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9,641 nM)相比,表达人FLT3-ITD(急性髓性白血病中的活化突变)的BaF3细胞对Cabozantinib敏感(IC50 = 15 nM)[2]。",{"key":247,"value":248},"体内研究","Cabozantinib(XL184)后肿瘤血管分布减少,3 mg\u002Fkg时降低67％,30 mg\u002Fkg降低83％[1]。在小鼠模型中,Cabozantinib显着改变肿瘤病理学,导致肿瘤和内皮细胞增殖减少,同时增加细胞凋亡和乳腺癌,肺癌和胶质瘤肿瘤模型中肿瘤生长的剂量依赖性抑制。重要的是,用Cabozantinib治疗不会增加转移实验模型中的肺肿瘤负荷,已经观察到VEGF信号传导抑制剂不靶向MET。基于体重剂量,Cabozantinib血浆暴露在大鼠中比在小鼠中高6至10倍,这导致在大鼠中诱导肿瘤生长抑制\u002F消退的较低剂量比在小鼠中小。卡博替尼的亚慢性给药在小鼠和大鼠中具有良好的耐受性,没有毒性迹象,这通过在治疗期间稳定和\u002F或增加体重来确定[2]。",{"key":250,"value":251},"激酶实验","使用荧光素酶偶联的化学发光，33P-磷酰基转移或AlphaScreen技术测定Cabozantinib对270种人激酶的广泛组的抑制特性。使用重组人全长，谷胱甘肽S-转移酶标签或组氨酸标签融合蛋白，并且通过测量每种相应激酶在Km或低于Km的ATP浓度下肽底物聚（Glu，Tyr）的磷酸化来确定IC 50值。通过测定ATP浓度范围内的IC50值，使用AlphaScreen Assay评估激酶抑制的机制[2]。",{"key":253,"value":254},"细胞实验","在多种人肿瘤细胞系中评估了Cabozantinib对增殖的影响，包括含有扩增的MET，SNU-1和SNU-16细胞的SNU-5和Hs746T细胞，MDA-MB-231和U87MG细胞，H441，H69，和PC3细胞系，以及BaF3细胞。将细胞在含有10％FBS的培养基中一式三份接种过夜。第二天，用连续稀释的Cabozantinib处理细胞48小时，然后使用Cell Proliferation ELISA，BrdUrd分析增殖[2]。",{"key":256,"value":257},"动物实验","小鼠[1] C57BL \u002F 6背景中的RIP-Tag2小鼠用作肿瘤模型。除非另有说明，否则RIP-Tag2小鼠在治疗开始时为10周龄。将Cabozantinib以5mg \u002F mL的浓度悬浮于无菌盐水或水中，并通过管饲法每天施用7天。每天通过强饲法治疗7天的小鼠研究剂量依赖性效应：XL880（1,10,20,40或60 mg \u002F kg），Cabozantinib（3,10,30,40或60 mg \u002F kg）或XL999 （25,40,50,60或75 mg \u002F kg）。在用XL880（40mg \u002F kg）处理6小时，1,4,7或14天的小鼠中研究作用的时间过程。在用XL880（40mg \u002F kg）处理7天的小鼠中研究戒断的影响，然后在0天，2天，7天或14天不进行治疗。每组含有4-6只小鼠。小鼠[2]使用雌性nu \u002F nu小鼠。将H441细胞（3×106）皮内植入后腹部，当肿瘤达到约150mg时，使用下式计算肿瘤重量:(肿瘤体积=长度（mm）×宽度2（mm2）] \u002F 2，小鼠随机分组（每组n = 5）并口服单次100mg \u002F kg剂量的Cabozantinib或载体。在指定的时间点收集肿瘤。合并的肿瘤裂解物用抗MET进行免疫沉淀，并用抗磷酸酪氨酸MET进行Western印迹。印迹剥离后，定量总MET作为上样对照。大鼠[2]在雌性Wistar大鼠的第0天，将C6细胞（5×106）皮下接种到后腹部。当肿瘤达到约250mg（3）植入后4天），将大鼠随机分组（每组8只）并用卡博替尼或水载体口服，每日一次口服治疗12天。通过口服强饲法以2mL \u002F kg给予卡博替尼。每日收集体重，并测量肿瘤重量每周收集两次。百分比肿瘤生长抑制\u002F回归值表示如下：1  -  [（第0天的平均治疗肿瘤重量 - 第0天的平均肿瘤重量）\u002F（最后一天的平均载体肿瘤重量 - 第0天的平均肿瘤重量）] ×100。通过单向ANOVA进行Cabozantinib治疗的肿瘤与媒介物治疗的肿瘤相对于给药前肿瘤的统计学分析，其显着性定义为P \u003C0.05。在最终剂量后4小时收集血液，并制备血浆以确定卡博替尼的浓度。",{"key":259,"value":260},"参考文献","[1].\nYou WK, et al. 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