鼠伤寒沙门菌的裂解气相色谱分析

应用裂解气相色谱分析１０株鼠伤寒沙门菌。结果表明：本沙门菌热裂解气相色谱图可分为Ａ类６株，其中ＩＡ组１株，ＩＢ组２株，ＩＣ组株；Ｂ类４株，其中２Ａ组２株，２Ｂ组２株。组内裂解气相色谱相同，组间裂解气相色谱相似。细菌裂解图谱与血清学和药敏之间未发现有规律性的联系。以上色谱图表现对鼠伤寒沙门菌的鉴定和色谱图库的建立有参考价值。     

需氧、厌氧菌暨L型同步培养方法的临床应用

将采集的标本同时接种在有氧、无氢、ＣＯ＿２环境和等渗、高渗培养基中，同步进行检测难治性感染症３０８例，总体阳性率９９．９２％，需氧菌２５．６５％，厌氧菌２．２７％、Ｌ型７１．１０％，药敏结果报告２４小时达７１．７５％，４８小时累计为９８．３７％。按单品种、足剂量、足疗程、由静脉投敏感（或中敏）药物治疗，大多数病例在７～９天治愈。     

重庆地区性传播疾病患者387例支原体培养及药敏试验结果分析

目的了解重庆地区性传播疾病(sexually transmitted disease,STD)患者支原体感染情况及其药物敏感试验结果.方法对387例支原体培养阳性的STD患者的支原体培养及药敏试验结果进行回顾性分析.结果在支原体感染患者中,以20～40岁患者为主要感染人群,男女比例无明显差别;解脲支原体(ureaplasma urealyticum,Uu)为主要病原体;在对9种药物进行的药敏试验结果中,交沙霉素、美满霉素及强力霉素敏感率较高,依次为94.06%、88.89%、86.82%,对克林霉素、阿齐霉素及罗红霉素的耐药率较高.结论对于Uu和人型支原体(Mycoplasma hominis,Mh)感染,临床医生应当结合药敏试验合理应用抗生素.目前重庆地区Uu和Mh感染的治疗可以首选交沙霉素及半合成四环素类抗生素进行治疗.     

vegf shRNA 对耐药白血病细胞化疗敏感性的增强作用

本研究采用RNA干扰技术探讨血管内皮生长因子(VEGF)对耐药白血病细胞K562/A02药物敏感性的影响及其机制。针对人vegf基因合成3个特异性shRNA干扰片段,采用脂质体介导的方法将其导入K562/A02细胞,用RT-PCR检测vegf及mrp1的mRNA表达水平,用Western blot检测VEGF、MRP1、AKT及P-AKT的蛋白表达情况,用MTT法检测阿霉素对各组细胞的半数抑制浓度(IC50),用流式细胞术检测细胞凋亡、胞内罗丹明123(Rho123)积聚情况。结果表明:转染vegf shRNA后,K562/A02细胞vegf的mRNA表达下调,其中vegf shRNA2组和vegf shRNA3组与HK组比较有显著差异(p<0.05),以vegf shRNA3组最显著,VEGF蛋白表达也出现下调,与mRNA的表达基本一致;MTT检测结果显示阳性转染组对阿霉素的敏感性增加,其中vegf shRNA2组和vegfshRNA3组的半数抑制浓度(IC50)与HK组比较具有显著的统计学差异(p<0.05);阳性转染组胞内Rho123积聚增多,与HK组比较均有统计学差异(p<0.05);阳性转染组细胞凋...     

Multidrug-resistant and extensively drug-resistant Mycobacterium tuberculosis: epidemiology and control

The emergence of multidrug-resistant (MDR)-TB and, more recently, of extensively drug-resistant (XDR)-TB is a real threat to achieve TB control and elimination. Over 400,000 new cases of MDR-TB occur each year and, although their number is currently unknown, XDR cases are recognized in every setting where there has been the capacity to detect them. The long-term vision for the full control of MDR-TB requires the scaling-up of culture and drug-susceptibility testing capacity, which is very limited in disease-endemic countries, and the expanded use of high-technology assays for rapid determination of resistance. MDR cases are treatable and well designed regimens, largely based on second-line anti-TB drugs, can considerably improve cure rates. However, treatment regimens need to be markedly improved through the introduction of less toxic and more powerful drugs, thus reducing duration of treatment and tolerability. This is of utmost importance for XDR-TB cases. The prevalence of MDR-TB and XDR-TB are inversely correlated with the quality of TB control and the proper use of second-line anti-TB drugs. Adherence to proper standards of care and control is imperative and a top priority of all TB control efforts. However, the risk of an uncontrollable epidemic of MDR- and XDR-TB is real considering current levels of financing and commitment to care.     

