砷剂对肺腺癌细胞凋亡及LRP、C—myc基因表达的影响

目的：研究三氧化二砷（arsenictrioxide,As2O3）对人肺腺癌的抑制和诱导凋亡作用及对肺耐药蛋白基因（1ungresistance protein,LRP）、C—myc基因表达的影响及可能机制。方法：选用人肺腺癌A549细胞株,运用体外细胞培养法,MTF法,流式细胞术检测As2O3,对人肺腺癌的抑制和诱导凋亡作用;用反转录-聚合酶链反应（RT—PCR）方法检测LRP、C—mycmRNA的表达。结果：As2O3对人肺腺癌A549细胞具有抑制作用,其抑制率呈时间-剂量依赖关系。不同浓度的As2O3均可诱导凋亡。1．0μmol／L、2．0μmol／L的As2O3可下调LRP的表达。结论：As2O3具有抑制肿瘤细胞增殖作用,主要是通过诱导细胞凋亡实现的,其机制与下调LRP、C—myc表达有密切关系。     

三氧化二砷对人胃癌细胞系MGC803凋亡及耐药基因表达影响的实验研究

目的:研究三氧化二砷(As2O3)对人胃癌细胞系MGC803的抑制和诱导凋亡作用及对MRP基因表达的影响.方法:选用人胃癌MGC803细胞系,运用体外细胞培养法,MTT法,流式细胞术检测As2O3对人其抑制和诱导凋亡作用;用逆转录-聚合酶链反应(RT-PCR)方法检测MRP mRNA的表达.结果:As2O3对人胃癌MGC803 细胞具有抑制作用,其抑制率呈时间-剂量依赖关系.不同浓度的As2O3均可诱导凋亡.1.0μmol/L、2.0μmol/L的As2O3可下调MRP mRNA的表达.结论:As2O3具有抗肿瘤作用,主要是通过诱导细胞凋亡实现的,其机制与下调MRP mRNA 表达有密切关系.     

番荔枝内酯单体squamocin诱导人肺腺癌A549细胞凋亡的实验研究

目的 观察番荔枝内酯单体squamocin对人肺腺癌A549细胞的体外增殖抑制及诱导凋亡的作用,并探讨squamocin诱导肿瘤细胞凋亡的机制。方法 MTT法检测不同浓度的squamocin对人肺腺癌A549细胞体外增殖的影响;流式细胞仪检测squamocin干预在不同时间点对人肺腺癌A549细胞凋亡率的影响;Western blotting检测squamocin干预前后细胞凋亡相关蛋白caspase-3、Bax和Bcl-2的表达情况。结果 MTT法显示,squamocin对人肺腺癌A549细胞的体外抑制作用随着squamocin浓度的增加和作用时间的延长而增强,24、48、72h半数抑制浓度（IC50）分别为16.54、9.28、6.17μg／ml;流式细胞仪检测显示,在24、48、72h实验组人肺腺癌A549细胞凋亡率之间及其与阴性对照组比较,差异均有统计学意义（P＜0.01）,其中实验组72h的细胞凋亡率最高,为（51.87±1.79）％Western blotting显示,squamocin干预后细胞凋亡相关蛋白caspase-3和Bax表达上调,Bcl-2表达明显下调。结论 squamocin可诱导人肺腺癌A549细胞凋亡,这可能与squamocin上调细胞凋亡相关蛋白caspase-3、Bax表达以及降低抑制细胞凋亡基因Bcl-2表达有关。     

Amorphigenin联合顺铂对人肺腺癌A549/DDP细胞的协同抗肿瘤作用

背景与目的 Amorphigenin是从紫穗槐属植物的种子中分离提取的鱼藤酮类化合物,研究发现amorphigenin对多种肿瘤细胞具有增殖抑制作用。本研究拟探讨amorphigenin对人肺腺癌耐顺铂细胞株A549/DDP的抗肿瘤作用及其可能的分子机制。方法采用CCK-8法测定A549/DDP细胞的增殖;克隆形成实验测定A549/DDP细胞的克隆形成;流式细胞术检测细胞的凋亡率;Western blot技术检测caspase-3、PARP和LRP蛋白的表达。结果Amorphigenin可抑制A549/DDP细胞的增殖48 h[半数抑制浓度（half maximal inhibitory concentra-tion, IC50）]为（2.19±0.92）μmol/L、抑制克隆形成及诱导细胞凋亡。此外,Amorphigenin与顺铂联合可协同地抑制A549/DDP细胞生长和促进凋亡;降低耐药蛋白LRP蛋白的表达。结论 Amorphigenin可抑制A549/DDP细胞增殖和促进细胞凋亡;amorphigenin可能是通过抑制耐药蛋白LRP蛋白表达,进而与顺铂对A549/DDP细胞产生协同抑制作用。     

