Recurrent high level parvovirus B19/genotype 2 viremia in a renal transplant recipient analyzed by real-time PCR for simultaneous detection of genotypes 1 to 3

Organ transplant recipients infected with parvovirus B19 frequently develop persistent viremia associated with chronic anemia and pure red cell aplasia. In this study, a male renal transplant recipient who had been infected with parvovirus B19/genotype 2 after renal transplantation at the age of 34 years is described. The patient was repeatedly treated with high dose intravenous immunoglobulin (IVIG) that resulted in the resolvement of symptoms but not in virus eradication. During an observation period of 33 months after transplantation three phases associated with high parvovirus B19 viremia were observed. Both the first and the second viremic phases were combined with severe anemia. Parvovirus B19 specific IgM-antibodies were initially detected at the beginning of the second phase in continually rising concentrations. Initially eradication of the virus by immunoglobulin therapy was reported after the first viremic phase [Liefeldt et al. (2002): Nephrol Dial Transplant 17:1840-1842]. Retrospectively this statement has to be corrected. It was based on the use of a qualitative PCR assay specific for parvovirus B19 genotype 1 associated with reduced sensitivity for detection of genotype 2. After sequence analysis of the viral DNA and adjustment of a real-time PCR assay (TaqMan) for quantitative detection of all three B19 virus genotypes analysis of consecutive serum samples allowed the demonstration of long lasting phases with reduced viral loads following IVIG-treatment. These results demonstrate that IVIG treatment of parvovirus B19-triggered anemia in transplant recipients offers an opportunity to resolve symptoms, but does not guarantee eradication of the virus. Since reactivation of parvovirus B19 infection can result in high virus load associated with the recurrence of symptoms repeated screening for viral DNA is recommended using the TaqMan system established for quantitative detection of all three genotypes of parvovirus B19.     

P300, N400, aerobic fitness, and maximal aerobic exercise

Electrophysiological effects of aerobic fitness and maximal aerobic exercise were investigated by comparing P300 and N400 before and after a maximal cycling test. Event-related potentials (ERPs) were obtained from 20 students divided into two matched groups defined by their aerobic fitness level (cyclists vs. sedentary subjects). The session of postexercise ERPs was performed immediately after body temperature and heart rate returned to preexercise values. At rest, no significant differences were observed in ERP parameters between cyclists and sedentary subjects. This finding argued against the hypothesis that ERP modifications may be directly assumed by aerobic fitness level. The postexercise session of ERPs showed a significant P300 amplitude increase and a significant P300 latency decrease in all subjects. Similarly, N400 effect increased significantly after the maximal exercise in all subjects. ERP changes were of the same magnitude in the two groups. The present study argues for a general arousing effect of maximal aerobic exercise, independently of the aerobic fitness level.     

Gene therapy of amyotrophic lateral sclerosis

Two-year experiments were performed to evaluate the neurotrophic effect of hypoxia-inducible factors (vascular endothelial growth factor and angiogenin) expressed in recombinant human adenoviruses in amyotrophic lateral sclerosis. Randomized placebo-controlled trial demonstrated safety and good tolerability of the recombinant antiviral drugs. The life span of patients under conditions of hypoxia increased after treatment with the test drug, which was probably related to improved resistance of motoneurons. The presence of virus-neutralizing antibodies decreases the effectiveness of adenoviral vectors, which necessitates differential approach to the selection of patients and continuous monitoring of gene therapy. __________ Translated from Byulleten’ Eksperimental’noi Biologii i Meditsiny, Vol. 145, No. 4, pp. 467–470, April, 2008     

中晚期重型乙型肝炎血浆置换与内科治疗生存率的比较

观察血浆置换、内科治疗对中晚期重型乙型病毒性肝炎生存率的影响,探索中晚期重型肝炎的治疗方法。方法观察在内科治疗基础上给予血浆置换患者的肝功能、并发症及疾病的转归,与同期仅予内科综合治疗的患者相比较,对相应的临床资料进行统计学分析,从而了解两种治疗方法的疗效。结果血浆置换组36例,18例好转、18例死亡,内科治疗组32例,13例好转、19例死亡,两组之间患者生存情况无统计学差异;肝功能指标(ALT、AST、SB、ALB、TC、ChE和凝血酶原时间(PT)也无统计学差异。结论与内科治疗相比较,在其基础上给予血浆置换并不能提高中晚期重型病毒性肝炎生存率;中晚期重型肝炎患者的预后决定于其肝功能衰竭的程度。     

人TH基因重组腺病毒的构建及生物学活性研究

将人酪氨酸羟化酶cDNA表达盒克隆于质粒型腺病毒载体p△Elsp1A，得到重组质粒pAd－TH。随后用脂质体法将重组质粒pAd－TH和拯救型腺病毒质粒pBHG11一起共转染293细胞，通过体内同源重组生成重组腺病毒AdCMVth，THcDNA重组进入腺病毒E1区并受CMV启动子控制。采用形态学、病毒核酸酶切和PCR／RT－PCR等方法进行鉴定正确。重组腺病毒滴度达到1010pfu／ml。初步结果表明，该重组腺病毒感染MN9D细胞后可使细胞内多巴胺水平增加1倍，显示出明显的TH生物学活性。提示TH重组腺病毒AdCMVth可作为高效的基因转移载体用于帕金森氏病基因治疗。     

