北京男性青年1991～1992年四季血清流感血抑抗体水平的分析研究

作者于１９９１年４、８、１１月和１９９２年２月在北京市北、东南和南３个部队营区共采集１２７９例血清，以当前国家流行的流感病毒株Ａ／京防／１／８６（Ｈ＿１Ｎ＿１），Ａ／济防／１５／９０（Ｈ＿３Ｎ＿２），Ｂ／沪防／２４／８８为抗原，检测血凝抑制杭体。人群对甲＿１抗体阳性率最高≥１：１０者８３％，ＧＭＴ（几何平均滴度）为３８．１。对甲＿３抗体次之，抗体阳性卒为５９％，ＧＭＴ２４．９。人群对乙型抗体最低，抗体阳性率为５６％，ＧＭＴ２１。从人群抗体春、夏、秋、冬四季结果分析，流感３个亚型抗体在春和秋分别出现高峰；甲＿１抗体以春季升高明显；甲＿３抗体以春、秋均升高明显；乙型抗体则以秋季升高明显。作者对１２７９例人群的呼吸道感染发病率作了统计；总发病率为５８％（７３６／１２７９），以冬季发病５３％（３９３／７３６）和夏季３０％（２２４／７３６）为高峰。     

白酒中敌敌畏的固相微萃取

用大口径毛细管柱气相色谱法、氢焰离子化检测器进行分析测定。该方法在０．５～１２ｍｇ／Ｌ浓度范围内有很好的线性关系。相关系数为０．９９８３；最低检测浓度可达０．０５ｍｇ／Ｌ。本方法把样品的萃取浓缩与进样分析一体化完成。整个分析过程不使用任何萃取溶剂     

冠心病患者右室舒张功能的变化

本文报道了应用脉冲多普勒超声心动图，通过测定多普勒三尖瓣口血流频谱参数，无创法估测冠心病患者右室舒张功能。结果表明：冠心病患者右室舒张功能受损，且与左室舒张功能受损呈正相关。提示导致左室功能受损的冠心病同时累及右室功能，左、右心室功能之间相互影响     

A comparative study of the influences of pulmonary arterial pressure and pulmonary capillary wedge pressure on impedance rheopneumogram in patients with three different diseases

Summary In the present study right heart catheterization and impedance rheopneumogram examinations were performed simultaneously on 21 patients suffering from congenital cardiovascular diseases with atrial or ventricular septal defect accompanied by the left to right shunt (CCD) and 17 patients suffering from rheumatic valvular disease with mitral stenosis (MS) in order to investigate the differences in the impedance rheopneumogram parameters between CCD patients and patients with chronic obstructive pulmonary disease (COPD) as well as between MS and COPD patients. The results showed that when patients with different diseases had the same level of pulmonary arterial pressure, CCD patients had significantly higher Hs than COPD patients, while MS patients had significantly higher Hd/Hs ratio than COPD patients and CCD patients. The linear regressional equation between Hd/Hs ratio and pulmonary capillary wedge pressure (PCWP) was as follows: PCWP(kPa) = 0.17+0.98 × Hd/Hs (n = 155,Y = 0.422,P< 0.001). These results suggest that, (1) impedance rheopneumographic regressional equations with Hs as one of the major variables suitable for predicting secondary pulmonary hypertension in COPD patients are not suitable for use on CCD patients, (2) Hd/Hs ratio is useful in clinical work as an index for differential diagnosis between MS and Cor Pulmonale, and (3) PCWP can be roughly and noninvasively measured based on the measurement of impedance rheopneumogram parameter Hd/Hs.     

Enhanced efficacy of radiation-induced gene therapy in mice bearing lung adenocarcinoma xenografts using hypoxia responsive elements

The aim of the present study was to investigate whether the hypoxia responsive element (HRE) could be used to enhance suicide gene (HSV-tk) expression and tumoricidal activity in radiation-controlled gene therapy of human lung adenocarcinoma xenografts. A chimeric promoter, HRE-Egr, was generated by directly linking a 0.3-kb fragment of HRE to a 0.6-kb human Egr-1 promoter. Retroviral vectors containing luciferase or the HSV-tk gene driven by Egr-1 or HRE-Egr were constructed. A human adenocarcinoma cell line (A549) was stably transfected with the above vectors using the lipofectamine method. The sensitivity of transfected cells to prodrug ganciclovir (GCV) and cell survival rates were analyzed after exposure to a dose of 2 Gy radiation and hypoxia (1%). In vivo, tumor xenografts in BALB/c mice were transfected with the constructed retroviruses and irradiated to a total dose of 6 Gy, followed by GCV treatment (20 mg/kg for 14 days). When the HSV-tk gene controlled by the HRE-Egr promoter was introduced into A549 cells by a retroviral vector, the exposure to 1% O(2) and 2 Gy radiation induced significant enhancement of GCV cytotoxicity to the cells. Moreover, in nude mice bearing solid tumor xenografts, only the tumors infected with the hybrid promoter-containing virus gradually disappeared after GCV administration and radiation. These results indicate that HRE can enhance transgene expression and tumoricidal activity in HSV-tk gene therapy controlled by ionizing radiation in hypoxic human lung adenocarcinoma.     