下调CK2α基因表达抑制肺腺癌A549细胞的增殖和凋亡

目的:探讨下调CK2α基因表达后对肺腺癌A549细胞的影响.方法:构建pSilencerTM4.1-shCK2α-eGFP慢病毒表达载体,建立稳定干扰CK2α表达的A549细胞株.利用MTT、克隆形成、凋亡实验检测干扰CK2α基因表达后,A549细胞的增殖和凋亡的能力.利用Western blot检测细胞凋亡相关蛋白Caspase-3、Caspase-8、Bcl-xl、Bcl-2的表达.结果:下调CK2α基因表达后肺腺癌A549细胞增殖能力减低,促进细胞凋亡.细胞凋亡相关蛋白Caspase-3、Caspase-8上调,但Bcl-xl、Bcl-2蛋白明显下调.结论:下调CK2α基因表达后抑制肺腺癌A549细胞增殖、促进凋亡.     

藤黄酸调节肺腺癌A549细胞甾体类受体共激活因子3表达的意义

目的 观察藤黄酸对人肺腺癌细胞株A549增殖和凋亡的影响,及其对甾体类受体共激活因子3(SRC-3)表达的调控作用.方法 以不同浓度的藤黄酸处理人肺腺癌A549细胞,采用四甲基偶氮唑蓝(MTT)法检测细胞的增殖活性,Hoechst 33258染色法分析细胞凋亡的改变,共聚焦显微镜观察A549细胞中SRC-3蛋白的分布情况,Western blot和逆转录聚合酶链反应(RT-PCR)法检测藤黄酸对A549细胞中SRC-3 mRNA和蛋白表达的影响.结果 藤黄酸能明显抑制A549细胞的增殖,其抑制作用呈时间和浓度依赖性,24和48 h的半数抑制浓度(IC_(50))分别为(3.17.4±0.13)μmol/L和(1.85±0.08)gmol/L.藤黄酸能使A549细胞出现典型的细胞凋亡形态改变.空白对照组的A549细胞中,SRC-3 mRNA和蛋白均呈高表达,且主要分布于细胞核;经藤黄酸处理后,A549细胞中SRC-3 mRNA和蛋白的表达水平均明显下降.结论 藤黄酸能明显抑制人肺腺癌细胞3.549的增殖,并可能通过下调SRC-3 mRNA和蛋白的表达量而诱导A549细胞产生凋亡.藤黄酸有望成为治疗肺癌的新型靶点药物.     

三氧化二砷对人胃癌细胞系MGC803凋亡及耐药基因表达影响的实验研究

目的：研究三氧化二砷（As2O3）对人胃癌细胞系MGC803的抑制和诱导凋亡作用及对MRP基因表达的影响。方法：选用人胃癌MGC803细胞系,运用体外细胞培养法,MTT法,流式细胞术检测As2O3对人其抑制和诱导凋亡作用;用逆转录-聚合酶链反应（RT—PCR）方法检测MRPmRNA的表达。结果：As2O3对人胃癌MGC803细胞具有抑制作用,其抑制率呈时间-剂量依赖关系。不同浓度的As2O3均可诱导凋亡。1．0μmol／L、2．0μmol／L的As2O3可下调MRPmRNA的表达。结论：As2O3具有抗肿瘤作用,主要是通过诱导细胞凋亡实现的,其机制与下调MRPmRNA表达有密切关系。     

低氧条件下三氧化二砷对人肺腺癌A549细胞增殖的影响

目的:对比研究常氧和低氧条件下三氧化二砷（arsenic trioxide,As2O3）对人肺腺癌A549细胞增殖的抑制作用。方法:分别在常氧（21％ O2）和低氧（5％ O2）条件下以1、2、4 μmol/L As2O3处理人肺腺癌A549细胞，12、24、48 h后收集细胞，以MTT法检测细胞增殖抑制率，以Annexin VPI双染色流式细胞术检测细胞凋亡，分析两种条件下As2O3对细胞增殖抑制率及凋亡率的影响。结果: 常氧及低氧条件下，细胞增殖抑制率、细胞早期凋亡率及总凋亡率均随As2O3浓度的增加及作用时间的延长而增加（均P<0.05），晚期凋亡率变化不显著。在As2O3相同浓度、相同处理时间，低氧条件下细胞增殖抑制率及凋亡率较常氧条件下无明显降低。结论: As2O3可促进细胞凋亡，显著抑制A549细胞增殖，且在低氧条件下的上述作用未见减弱。     

