人睾丸肿瘤抗原MAGE-E1基因的克隆测序及在原核系统中的表达

目的：扩增及克隆人的MAGE-E1基因并利用大肠杆菌进行表达。方法：从人胶质瘤细胞系BT-325中提取总RNA，用RT-PCR从中扩增出MAGE-E1基因片段。将MAGE-E1基因片段插入载体pGEM-T easy中，经全自动序列分析仪测序正确后，再克隆至表达载体pGEX-4T-2中，构建重组表达载体pGEX-4T-2-MAGE-E1，并转化大肠杆菌进行表达。结果：1mmol／L．异丙基-β-D-硫代半乳糖苷(IPTG)诱导5h，MAGE-E1蛋白表达即达高峰，SDS-PAGE及凝胶密度扫描分析表明，表达出Mr约41000大小的蛋白，占菌体总蛋白的35％。结论：成功扩增、克隆MAGE-E1基因，并在大肠杆菌中得到稳定高效表达。     

肝癌门静脉癌栓多排螺旋CT三维成像

目的 探讨门静脉癌栓多排螺旋CT3D成像的临床意义。方法 收集了57例门静脉3D成像,6例正常,5例肝硬化门脉高压,42例肝癌门静脉癌栓,4例肝门部淋巴结肿大患者,所有病例来源于肝脏常规双期扫描。对比剂按1.5-2ml/kg,对比剂注射流率2.5-3ml/s,门脉期延迟时间60-70s。对肝癌形成的42例门静脉癌栓进行轴位和3D成像观察,并行两组对照。结果 根据癌栓不同部位分为门脉左支(13例)、右支(20例)、主干(9例)3种类型。3D成像与轴位之间对显示门静脉癌栓没有差异性(P>0.05),但3D对显示主干栓塞形成的侧支循环优于轴位。结论 门静脉癌栓多排螺旋CT3D成像可较好地多方位显示癌栓部位及癌栓类型,CT3D成像和轴位结合可更好地对门静脉癌栓作出判断,以进一步指导临床对治疗方案的选择。     

Association of HPC2/ELAC2 polymorphisms with risk of prostate cancer in a population-based study.

Genetic polymorphism in HPC2/ELAC2 was recently associated with risk of sporadic prostate cancer. To determine the contribution of two HPC2/ELAC2 missense variants (Ser217Leu and Ala541Thr) to the risk of developing prostate cancer, we conducted a population-based case-control study of middle-aged men (40-64 years). Cases (n=591) were ascertained from the Seattle-Puget Sound Surveillance, Epidemiology, and End Results Cancer Registry and Controls (n=538) from the same general population were identified through random-digit dialing. Subjects were residents of King County, Washington, and were frequency matched on age. Cases (32%) had a slightly higher frequency of the Leu217 variant compared with controls (29%), but there were no differences in the frequency of the Thr541 allele (4%). When considering joint genotypes, white men homozygous for the Leu217 variant on an Ala541/Ala541 background had an increased risk of prostate cancer [odds ratio (OR)=1.84; 95% confidence interval (CI), 1.11-3.06]. Different risk profiles were also observed when cases were stratified by disease aggressiveness. Men with at least one Leu217 allele had an elevated risk (OR=1.34; 95% CI, 1.02-1.76) of less aggressive prostate cancer (localized stage and Gleason score < or = 7), with a stronger association among men with two Leu217 alleles (OR=1.73; 95% CI, 1.08-2.77). The Ala541Thr polymorphism was not associated with risk, and neither variant was associated with more aggressive prostate cancer phenotypes. We estimate that the Ser217Leu genotype may account for approximately 14% of less aggressive prostate cancer cases and 9% of all sporadic cases in the general United States population of white men 相似文献   

红藻氨酸诱导癫痫发作大鼠海马结构中EAAC-1变化

目的 研究谷氨酸转运蛋白亚型（ＥＡＡＣ－１）在红藻氨酸（ＫＡ）诱导癫痫发作大鼠海马结构中的变化。方法 用红藻氨酸诱导的复杂部分性癫痫模型,将２０只ＳＤ大鼠随机分为３,６,１２,４８ｈ及对照５组,用免疫蛋白印记法（Ｗｅｓｔｅｒｎ ｂｌｏｔ）观察ＥＡＡＣ－１在海马结构上的变化。结果 ＫＡ注射后３ｈ海马ＥＡＡＣ－１开始减少,６ｈ显著减少,１２ｈ后ＥＡＡＣ－１逐渐恢复。结论 ＥＡＡＣ－１表达的调控可能与Ｋ     