The influence of inspired oxygen on the oxygen uptake response to ramp exercise

The relation between and work rate (WR) was examined in seven male subjects who performed ramp (1 W·3 s^–1) two-legged cycle ergometry to exhaustion while inspiring either hypoxic (12% O₂), normoxic (21% O₂), or hyperoxic (40% O₂) air. The anaerobic threshold was estimated from respiratory gas exchange data and is thus referred to as the respiratory gas exchange threshold (RGET). Prior to the RGET, the was greater under normoxic [mean (SD); 10. 19(1.04) ml O₂·min^–1·W^–1] and hyperoxic [10.44 (0.72)] conditions compared with hypoxia [9.34 (0.89)]. Above the RGET, the for hypoxia [8.91 (0.63)], normoxia [10.40 (0.77)], and hyperoxia [11.08 (0.48)] were all significantly different from each other. These data indicated that for two-legged, cycle, ramp ergometry in normoxia below the RGET, both the and response time was constant. Above the RGET, the normoxic response was the net result of a declining and a longer response time to the unsteady state character of a ramp exercise protocol.     

靶向ANG-2的shRNA重组载体抑制人子宫内膜癌Ishikawa生长和侵袭的研究

目的 探讨采用RNA干扰(RNA interference,RNAi)抑制血管生成素-2(angiopoietin-2,ANC-2)基因的表达对人子宫内膜癌细胞Ishikawa细胞的影响.方法 采用脂质体LipofectamineTM 2000介导的方法将针对ANG-2基因的短发卡状RNA(short hairpin RNA,ahRNA)表达载体转染到人子宫内膜癌Ishikawa细胞中,逆转录聚合酶链反应及Western印迹法检测ANG-2 mRNA及蛋白的表达;噻唑蓝比色法检测Ishikawa细胞的增殖;荧光显微镜观察细胞形态;流式细胞仪检测细胞周期及凋亡;侵袭实验检测其对侵袭能力的影响.结果 人子宫内膜癌Ishikawa细胞ANG-2 mRNA及其蛋白质表达水平均显著降低;增殖被抑制,抑制率63.11%;细胞凋亡增加,细胞凋亡率与空白对照组和阴性对照组相比明显增高;细胞生长减慢,阻滞于G1期的增多,S期细胞减少;侵袭能力明显下降.结论 靶向ANG-2的shRNA能成功下调ANG-2基因的表达,抑制人子宫内膜癌Ishikawa细胞生长和侵袭.     

难治性便秘综合治疗及影响因素的评价

目的评价综合治疗对难治性便秘的疗效及影响因素。方法将84例难治性便秘分为非重叠组和重叠组。应用个体化综合治疗4周,观察便秘症状评分变化及总有效率,分析IC患者的重叠症状和心理障碍状态对疗效的影响。结果(1)84例便秘患者中,重叠组和非重叠组分别占40.5%和59.5%。(2)重叠组和非重叠组的总有效率分别为50.0%和78.0%(P<0.05)。(3)对37例IC患者的心理测试调查显示,59.4%(22/37)有心理障碍状态,重叠组和非重叠组伴有心理障碍状态对治疗的总有效率分别为4.8%和31.5%(P<0.05)。结论适合个体化的综合治疗使多数难治性便秘缓解症状,但伴有重叠症状,尤其心理障碍状态则影响疗效。     

解剖钢板结合连续被动运动功能锻炼治疗胫骨平台骨折

目的 评价解剖钢板结合连续被动运动(CPM)功能锻炼在治疗胫骨平台骨折中的应用价值.方法 2003年5月至2005年10月本院34例胫骨平台骨折行解剖复位、解剖钢板内固定并在术后进行CPM功能锻炼.结果 术后对患者行X线检查示骨折实现解剖复位或接近解剖复位.23例患者经5～30个月随访骨折均愈合,无植骨坏死发生.CPM功能锻炼后运动功能恢复优良率为82.6%(19/23).结论 采用关节面的解剖复位、解剖钢板及牢固固定后配合术后CPM功能锻炼对于胫骨平台骨折有很好的疗效.     

逆转录病毒载体介导乙型肝炎病毒反义基因的转录表达

为了探索在真核细胞内转录表达乙型肝炎病毒（ＨＢＶ）反义核酸的方法，用基因重组技术将ＨＢＶ前Ｃ／Ｃ基因（ＰｒｅＣ／Ｃ）和前Ｓ／Ｓ基因（ＰｒｅＳ／Ｓ）片段反向插入逆转录病毒载体质粒，再将重组体分别转染ＰＡ３１７包装细胞，进而获得能够介导ＨＢＶ反义基因向小鼠ＮＩＨ３Ｔ３细胞转移表达的重组逆转录病毒。经分子杂交试验表明，含有ＨＢＶ反义基因的重组逆转录病毒序列已经整合到转染的ＰＡ３１７细胞染色体上；转导的ＮＩＨ３Ｔ３细胞内有ＨＢＶ反义ＲＮＡ转录表达。结论：逆转录病毒载体包装细胞系统能够介导ＨＢＶ反义基因在真核细胞中转录表达，因而有可能利用反义技术和基因转移方法进行抗－ＨＢＶ基因治疗