FAK silencing inhibits leukemogenesis in BCR/ABL‐transformed hematopoietic cells

Focal adhesion kinase (FAK) is constitutively activated and tyrosine phosphorylated in BCR/ABL‐transformed hematopoietic cells, but the role it plays during leukemogenesis remains unclear. Here, we examined the effects of RNA interference‐mediated FAK silencing on leukemogenesis induced by a BCR/ABL‐transformed cell line. Transduction of BCR/ABL‐BaF3 cells with FAK shRNA inhibited FAK expression and reduced STAT5 phosphorylation, but induced caspase‐3 activation. In vitro studies showed that treatment with FAK shRNA resulted in impaired cell proliferation and colony formation, while increasing cell apoptosis. Mice that received transplants of BCR/ABL‐BaF3 cells with FAK shRNA displayed significantly prolonged survival time and diminished leukemia progression. In addition, FAK silencing enhanced in vitro and in vivo efficacy of ABL tyrosine kinase inhibitor imatinib in BCR/ABL‐BaF3 cells. Our results suggest that FAK is critical for leukemogenesis and might be a potential target for leukemia therapy. Am. J. Hematol. 2009. © 2009 Wiley‐Liss, Inc.     

原发性肝癌的遗传流行病学研究

目的　研究原发性肝癌的遗传模式 ,探讨本病的遗传与环境的交互作用。方法　采用Penrose法、简单分离分析和Falconer法对乙型肝炎表面抗原 (HBsAg)阳性队列中的 10 0例原发性肝癌家系资料进行遗传流行病学研究。先证者样本来自同地区 9万名 8年随访队列人群 ,分析遗传模式并将队列中家系样本发病情况分别与队列人群和一般人群的发病情况进行比较 ,计算遗传度。结果　先证者家系一级亲属肝癌发生率为 4 .0 % ,高于一般人群发生率 (0 .4 4 % ) ,也高于队列人群的肝癌发生率 (1.0 3% )。HBsAg阳性在先证者家系中存在聚集 ,且HBsAg阳性与肝癌的发生有强相关(OR =8.4 4 ,95 %CI :3.37～ 2 0 .0 6 ,P <0 .0 0 1) ;应用Penrose法计算 ,同胞肝癌发生率 一般人群肝癌发生率 (s q)接近 1 q1 2 ;简单分离分析提示不符合单因子遗传模式 ;与一般人群遗传度相比 (5 9%±7% ) ,队列人群遗传度h2 =4 2 %± 6 % ,P <0 .0 5。在控制了HBsAg后 ,一般人群遗传度下降为4 7%± 7% ,队列人群遗传度下降为 2 9%± 8%。结论　肝癌不符合单基因遗传模式 ,为一多因子疾病 ,受遗传与环境的综合影响。     

湿润烧伤膏联合敏感抗生素外用治疗压疮

目的探讨压疮治疗的有效方法。方法将90例溃疡期压疮患者随机分为观察组、对照Ⅰ组、对照Ⅱ组各30例。观察组清创后采用湿润烧伤膏外涂加敏感抗生素外敷治疗。对照Ⅰ组采用湿润烧伤膏外涂加抗生素全身治疗。对照Ⅱ组采用庆大霉素湿敷。结果观察组治愈率显著优于对照Ⅱ组。愈合时间显著短于对照Ⅰ组、Ⅱ组（均P〈0．01）；治愈率与对照Ⅰ组比较。差异无显著性意义（P〉0．05）。结论湿润烧伤膏外涂加敏感抗生素外敷治疗溃疡期压疮疗效显著。可促进创面愈合。     

浅谈教师业务档案在教学中的作用

随着现代社会的发展、教育体制的不断改革,给档案工作来了新的机遇和挑战,也带来了新的变化。在社会发展的今,人才市场的变化,使人们对档案的观念淡薄,尤其是对教师务档案不重视,对教师业务档案工作的重要性认识不足,凭惯印象看人,不善于利用教师档案全面看待和评价一个教师德才和工作业绩。这给教师档案管理这带来了不便与麻烦,在着收集与归档不系统、不完整,难以充分发挥教师档案在校工作中的服务作用。因此,必须引起学校的领导和学校档管理工作者的足够重视,以便使中专学校的教师业务档案工早日走上规范化、科学化的轨道。做好教师业务档…     