低分子RNA与高三尖杉酯碱联用对白血病细胞系HL-60细胞作用的实验观察

目的:研究低分子RNA与抗白血病药物高三尖杉酯碱联用对HL-60细胞药物敏感性的影响。方法:采用细胞形态学观察、四唑盐(MTT)比色法分析细胞增殖以及应用凯氏定氮法测定细胞蛋白质的含量。结果:①0.05~50μg/ml高三尖杉酯碱对HL-60细胞增殖有抑制作用,并与时间和剂量相关。②低分子RNA与高三尖杉酯碱联用能显著降低HL-60细胞的增殖率,并进一步降低细胞内蛋白质的合成。结论:低分子RNA能提高HL-60细胞对白血病药物高三尖杉酯碱的敏感性,两者联用能有效抑制白血病细胞系HL-60细胞的增殖。     

MicroRNA-93 activates c-Met/PI3K/Akt pathway activity in hepatocellular carcinoma by directly inhibiting PTEN and CDKN1A

To assess the role of microRNAs (miR) in hepatocellular carcinoma (HCC), we performed comprehensive microRNA expression profiling using HCC cell lines and identified miR-93 as a novel target associated with HCC. We further verified miR-93 expression levels in advanced HCC tumors (n=47) by a direct PCR assay and found that elevated miR-93 expression level is significantly correlated with poor prognosis. Elevated miR-93 expression significantly stimulated in vitro cell proliferation, migration and invasion, and additionally inhibited apoptosis. We confirmed that miR-93 directly bound with the 3′ untranslated regions of the tumor-suppressor genes PTEN and CDKN1A, respectively,and inhibited their expression. As a result of this inhibition, the c-Met/PI3K/Akt pathway activity was enhanced. IHC analysis of HCC tumors showed significant correlation between c-Met protein expression levels and miR-93 expression levels. Knockdown of c-Met inhibited the activation of the c-Met/PI3K/Akt pathway regardless of hepatocyte growth factor (HGF) treatment, and furthermore reduced the expression of miR-93 in these HCC cells. miR-93 also rendered cells to be more sensitive to sorafenib and tivantinib treatment. We concluded that miR-93 stimulated cell proliferation, migration, and invasion through the oncogenic c-Met/PI3K/Akt pathway and also inhibited apoptosis by directly inhibiting PTEN and CDKN1A expression in human HCC.     

我院3673株临床分离菌与药敏分析

目的了解我院抗菌药物应用与病原菌耐药现状,探讨抗菌药物用量与细菌耐药性变迁之间的关系,指导临床合理用药。方法收集、统计对比分析2007-2008年住院部常用抗菌药物应用频度与病原菌的耐药率。结果 2a来,11种抗菌药物应用频度（DDDs）增长迅速,增长率〉20%。病原菌监测结果显示标本阳性率55.88%,其中革兰阴性杆菌56.39%,革兰阳性球菌13.58%,真菌28.65%,主要分布于呼吸道、泌尿道、皮肤与组织。分离率排序前5位的病原菌分别是大肠埃希菌、肺炎克雷伯杆菌、金黄色葡萄球菌、鲍曼不动杆菌和铜绿假单胞菌,多药耐药菌株分离率及耐药率以不同程度逐年上升。结论需要加强临床抗菌药物应用管理与细菌耐药谱的监测,延缓及防止细菌耐药菌株的产生与传播。     

352株结核分枝杆菌药物敏感性结果分析

目的了解郴州地区结核分枝杆菌耐药情况,为临床及疾病控制机构提供有价值的数字。方法采用绝对浓度法进行结核分枝杆菌药物敏感性试验。结果352株结核分枝杆菌药敏结果显示：单药耐药顺序为INH（22．73％）SM（20．45％）RFP（15．91％）RFT（13．07％）EB和AMK（各3．41％）PTA（3．13％）PAS（0．57％）CAP和DiP（各0．0％）。总耐药率32．95％,耐多药率11．36％。结论郴州地区结核分枝杆菌总的耐药率和耐多药率均高于全国平均水平,需要更严格执行结核病控制策略,防止耐药病人及耐药菌株的产生和传播。     

患者活体组织分离的特殊真菌的药敏实验

本文采用药基点种法对从患者活体组织中分离的马尔尼菲青霉、微小根毛霉、球形阜孢霉以及1例罕见的全身性皮肤癣菌病的病原菌红色毛癣菌等进行了抗真菌药物的敏感性实验。结果显示:酮康唑、制霉菌素、的康唑和益康唑对4种真菌的抑菌效果优于其他抗真菌药物,如酮康唑对4种真菌MIC分别为1.56、6.25、25、3.13μg/ml,而大蒜素、克念菌素、5-氟胞嘧啶、十一烯酸锌的抑菌效果较差。