶切鉴定及测序结果证实所构建载体正确。转染细胞中的TRAIL表达明显高于对照组细胞。结论：成功地构建了hTRET基因核心启动子调控的TRAIL基因真核表达载体，并在人卵巢癌细胞系SKOV3中得到稳定表达，为进一步研究其对卵巢癌细胞生物学行为的影响奠定了实验基础。     

P53对涎腺腺样囊性癌细胞端粒酶活性的抑制作用

目的为了探讨P53基因对腺样囊性癌细胞端粒酶活性的抑制作用及机制。方法构建携带人野生型P53基因的腺病毒表达载体，以脂质体法瞬时转染腺样囊性癌SACC-83细胞，RT-PCR检测转染细胞P53基因mRNA的表达，TRAP-PCR-ELISA法检测转染细胞端粒酶活性的改变。并将P53基因与含有hTERT启动子核心调控区的荧光素酶报告基因pGL2—630共转染SACC-83细胞，测定转染细胞荧光素酶报告基因活性。结果1．瞬时转染含人野生型P53基因的重组腺病毒表达载体p△E1-P53于腺样囊性癌SACC-83细胞后，其P53基因mRNA的表达明显增强；2．基因转染后，SACC-83细胞内源性端粒酶活性显著降低。3．P53基因与含有hTERT启动子核心调控区的荧光素酶报告基因pGL2-630共转染SACC-83细胞后，其荧光素酶活性显著下降。结论外源性表达P53基因可以降低腺样囊性癌细胞SACC-83细胞端粒酶活性，并可能通过抑制端粒酶hTERT基因启动子的转录活性实现。     

人B7H4启动子荧光素酶报告基因载体的构建及活性分析

为构建人B7H4基因启动子荧光素酶报告基因载体,以人外周血单个核细胞基因组DNA为模板,PCR扩增3条不同长度人B7H4启动子序列,并插入PGL3-Basic荧光素酶报告基因载体中;待测序验证后,将3个重组质粒及pRL-TK内参质粒分别共转染HEK-293T细胞,采用双荧光素酶报告基因系统检测其启动子活性。测序结果显示构建的3个人B7H4基因启动子重组载体序列正确;重组载体转染HEK-293T细胞,经双荧光素酶报告基因检测确定重组载体有启动子活性,其中PGL3-hB7H4-0.5kb重组载体的转录活性较高。本研究成功构建了3条含不同长度的B7H4启动子序列的荧光素酶报告基因系统,为后续分析人B7H4启动子的转录调控元件及肿瘤微环境中调控B7H4表达的作用因素等研究奠定了实验基础。     

人端粒酶反转录酶启动子调控的肿瘤特异性载体的构建及表达

 目的: 构建由人端粒酶反转录酶(hTERT)启动子调控的具有肿瘤细胞特异性表达能力的荧光蛋白质粒。方法: 利用PCR技术克隆hTERT 基因启动子,利用分子生物学方法以该启动子替换pEGFP-C3质粒的CMV启动子,构建重组质粒（hTERTp-EGFP）。用脂质体转染法将hTERTp-EGFP质粒分别转染至肿瘤细胞和正常细胞, 观察此两种细胞内绿色荧光蛋白的表达差异。结果: 成功构建重组质粒hTERTp-EGFP,转染结果显示该质粒在肿瘤细胞中表达,而在正常细胞中无明显表达。结论: 重组质粒hTERTp-EGFP具有肿瘤特异性表达能力。     

一种新型炎症诱导型腺病毒表达系统的功能研究

目的 构建一种新型炎症诱导型重组腺病毒载体用于生理调控型基因治疗。方法 构建携带IL-1β增强子（-3690／-2720）／IL-6启动子（-590／＋2）重组体（IL1／IL6）的荧光素酶报告质粒和重组腺病毒载体，体外转染HepG2和RAW264．7细胞，观察各种细胞外刺激对IL1／IL6启动子活性调控的变化，并以动物实验观察炎症因子能否在体内通过调控IL1／IL6的启动活性而控制目的基因的表达。结果经荧光素酶分析显示IL1／IL6的本底启动活性较低，可经多种细胞外刺激而诱导活化，且具有较广泛的活性诱导范围；在体内，它可随炎症反应程度的变化而自主地调控外源基因的表达。结论携带IL1／IL6重组体启动子的重组腺病毒载体可作为生理反应调控型基因治疗载体用于全身性炎症、自身免疫性疾病等的治疗与研究。     

雌激素受体2对前列腺癌细胞系PC-3M增殖的影响

目的： 构建带有人雌激素受体2（ESR2）全长cDNA的重组质粒pcDNA3.1-hERβ,转染人前列腺癌PC-3M细胞株,观察ESR2对细胞增殖能力的影响。 方法：RT-PCR方法从人正常卵巢组织中获取ESR2全长cDNA,利用基因重组技术与真核表达载体pcDNA3.1连接,构建重组质粒pcDNA3.1-hERβ;瞬时转染前列腺癌PC-3M细胞株,应用细胞计数、MTT法及流式细胞术检测细胞增殖能力的改变;半定量RT-PCR法及Western blotting法分别检测增殖相关基因cyclinD1和 P21Cip1 mRNA及蛋白表达。 结果：DNA测序结果显示扩增的ESR2序列与GenBank（NM_001437）所公布的序列完全一致。重组质粒pcDNA3.1-hERβ瞬时转染人PC-3M细胞48 h后,与质粒对照组相比：RT-PCR法及Western blotting法显示,ESR2基因在mRNA水平和蛋白水平的表达均明显增加;细胞计数及MTT结果发现,细胞数目减少,细胞增殖活性下降（P<0.01）;流式细胞实验显示,G0/G1期细胞比例增加（P<0.05）,S期及G2/M期细胞比例减少（P<0.05）;RT-PCR及Western blotting结果还发现cyclinD1的表达减弱,而P21Cip1的表达增强。 结论：成功构建pcDNA3.1-hERβ重组质粒;带有ESR2全长基因的重组质粒转染PC-3M细胞后,细胞的增殖活性受到抑制;RSR2可能通过影响细胞增殖相关基因cyclinD1和 P21Cip1的表达抑制细胞的增殖。     