三氧化二砷对人肺腺癌A549细胞株生长及对Survivin基因表达的影响

目的:研究三氧化二砷(As2O3)对人肺腺癌细胞株A549的生长抑制作用和对Survivin基因表达的影响,探讨As2O3抑制肺癌细胞增殖的机制。方法:体外培养A549细胞,通过不同剂量的As2O3与A549细胞株共培养,以台盼兰染色后鉴定活细胞计数,计算细胞生长抑制率及存活率;进一步应用Western blot方法检测Survivin表达情况;分析三氧化二砷抑制Survivin的表达水平与A549细胞存活的相关性。结果:As2O3能明显抑制A549细胞株的生长,具有浓度和时间依赖性;As2O3能明显下调Survivin蛋白的表达水平,亦具有浓度和时间依赖性;且Survivin蛋白的表达下调与肿瘤细胞存活率成负相关。结论:As2O3在体外可以明显抑制A549细胞株的生长,并显著抑制Survivin基因的表达。     

抗菌肽17BIPHE2对人肺腺癌细胞A549的抑制作用北大核心CSCD

目的探讨抗菌肽17BIPHE2对人肺腺癌细胞A549的抑制作用及其作用机制。方法 MTT法检测0~40μmol/L的抗菌肽17BIPHE2对A549细胞增殖的影响;流式细胞术和TUNEL染色检测细胞凋亡情况;Real-time PCR和Western blot检测Bax、Bcl-2的表达变化;透射电子显微镜观察细胞超微结构变化。结果 17BIPHE2可抑制A549细胞的增殖,其IC50值为34.33μmol/L,同时20、25、30、35、40μmol/L的17BIPHE2对A549细胞的生长抑制率分别为(1.8±2.7)%、(6.1±2.1)%、(24.6±4.6)%、(55.2±1.1)%、(76.3±1.2)%。与对照组相比,25、35μmol/L的17BIPHE2处理24h的A549细胞凋亡率显著增高(P<0.05),细胞核呈现固缩,染色质深染,线粒体嵴断裂,内质网肿胀等凋亡细胞的特征。Bax的表达上调(P<0.05),Bcl-2的表达受到抑制(P<0.05),Bax/Bcl-2比值升高。结论17BIPHE2可能是通过上调Bax表达,下调Bcl-2表达诱导A549细胞凋亡,抑制其增殖。     

Ringworm in animals in a farm in Assiut

Bericht über das Auftreten von Hautmykosen bei Tieren auf der Farm der Landwirtschaftlichen Fakultät der Universität Assiut. Von 70 Kälbern waren 42 pilzkrank, davon 22 durch T. mentagrophytes, 20 durch T. verrucosum. Von 180 Kühen waren 8 pilzbefalien, sämtlich durch T. mentagrophytes. Von 2 kranken Bullen wurde T. verrucosum isoliert. Auch die 3 Pferde und 2 Maultiere der Farm waren pilzinfiziert; Erreger war in diesen Fällen T. equinum. Auch ein Kalb war von T. equinum befallen. Die gleiche Pilzart wurde ferner von 3 Tierpflegern isoliert, die Pilzherde am Hals und an den Armen aufwiesen.     

Statistical challenges in preprocessing in microarray experiments in cancer

Many clinical studies incorporate genomic experiments to investigate the potential associations between high-dimensional molecular data and clinical outcome. A critical first step in the statistical analyses of these experiments is that the molecular data are preprocessed. This article provides an overview of preprocessing methods, including summary algorithms and quality control metrics for microarrays. Some of the ramifications and effects that preprocessing methods have on the statistical results are illustrated. The discussions are centered around a microarray experiment based on lung cancer tumor samples with survival as the clinical outcome of interest. The procedures that are presented focus on the array platform used in this study. However, many of these issues are more general and are applicable to other instruments for genome-wide investigation. The discussions here will provide insight into the statistical challenges in preprocessing microarrays used in clinical studies of cancer. These challenges should not be viewed as inconsequential nuisances but rather as important issues that need to be addressed so that informed conclusions can be drawn.     

