Trafficking of α1B-adrenergic receptor mediated by inverse agonist in living cells

AIM The project is aimed at understanding the action of inverse agonist at single molecule level and capturing the real time picture of molecular behavior of α1B-adrenergic receptor (AR) mediated by inverse agonist in living cells by single molecule detection (SMD). METHODS The location and distribution of α1B-AR was detected by laser confocal and whole cell ^3H-prazosin binding assay. Dynamic imaging of BODIPY-FL-labeled prazosin (Praz), specific antagonist of (1-AR, was observed in α1B-AR stably expressed human embryonic kidney 293 (HEK293) living cells. The detection of real-time dynamic behaviors of AR was achieved by using fluorescence-labeled AR and its ligand combined with SMD techniques. RESULTS α1B-AR was predominantly distributed on the cell surface and 8.2% of the total receptors were located in cytosol.

AFP-IgM复合物在肝癌中的表达与临床关系

目的 分析甲胎蛋白-IgM免疫复合物（AFP—IgM）在肝细胞癌（HCC）中的含量，探讨AFP-IgM对诊断肝癌的临床意义。方法采用酶联免疫吸附法与电化学发光法，对103名正常人、74例肝癌、43例肝硬化和58例脂肪肝病人血清AFP—IgM与甲胎蛋白（AFP）含量检测，并分析其与临床病理特点之间的关系。结果应用ROC曲线确定AFP-kM和AFP的最佳切割值分别为300Au／ml和10μg／L作为诊断学意义的临界值。在此切割值下，肝癌组AFP-IgM和AFP血清水平均高于脂肪肝组和健康体检组（P〈0．05）。对早期（Ⅰ与Ⅱ期）肝癌诊断时，AFP-IgM的ROC曲线下面积大于AFP（0．91vs0．82）；当肿瘤直径≤3cm时，AFP-IgM为（1090．4±571．8）Au／ml，而当直径〉3cm时，AFP-IgM为（604．9±749．9）Au／ml，两者比较P〈0．05。且AFP-IgM在诊断小肝癌时ROC曲线下面积大于AFP（0．92VS0．78）；AFP-IgM对性别、年龄、乙型肝炎表面抗原、肿瘤数量、包膜的相关性无统计学意义（P〉0．05），而与肿块大小和分期密切相关。结论AFP-IgM对早期（Ⅰ与Ⅱ期）肝癌和小肝癌（≤3cm）诊断具有重要作用，且对判断肝癌的肿瘤大小与分期等具有一定的临床意义。