高效液相色谱法测定食品中大豆异黄酮

目的：建立高效液相色谱法测定食品中大豆异黄酮（包括染料木黄酮和大豆苷元）的含量，探讨样品的提取方法及测定影响因素。方法：样品经0.50mol/L盐酸回液和乙醇提取大豆异黄酮后，采用甲醇－0.01mol/L乙酸铵溶液（pH4.5)(60 40)作为流动相分离待测物质，等度洗脱，采用紫外检测器于254nm波长下测定。结果：染料木黄酮的检出限为0．04μg/ml，大豆苷元为0．05μg/ml，样品的加标回收率为91．4％－113．1％，日内和日间相对标准偏差分别为1．1％－2．8％和2．9％－5．1％。结论：本法简便、快速，易于推广普及，为大豆及其制品和保健食品中大豆异黄酮的检测和膳食摄取植物性雌激素提供了分析方法。     

中英药理学教学手段与考核方式的比较

药理学是医药学院校主干课程之一,教学内容丰富,教学难度大.本文对中英两国药理学的教学内容、教学手段及考核方式进行对比,分析了各自的优势与不足,以资交流.     

A Research on Subjective Well-being of Prison Police

Objective An investigation is conducted into the subjective well-being （SWB） of prison police and some related factors. Methods 273 prison police subjects from four provincial prisons finished Social Support Rating Scale and Index of Subjective Well-Being. Results （1） The degree of prison police＇s SWB is lower than that of ordinary people; （2） the degree of the female police＇s SWB working in the men-prisons is higher than that of their male fellowss; （3） the degree of the prison police＇s SWB working over 8 hours per day is lower than that of those working within 8 hours; （4） the degree of social support is closely relative to the SWB of prison police. Conclusion Prison police＇s SWB was worse than common people and especially it is necessary to improve the SWB level of the on-field prison police.     

生物素-亲合素预定位技术在肿瘤磁共振免疫成像中的初步应用研究

目的 :探讨生物 亲合素预定位技术提高肿瘤磁共振免疫成像诊断效果的可能性。材料和方法 :制备生物素化抗CEA单克隆抗体 (Bt McAb)、Gd标记生物素 (Gd DTPA Bt)和Gd DTPA McAb复合物 ;建立 8只荷人结肠癌裸鼠模型 ;实验组 (n =4)分别注射Bt McAb→链霉亲和素→Gd DTPA Bt预定位于裸鼠瘤结 ,观测注射前、注射后 3 0min、1、2、6、12、2 4和75h瘤结的信号变化 ;对照组分别注射Gd DTPA McAb或Gd DTPA(n分别为 2 ) ,在同样时间点成像。结果 :预定位技术法特异性提高了瘤结的增强程度 ,增强持续 2 4小时 ,增强程度高于Gd DTPA McAb组 ,与Gd DTPA的速升速降增强形式也不同。结论 :生物素 (链霉 )亲和素预定位技术可能有助于提高肿瘤磁共振效果     

Autoprocessing and self-activation of the secreted protease CPAF in Chlamydia-infected cells

The Chlamydia-secreted protease/proteasome-like activity factor (CPAF) is synthesized as a proenzyme (proCPAF) and requires processing for proteolytic activity. Recent structural studies have further demonstrated that CPAF is a serine protease that can undergo autoprocessing and self-activation in a concentration-dependent manner in vitro. However, it is not known how CPAF is processed and activated during chlamydial infection. In the current study, we used a mutant CPAF designated as CPAF(E558A) that is deficient in processing by itself as a substrate to search for putative CPAF activation factor(s) in Chlamydia-infected cells. CPAF(E558A) was processed by the lysates made from Chlamydia-infected cells and the processing activity correlated with the presence of endogenous active CPAF in the fractionated lysate samples. CPAF produced in the Chlamydia-infected cells is required for processing the mutant CPAF(E558A) since the processing activity was removed by depletion with anti-CPAF but not control antibodies. Furthermore, a purified and activated wild type CPAF alone was sufficient for processing CPAF(E558A) and no other chlamydial proteases are required. Finally, fusion tag-induced oligomerization can lead to autoprocessing and self-activation of the wild type CPAF in mammalian cells. These observations together have demonstrated that CPAF undergoes autoprocessing and self-activation during chlamydial infection.