Cancer Cell:抑制HLX基因改善急性髓细胞性白血病的治疗

2012-08-15 Beyond 生物谷

Yeshiva大学爱因斯坦医学院的科学家们在人类急性髓细胞性白血病(AML),一种罕见的、致命的癌症中获得了突破性研究进展,这可能意味着人们向新的急性髓细胞性白血病治疗方案又近了一步。他们的研究结果发表在今天的Cancer Cell杂志上。 细胞生物学和医学助理教授、医学博士Ulrich Steidl说:我们已经发现名为HLX的基因在白血病小鼠模型中白血病干细胞中异常高表达。 (基因表达的过程是

Yeshiva大学爱因斯坦医学院的科学家们在人类急性髓细胞性白血病(AML),一种罕见的、致命的癌症中获得了突破性研究进展,这可能意味着人们向新的急性髓细胞性白血病治疗方案又近了一步。他们的研究结果发表在今天的Cancer Cell杂志上。

细胞生物学和医学助理教授、医学博士Ulrich Steidl说:我们已经发现名为HLX的基因在白血病小鼠模型中白血病干细胞中异常高表达。 (基因表达的过程是由一个基因合成编码分子的过程,“过度表达”的基因使得其合成的蛋白也异常高表达)根据国家癌症研究所数据统计,每254人中就有一人在其一生将被诊断罹患AML。

大多数患者会在确诊的几年之内死亡,在过去几十年中,AML患者的生存率一直没有得到明显改善。Steidl博士和他的同事发现在小鼠体内HLX基因过度高表达,这引起造血干细胞功能失调,并发展成异常的白血细胞,进而无法分化成正常的血细胞。

相反,那些早期异常的白细胞会自身进行复制。然后,研究人员收集354例AML患者并分析了HLX表达数据,发现相比较于健康人,其中有87%的AML患者HLX是过度表达的。

在601例HLX表达水平高的患者中,患者HLX表达水平越高,他们的生存机会就越小。重要的是,当Steidl博士的研究小组使用实验室技术降低AML小鼠模型以及AML患者体内来源的白血病细胞HLX表达后,白血病细胞的增殖都被大大抑制。当研究人员将抑制HLX表达的小鼠白血病细胞和人白血病细胞这两种细胞移植到健康小鼠体内后,这些小鼠比白血病细胞未接受处理的小鼠活的更长。

这些结果表明,针对高表达的HLX可能是治疗白血病的一个有前途的新策略。Steidl博士说:HLX显然是造成白血病患者白细胞生产的关键因素。虽然研究仍处于初期阶段,但研究人员正在寻找药物,以此来提高白血病以及其他类型癌症的治疗。

编译自:Gene discovery could improve treatment for acute myeloid leukemia

 

doi:10.1016/j.ccr.2012.06.027
PMC:
PMID:

H2.0-like Homeobox Regulates Early Hematopoiesis and Promotes Acute Myeloid Leukemia

Masahiro Kawahara, Ashley Pandolfi, Boris Bartholdy, Laura Barreyro, Britta Will, Michael Roth, Ujunwa C. Okoye-Okafor, Tihomira I. Todorova, Maria E. Figueroa, Ari Melnick et al.

Homeobox domain-containing transcription factors are important regulators of hematopoiesis. Here, we report that increased levels of nonclustered H2.0-like homeobox (HLX) lead to loss of functional hematopoietic stem cells and formation of aberrant progenitors with unlimited serial clonogenicity and blocked differentiation. Inhibition of HLX reduces proliferation and clonogenicity of leukemia cells, overcomes the differentiation block, and leads to prolonged survival. HLX regulates a transcriptional program, including PAK1 and BTG1, that controls cellular differentiation and proliferation. HLX is overexpressed in 87% of patients with acute myeloid leukemia (AML) and independently correlates with inferior overall survival (n = 601, p = 2.3 106). Our study identifies HLX as a key regulator in immature hematopoietic and leukemia cells and as a prognostic marker and therapeutic target in AML.

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    2013-03-28 维他命
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    2012-08-17 chengjn
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