对41例儿童旋毛虫病的临床观察

为了解儿童旋毛虫病的临床特征，对１９９２～１９９５年就诊的４１例儿童旋毛虫病进行分析。结果表明，患儿来自河南６个地区，主要因食猪肉馅饺子、烤羊肉串或食涮猪肉而感染。冬季为本病的高发季节。患儿平均年龄为８．８岁，男女之比为２．７１。长期发热和嗜酸性粒细胞增多为本病的主要表现，仅少数患儿有肌痛、胃肠道症状和皮疹。眼睑水肿仅见于发病早期。血清学检查对诊断本病有重要意义。预防本病的关键措施是加强肉检和改变不良的饮食习惯。     

Knowledge and attitudes about otitis media risk: implications for prevention

OBJECTIVES: To investigate maternal knowledge and attitudes about otitis media (OM) risk, to estimate the prevalence of risk factors in the first year of life, and to identify barriers to the reduction of risk factors (eg, formula feeding, day care attendance, and exposure to passive smoke). METHODS: Questionnaires mailed to a systematic sample of 504 Minnesota women >/=18 years old identified through 1994 birth certificates. RESULTS: Eighty percent returned a completed survey. According to maternal report, 29% of infants (age 8 to 13 months) had recurrent OM (>/=3 episodes) and 2% had tympanostomy tubes. Forty-six percent attended day care, 29% had >/=1 smoking parent, and 49% breastfed for 相似文献   

新生儿窒息综合评分法的临床研究

探讨新生儿窒息的评分方法，为新生儿窒息的诊断提供可靠依据。方法随机选择100例正常儿和138例窒息儿作为研究对象。在Apgar评分基础上，经反复筛选提出9项参数作为新生儿窒息综合评分的指标。结果新生儿窒息综合评分的指标分别为呼吸（R）、心率（HR）、肤色（SC）、血氧饱和度（SAT）、血氧分压（PaCO2）．二氧化碳分压（PaO2）、脐血pH值（UB－pH）．无创血压（N－BP）及胎儿监护（CTG）等。初评方案Ⅰ由R、P、SC、SAT、CTG和UB－pH组成，初评方案Ⅱ由R、P、SC、CTG、PaO2和PaCO2组成．复评方案由pH、PaO2、PaCO2、SaO2、N－BP和Silverman呼吸评分组成。Apgar评分正常的新生儿采用初评方案Ⅰ、Ⅱ评价，分别有5％、8％的新生儿存在轻度窒息。Apgar评分属于窒息者，采用初评方案Ⅰ、Ⅱ评分均正常者4例，初评方案Ⅰ为正常者6例，初评方案Ⅱ为正常者8例。结论采用Apgar评分诊断新生儿窒息存在假阳性和假阴性。采用初评方案Ⅰ诊断新生儿窒息具有简便、快速、准确、重复性好等优点。     

阿霉素脂质体淋巴管灌注的靶向效果

目的：探讨阿霉素脂质体经淋巴管灌注后的体内动力学过程以及靶向效果。方法：将６０只家兔随机分为阿霉素脂质体和阿霉素水溶液两组，从家兔足背淋巴管给药，采用高效液相色谱（ＨＰＬＣ）法检测给药后各时点外周血及腹膜后淋巴结中阿霉素药物浓度，并将摘取的淋巴结作病理检查。结果：水溶液组腹膜后淋巴结阿霉素峰浓度（Ｃｍａｘ）为４６．８１μｇ／ｇ，药时曲线下面积（ＡＵＣ）为３１．８６μｇ／ｄａｙｇ－１；而脂质体组阿霉素峰浓度为９１．２３μｇ／ｇ，ＡＵＣ为１３８．３４μｇ／ｄａｙｇ－１。在外周血中脂质体组的峰浓度只有水溶液组的１／５。淋巴结病理检查结果表明，脂质体组的水肿、坏死、纤维化较水溶液组明显，而心肌病理反应较轻或不存在。结论：脂质体对淋巴结具有高度靶向性，阿霉素脂质体淋巴管灌注有可能成为治疗淋巴结转移的有效且副作用少的新方法。     

人卵巢癌裸鼠腹腔及网膜移植的研究

目的：建立既符合卵巢癌临床特征，又便于实验观察和分析的人卵巢癌裸鼠异种移植模型。方法：将体外培养的卵巢癌Ａｏ细胞接种于裸鼠皮下和腹腔内，并切取皮下移植瘤；在麻醉状态下对裸鼠进行网膜局部手术移植。结果：腹腔种植成瘤率为７０％（７／１０），肿瘤结节大小不一，分布广泛，其中２只腹水形成；网膜移植全部成瘤，移植瘤呈单一生长，易分离和切除，肿瘤重量一致性较好。结论：人卵巢癌裸鼠网膜异种移植模型直接反映肿瘤生物学行为，便于观察和分析实验结果，适于在卵巢癌实验研究中应用。