Blood:BCL6维持AML原始细胞的存活和自我更新,或可成为新的治疗靶点

2020-09-24 MedSci原创 MedSci原创

BCL6在AML细胞系和原代AML样本中的表达水平多变,且通常水平较高。除了单核细胞分化的AML之外,BCL6表达水平较高的AML通常对BCL6抑制剂治疗敏感。

BCL6是一种转录抑制因子和原癌基因,在先天性免疫系统、获得性免疫系统和淋巴系统肿瘤中均具有至关重要的作用。然而,它在髓系恶性肿瘤中的作用仍不清楚。

在本研究中,研究人员探讨了BCL6在急性髓系白血病(AML)中的作用。

BCL6在AML细胞/样本中的表达水平

BCL6在AML细胞系和原代AML样本中的表达水平多变,且通常水平较高。除了单核细胞分化的AML之外,BCL6表达水平较高的AML通常对BCL6抑制剂治疗敏感

经BCL6抑制剂处理的AML细胞的基因表达谱显示,BCL6抑制的靶基因和与DNA损伤检查点相关的转录程序被诱导激活,而干细胞基因则被下调了。在体外,用BCL6抑制剂处理原代AML细胞可诱导细胞凋亡,降低集落形成能力,这些效应与BCL6的表达水平相关。

重要的是,抑制或敲除原代AML细胞中的BCL6可显著降低小鼠的白血病启动能力,这表明白血病重新填充细胞的功能被消融了。相反,敲除或抑制BCL6基因并不抑制正常造血干细胞的功能。

BCL抑制剂和AraC联合治疗的AML移植瘤小鼠体内的人AML细胞比例明显降低

用阿糖胞苷(AraC)治疗可进一步诱导BCL6的表达,且BCL6的诱导程度与肿瘤细胞对AraC的抗性相关。用BCL6抑制剂联合Ara-C治疗AML患者来源的异种移植(PDX)模型显示这种联合应用增强了抗白血病活性。

总而言之,抑制BCL6或可为消融白血病再生细胞和提高对化疗的反应性提供一种新的治疗策略

原始出处:

Kawabata Kimihito Cojin,Zong Hongliang,Meydan Cem et al. BCL6 maintains survival and self-renewal of primary human acute myeloid leukemia cells. Blood, 2020 Sep 10.

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