Abstract
目的探讨CXCR4阻断剂AMD3100对白血病细胞与成骨龛黏附的影响及逆转白血病细胞耐药的作用。方法在生物衍生骨上接种白血病患者骨髓来源的间充质细胞,并诱导其分化为成骨细胞,构建一种仿生性的成骨龛,并用ELISA法检测培养上清中SDF-1的表达水平;然后在成骨龛中接种FLT3-ITD突变阳性的白血病细胞株MV4-11细胞,构建三维共培养体系,流式细胞术检测CXCR4的表达水平;在此共培养体系中加入AMD3100后,应用BCECF荧光标记测定白血病细胞的黏附率,流式细胞术分析阿糖胞苷(Ara-C)作用前后白血病细胞凋亡的变化。结果①白血病骨髓成骨细胞培养7、14、21 d上清中SDF-1含量分别为(304±18)、(410±28)和(396±16)pg/ml,第14天达高峰;MV4-11细胞CXCR4表达水平为(72±16)%。②AMD3100作用24 h,成骨龛对MV4-11细胞黏附率为(40.1± 8.1)%,而不加药物的对照组为(65.6±12.1)%,差异有统计学意义(P<0.05)。③加入Ara-C前,AMD3100作用组细胞的凋亡率为(5.6±0.8)%,对照组为(2.5±0.5)%。加入0.02、0.20、2.00 µg/ml Ara-C后,AMD3100作用组细胞凋亡率增加为(10.0±2.4)%、(17.8±2.3)%和(25.1±2.4)%,明显高于对照组[分别为(6.7±1.0)%、(10.3±1.5)%、(16.2±3.1)%](P值均<0.05)。结论AMD3100能够阻断骨髓成骨细胞龛和白血病细胞的相互作用,在逆转白血病细胞耐药中起重要作用。
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