目的 探讨核糖体翻译因子抑制剂阿维霉素对乙型肝炎病毒复制的抑制作用及分子机制.方法 使用不同浓度的阿维霉素处理肝癌细胞Hep3B,应用CCK-8检测细胞活性,流式细胞法检测细胞凋亡,qPCR方法检测病毒HBV-DNA、pgRNA、宿主MTIF2和RPL10基因表达量,ELISA免疫测法检测HBsAg和HBeAg,化学发光检测法对AFP进行定量检测,生物化学方法检测细胞外泌谷草转氨酶(AST)、谷丙转氨酶(ALT)和碱性磷酸酶(ALP)蛋白.结果 阿维霉素对Hep3B细胞增殖没有抑制作用,对细胞的凋亡也没有影响.但能促进细胞AST分泌,降低AFP外泌水平,对ALP分泌影响较小.在Hep3B细胞中,阿维霉素能通过干预MTIF2促使pgRNA表达量积累,反馈上调宿主RPL10和MTIF2基因mRNA表达.并能有效降低HBsAg、HBeAg和HBV-DNA水平.结论 阿维霉素能够抑制MTIF2翻译起始,通过影响翻译起始调控病毒组装蛋白的翻译进程,进而抑制乙肝病毒复制.

1 背景 我国新型冠状病毒肺炎(COVID-19)疫情自2019年12月于湖北省武汉市暴发,患者临床症状以发热、乏力、干咳等为主,并逐渐出现呼吸困难、急性呼吸窘迫综合征、脓毒症休克以及难以纠正的代谢性酸中毒和凝血功能障碍,并最终发展为严重的肺部感染,危及患者生命,导致死亡.截止目前,包括在美国、意大利、日本、新加坡、韩国、德国等国家发生全世界范围大流行,引发严重的公共卫生事件.我国将总结的宝贵抗疫经验集结成《新型冠状病毒实验室生物安全指南》、《新型冠状病毒感染的肺炎防控方案》、《新型冠状病毒感染的肺炎诊疗方案》等各类文件,并随时更新,用于规范和提升新冠肺炎防控措施[1-3],并鼓励通过多种形式开展生物安全教育,改善民众面对高致病性微生物生命健康威胁时的基本科学知识及生物安全意识不足的局面.

Objective To explore the lymphcyte subsets distribution in cerebrospinal fluid in patients with HIV infection ,and to investigate the clinical significance of the lymphocyte subsets in cerebrospinal fluid in HIV central nervous system complication . Methods 34 patients with HIV infection ,including 20 patients without nervous system symptoms (simple HIV group) and 14 pa‐tients with nervous system symptoms (neurological HIV group) ,and 15 cases of healthy people (control group) were selected . Flow cytometry was used to detect lymphocyte subsets ,and immunoturbidimetry was used to detect the level of IgG in cerebrospinal fluid .Results The percentage of CD8+ T cells was higher and percentage of CD4+ T cells was lower in the simple HIV group and neurological HIV group than those in the healthy control ,with statistically significant differences (P<0 .01) .The level of IgG in pa‐tients with HIV infection was higher than that in the healthy control group (P<0 .01) .While no significant difference were found in the percentage of B cells and NK cells among the there group (P>0 .05) .There were also no significant differece between the sim‐ple HIV group and neurological HIV group in the ratio of each lymphcyte subset in cerebrospinal fluid (P>0 .05) .Conclusion The immune disorder in cerebrospinal fluid in patients with HIV infection may appear in the early time before the nervous system com‐plication .The changing trends of lymphocyte subsets are consistent with the peripheral blood ,which demonstrate that the T lym‐phocyte subsets may be correlated with the nervous system symptoms of HIV .

目的 探讨血清肌钙蛋白I(TnI)和缺血修饰白蛋白(IMA)在急性冠状动脉综合征(ACS)早期诊断及预后评估中的价值,为临床的诊断治疗及预后提供更准确的实验室依据,以便及时进行临床干预.方法 收集543例ACS患者发病3小时内的血清样本,其中不稳定心绞痛(UA)180例、非ST段抬高心肌梗死(NSTEMI) 100例、ST段抬高心肌梗死(STEMI) 173例,以同期400例体检健康者作为对照组.全自动生化仪检测IMA、血糖(GLU)、血脂(TG、CHO、HDL、LDL),全自动化学发光仪检测TnI.各组间TnI、IMA比较采用非参数Mann-Whitney U检验,利用受试者工作特征(ROC)曲线分析抗TnI及IMA对ACS的早期诊断价值,采用二分类Logistic回归分析对ACS的预后因素进行评估.结果 UA组、NSTEMI组及STEMI组IMA水平分别为79.30 (77.50～ 86.00)、81.40(78.25～89.70)、83.46(80.01～90.04),均显著高于对照组[71.28(66.44 ～75.55)],而NSTEMI组和STEMI组TnI水平[0.65(0.173 ～3.523)、0.74(0.29～22.51)]也显著高于对照组[0.03(0.018～0.6)],TnI、IMA及联合诊断的ROC曲线下面积(AUC)分别为0.842、0.868、0.904.ACS患者30天内发生主要心脏不良事件(MACEs)的几率为16.70％ (88/527),发生MACEs组的血清TnI及IMA水平[0.41(0.11～16.43),89.10(84.20～93.89)]均高于未发生MACEs组[0.11(0.05 ～1.78),81.80(77.70～85.60)],多因素Logistic回归分析显示血清IMA水平是30天内MACEs发生的独立危险因素.结论 血清TnI、IMA均可作为ACS早期诊断的生物学标志,两者联合检测具有高敏感度和特异度,具有更强的诊断价值,血清IMA是ACS近期预后不良的独立危险因素,还可对ACS患者近期预后进行评估.