Topical organization of the projections of neurons of the substantia nigra and the ventral field of the tegmentum of the midbrain to the head of the caudate nucleus of the cat

Neuroscience and Behavioral Physiology -     

Asymmetry of the internal connections of the striate cortex of the cat in the projection zone of the center of the field of vision

Studies were carried out on the organization of the internal connections of the striate cortex in cats in the projection zone of the center (0–5°) of the field of vision by microintophoretic application of horseradish peroxidase to electrophysiologically identified orientational columns. The area containing neurons showing retrograde labeling in most cases extended in the mediolateral direction. Labeled cells were located in the upper (II, III) and lower (V, VI) layers of the cortex, and the shapes and orientations of the areas containing labeled neurons in these layers coincided. Spatial asymmetry was detected in the distribution of labeled neurons relative to the orientational column studied. Labeled cells were located predominantly medial to the columns, regardless of the distance from the projection of the area centralis. Considering the visuotopical map of field 17, the asymmetry detected here provides evidence that neurons in orientational columns have more extensive connections with neurons of the peripheral part of the cortex. An asymmetrical distribution of “silent” zones around the receptive fields of neurons in orientational columns is suggested, and that these appear to receive influences from the periphery of the visual field. Laboratory of Visual Physiology and Laboratory of Central Nervous System Morphology, I. P. Pavlov Institute of Physiology, Russian Academy of Sciences, 6 Makarov Bank, 199034 St. Petersburg, Russia. Translated from Fiziologicheskii Zhurnal imeni I. M. Sechenova, Vol. 82, No. 12, pp. 23–29, December, 1996.     

Characteristics of the topographic interrelation of the head of the pancreas and the duodenum and pathology of the organs of the pancreatoduodenal area

Seventy pancreatoduodenal complexes of 55 patients with chronic pancreatitis and tumours of this zone and 15 patients died from other diseases are studies histotopographically . The pieces of the pancreatic head tissue in the medial wall of the duodenum were found in 12 cases of the first group and in 4 control cases. The pancreatic tissue consisted either of all elements of this organ or cystically dilated ducts and seemed to infiltrate different layers of the duodenum wall. Three variants of the pancreatic head structure are suggested on the basis of anatomo-topographical interrelationships of the pancreatic head and duodenum. In 12 out of 14 cases chronic pancreatitis and carcinoma of organs of this zone were combined with the variants of the pancreatic head structure, in 2 cases there was a true heterotopy . Pathogenetic significance of these variants for the development of chronic pancreatitis is discussed.     

Influence of the level of the transmembrane potential on the dynamics of the extinction of the amplitude of the synaptic reactions of the snail under voltage clamping conditions

The influence of the level of the transmembrane potential on the dynamics of the extinction of the amplitudes of summary excitatory postsynaptic currents arising in identified giant parietal neurons in response to rhythmic stimulation of the intestinal nerve was investigated in a preparation of the isolated CNS of the common snail in order to identify the possibility of the participation of the postsynaptic element in synaptic plasticity. It was demonstrated that, at a greater value of the transmembrane potential, the decrease in the amplitudes of the postsynaptic currents which have been induced by rhythmic stimulation takes place more rapidly. It was also demonstrated that at a higher frequency of stimulation of the nerve, the effect of the influence of the membrane potential level on the dynamics of the synaptic reactions is more prominent. The data obtained may be regarded as an argument in favor of the possibility of the participation of the post-synapse in plasticity. This study was partially supported by the Russian Basic Research Fund (project No. 94-04-12209). Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow. Translated from Zhurnal Vysshei Nervnoi Deyatel'nosti imeni I. P. Pavlova, Vol. 45, No. 1, pp. 171–179, January–February, 1995.     

Effects of the lesion of the postcommissural part of the septum on the behavior of the rat.

The effects of the lesion of the postcommissural part of the septum on behavior of the rat has been studied. Results may be summarized as follows. An increase in the exploratory behavior in the open field which decreases rapidly; a decrease in the number of defecations in this test and a decrease in time leaving a dark environment for exploration. In the shuttle box test, no facilitation of the acquisition, but a permanent and quite significant increase in the intertrial activity has been found. We conclude that the lesions tend to decrease the emotivity of the subjects. An interpretation on the basis of the species -- specific defensive reactions explains the transitory and permanent effects of the lesions on the spontaneous activity.     

Effect of the conditions of adaptation of the optic analyzer to the function of the thermoreceptors of the human skin

Summary A discussion is presented of the effect produced by light stimulation applied to the optic analyzer alone on the function of the temperature analyzer. The cutaneous-temperature analyzer was kept on constant illumination and temperature. The light effects from the retinal photoreceptors on the cutaneous thermoceptor system led to reflex changes of the functional rate of the latter. Conditions of the optic analyzer of light adaptation caused reflex adjustment of cold receptors as to heating. Dark adaptation of the eyes changed the functional state of the cold receptors, corresponding to their adjustment to low temperatures.(Presented by Active Member AMN SSSR V. V. Parin) Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 57, No. 3, pp. 3–6, March, 1964