Trends in zygomycosis in children

Zygomycosis, or mucormycosis, is associated with significant morbidity and mortality in both children and adults. Studies in adults have shown an increase in the incidence of zygomycosis, particularly among haemtopoietic stem cell transplant (HSCT) recipients and patients with haematologic malignancies. There is a paucity of data on the epidemiology of zygomycosis in children. We performed a retrospective analysis to describe trends in zygomycosis between 1 January 2003 and 31 December 2010. We used the Pediatric Health Information System (PHIS) database to identify paediatric patients who were diagnosed with zygomycosis during the study period. Administrative data on diagnoses, demographics, underlying conditions and clinical experiences were collected. Summary statistics were calculated and tests for trend were conducted. We identified 156 unique patients with zygomycosis. The prevalence of zygomycosis did not significantly increase over time (P=0.284). The most common underlying condition was malignancy (58%) and over half received intensive care. Voriconazole utilisation among all hospitalised children significantly increased during the period (P=0.010). Our study demonstrates that the incidence of zygomycosis is not significantly increasing. During the time period there was a significant increase in the use of voriconazole among children.     

Hemoglobin in lymphogranulomatosis in children

The peculiarities of hemoglobin content and properties in lymphogranulomatosis were studied in children by different methods. In most patients the content of fetal hemoglobin and methhemoglobin was found to increase and the rate of ferricyanide oxidation of hemoglobin also increases. Simultaneously, the rate of non-homogenicity of basic hemoglobin fractions was observed to increase on account of immunologically different components.     

Dermatomycosis in Goats in India

Summary: In an extensive survey involving 2176 goats 1.56% of goats manifested clinical lesions of ringworm infection. Animals below the age of 6 months were affected most (4.20%). The incidence of infection was higher during the winter months. T. verrucosum, T. mentagrophytes and M. gypseum were isolated from the skin scrapings of 12, 4, and 2 goats respectively. It is suggested that the infected animals could be a source of disease to human population in which the zoophilic dermatophyte invasion is characterized by severe inflammatory lesions of the skin. The zoonotic importance of different dermatophytes is stressed.
Zusammenfassung: In einer ausgedehnten Untersuchung an 2176 Ziegen wurden bei 1,56% klinische Zeichen einer Hautmykose festgestellt. Tiere, die jühger als 6 Monate alt waren, zeigten mit 4,20% am häfigsten Krankheitssymptome. In den Wintermonaten war die Erkrankungshäufigkeit am gröBten. T. vermcosum, T. mentagrophytes and M. gypseum wurden jeweils von 12,4 bzw. 2 Ziegen isoliert. Die inflzierten Tiere köinnen eine Infektionsquelle für die menschliche Bevölkerung darstellen und dort Mykosen mit stark entzündlichen Veränderungen auslösen. Die Bedeutung verschiedener Dermatophyten als Erreger von Zoonosen wird hervorgehoben.     

Sex hormones in women in rural China and in Britain

Plasma concentrations of certain hormones linked to breast cancer risk were measured in age-pooled samples from 3,250 rural Chinese women in 65 counties, and 300 British women, all aged 35-64. In age-groups 35-44, 45-54 and 55-64 respectively, mean oestradiol concentrations were 36% (P = 0.043), 90% (P less than 0.001) and 171% (P = 0.001) higher in the British than in the Chinese women, and mean testosterone concentrations were 48% (P less than 0.001), 68% (P less than 0.001) and 53% (P = 0.001) higher in the British than in the Chinese women. The difference in testosterone concentrations between the two countries appeared to be due largely to the lower average body weight in the Chinese women. Sex hormone binding globulin did not differ significantly between the two countries in age groups 35-44 and 45-54, but was 15% (P = 0.002) lower in the British than in the Chinese women at ages 55-64. Prolactin concentrations did not differ significantly between the two countries in any age group.     

Temozolomide treatment in glioma--experiences in two university hospitals in Finland

Thirty-two patients with relapsing glioma were treated with temozolomide in two university hospitals in Finland. One patient (3%) had complete response and 9 (28%) partial response, with 8 patients (25%) showing stable disease. Median progression-free survival for these 18 patients (56%) was 7 months (range 2-11+). The remaining either had progressive disease (25%) or only clinical evaluation (19%). Karnofsky score improved in 34% of patients and decreased in 3%. Symptoms were alleviated in 44% and deteriorated in 9%. Grade 3-4 toxicity was detected in 9% of the patients. Only 4% of the days in treatment were spent in hospital. An average 1.8 neuroradiological investigations, 6.9 laboratory visits, and 5.3 visits to the oncologist were made. This study confirms that temozolomide has positive effects on the outcome of often heavily pretreated glioma patients. High drug costs are compensated by prolonged home care and even the possibility to maintain working capacity.