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2536还有效抑制一组32种人类癌细胞系的增殖,代表不同的器官来源(包括乳腺癌,结肠癌,肺癌,胰腺癌和前列腺癌,黑色素瘤和造血系统癌)肿瘤抑制因子或癌基因突变的模式(包括RB1,TP53,PTEN和KRAS状态)。该细胞组中的半数最大有效浓度(EC 50)值范围为2-25nM,而100nM BI 2536的浓度通常足以诱导完全有丝分裂停滞。指数生长的hTERT-RPE1,人脐静脉内皮细胞(HUVECs)和正常大鼠肾(NRK)细胞的增殖在12-31 nM的EC50值下被阻断,表明循环未转化细胞对BI 2536的敏感性相当[3] 。",{"key":232,"value":233},"体内研究","BI 2536(40-50mg\u002Fkg,iv)阻断免疫缺陷的nu\u002Fnu小鼠中人癌异种移植物的生长。连续循环40-50 mg\u002Fkg BI 2536每周静脉注射一次或两次,发现在多种异种移植模型中非常有效,例如HCT 116结肠癌,完全肿瘤抑制,每周两次(治疗后相对于对照(T\u002FC)值0.3％)和T\u002FC值16％,每周一次治疗;根据临床症状和没有重大体重变化判断,两种方案都具有良好的耐受性[3]。",{"key":235,"value":236},"激酶实验","Plk1，Plk2和Plk3的酶活性测定在连续稀释的抑制剂（BI 2536）存在下进行，其中20ng重组激酶和10mg来自牛乳的酪蛋白作为底物。激酶反应最终体积为60 mL，在30°C下进行45分钟（15 mM MgCl2,25 mM MOPS [pH 7.0]，1 mM DTT，1％DMSO，7.5 mM ATP，0.3mCiγ-P33-ATP ）。通过加入125mL冰冷的5％TCA终止反应。在将沉淀物转移至多筛混合酯纤维素滤板后，用1％TCA洗涤板并用放射性法定量。剂量 - 反应曲线用于计算IC50值[3]。",{"key":238,"value":239},"细胞实验","通过在各种浓度的BI 2536（10nM-1μM）存在下孵育72小时来进行细胞增殖测定，并通过在荧光分光光度计中测量Alamar Blue染料转化来评估细胞生长。从剂量 - 反应曲线拟合外推细胞生长被抑制50％（EC50）的有效浓度[3]。",{"key":241,"value":242},"动物实验","小鼠[3]雌性BomTac：NMRI-Foxn1nu小鼠皮下注射HCT 116结肠癌，NCI-H460或A549肺癌细胞，分别皮下注射2×106,1×106和1×107细胞进入每只小鼠的侧腹。当肿瘤达到约50mm 3的体积时，将动物配对进入治疗组和对照组，每组10只小鼠。在回归实验中，直到平均肿瘤体积达到500mm 3才开始治疗。将BI 2536以指定的剂量和时间表静脉内注射到尾静脉中。给药体积为每公斤体重10毫升。用卡尺每周测定肿瘤体积三次。通过以下公式将结果转换为肿瘤体积（mm 3）：长度×宽度2×π\u002F 6。确定小鼠的体重作为同一天耐受性的指标。对于统计学分析，在单侧（递减）精确Wilcoxon检验中将治疗组与媒介物对照组进行比较。",{"key":244,"value":245},"参考文献","[1].\nLénárt P, et al. The Small-Molecule Inhibitor BI 2536 Reveals Novel Insights into Mitotic Roles of Polo-like Kinase 1. Curr Biol. 2007 Feb 20;17(4):304-15.\n[2].\nChen L, et al. BRD4 Structure-Activity Relationships of Dual PLK1 Kinase\u002FBRD4 Bromodomain Inhibitor BI-2536. ACS Med Chem Lett. 2015 May 18;6(7):764-9.\n[3].\nSteegmaier M, et al. BI 2536, a Potent and Selective Inhibitor of Polo-like Kinase 1, Inhibits Tumor Growth In Vivo. Current Biology (2007), 17(4), 316-322.\n[4].\nJeong SB, et al. Essential role of Polo-like kinase 1 (Plk1) oncogene in tumor growth and metastasis of tamoxifen-resistant breast cancer. 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