Cisplatin-controlled p53 gene therapy for human non-small cell lung cancer xenografts in athymic nude mice via the CArG elements

Cisplatin, a commonly used chemotherapeutic agent, causes tumor cell death by producing DNA damage and generating reactive oxygen intermediates, which have been reported to activate the early growth response-1 ( Egr-1 ) promoter through specific cis -acting sequences, termed CArG elements. The aim of this study was to construct an adenoviral vector containing CArG elements cloned upstream of the cDNA for human wt-p53 , and to observe the effect of this vector on human non-small cell lung cancer (NSCLC) xenografts in athymic nude mice when combined with cisplatin treatment. The adenoviral vector AdEgr–p53 was generated by inserting CArG elements upstream of human wt-p53 cDNA. Two human NSCLC cell lines of varying p53 gene status, A549 (containing wild-type p53 ) and H358 (containing an internal homozygous deletion of the p53 gene) were used for in vitro and in vivo experiments. Wt-p53 production in cultured tumor cells and xenografts treated with the combination of AdEgr–p53 and cisplatin were detected by enzyme-linked immunosorbent assays. The antitumor responses in nude mice with the A549 or H358 xenografts following treatment with AdEgr–p53 and cisplatin were observed. We found that p53 was produced in tumor cells and xenografts treated with a combination of AdEgr–p53 and cisplatin. Furthermore, the Egr-1 promoter is induced by cisplatin, and this induction is mediated in part through the CArG elements. There was an enhanced antitumor response without an increase in toxicity following treatment with AdEgr–p53 and cisplatin, compared with either agent alone. Cisplatin-inducible p53 gene therapy may provide a means to control transgene expression while enhancing the effectiveness of commonly used chemotherapeutic agents. This is a novel treatment for human NSCLC. ( Cancer Sci 2005; 96: 706 – 712)     

Synergistic down-regulation of telomerase by all-trans retinoic acid and antisense oligonucleotide in oral squamous cell carcinoma cell line (Tca8113)

Human telomerase, activated in about 90% of cancers, is mainly composed of hTR, hTERT and TP1. The exposed RNA template of hTR is an ideal target for antisense oligonucleotides (As-ODN); while recent findings indicate all-trans retinoid acid (ATRA) could effectively inhibit the expression of catalytic subunit-hTERT. The aim of this study was to investigate the effect of ATRA and As-ODN in oral squamous cell carcinoma and whether telomerase activity could be synergistically inhibited by them and thus therapeutically exploited in the future. As-ODN-hTR was transfected into human tongue squamous cell carcinoma cell line (Tca8113) with or without ATRA. Telomerase activity was examined by PCR-Elisa; viability was compared with growth curve; apoptotic rate was analyzed by Annexin V/PI double staining and hTERT expression was tested with western blot. Tca8113 cells displayed significant growth inhibition during the 9-day exposure to ATRA/As-ODN, especially to a combination of As-ODN-hTR and 5muM ATRA, correlating with the inhibition of telomerase expression. The relative telomerase activity was inhibited during treated with As-ODN-hTR alone, ATRA alone, or a combination of them. While without ATRA, the effect of As-ODN would disappear at 96h after transfection. As-ODN-hTR alone or combined with ATRA also significantly increase the apoptotic rate. Our findings provided direct evidence, in oral squamous cell carcinoma, As-ODN-hTR and ATRA could synergistically inhibit telomerase activity and telomerase protein in human tongue squamous cell carcinoma cells, which correlated with the induction of growth arrest.     

Disseminated Penicillium marneffei infection in acquired immunodeficiency syndrome: a case report

Penicillium marneffei(P.marneffei) is a facultative intracellular pathogen and the only therrmally dimorphic fugus. This fungal intection is cormmonly found in Southeast Asian,     

Co-localization of the heat shock protein and human immunoglobulin G in hepatocellular carcinoma

Elevatedlevelsofserumimmunoglobulinobservedpatientswithcancersofepithelialorigin,includicarcinomasofbreast,colon,andliver1,2havebe interpretedashumoralresponsesofhosttocanc growth.3Recently,Qiuetal4describedindetailth humancancersofepithelialorigin,includingcarcinom ofbreast,colon,liver,lung,establishedepithel cancerlines,produceimmunoglobulinG(IgG)inthe cytoplasm.Undernormalconditions,heatshockprotei(HSPs)havemultiplecellularfunctions,suchasfoldi andtranslocatingnewlysynthesizedproteins.Wh…