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Blood:USP22缺陷可通过PU.1依赖性机制阻断髓系分化促进急性髓系白血病的发生

2018-06-01 MedSci MedSci原创

中心点:Ras驱动的骨髓增生性肿瘤USP缺陷会阻断髓系分化促进向急性髓系白血病转变。USP22是一种PU.1脱泛素化酶,可正性调控PU.1的稳定性和髓系分化基因的表达。摘要:青少年粒单核细胞白血病(JMML)和慢性粒单核细胞白血病(CMML)常见Ras突变。JMML和CMML患者中分别有10%和50%会转变成急性髓系白血病(AML)。但是,额外事件如何与Ras协作促进上述转变目前基本尚未明确。Jo

中心点:

Ras驱动的骨髓增生性肿瘤USP缺陷会阻断髓系分化促进向急性髓系白血病转变。

USP22是一种PU.1脱泛素化酶,可正性调控PU.1的稳定性和髓系分化基因的表达。

摘要:

青少年粒单核细胞白血病(JMML)和慢性粒单核细胞白血病(CMML)常见Ras突变。JMML和CMML患者中分别有10%和50%会转变成急性髓系白血病(AML)。但是,额外事件如何与Ras协作促进上述转变目前基本尚未明确。
Johanna Melo-Cardenas等人意外的发现泛素特异性肽酶22(USP22)——与癌症进程相关的SAGA染色体重组复合物的组成成分——缺乏,会促进表达致瘤KrasG12D/+的小鼠发生AML转变。KrasG12D/+小鼠USP22缺陷,与对照小鼠相比,存活期缩短。这是由于髓系细胞分化受阻导致AML的发生。

向小鼠移植USP22缺陷的KrasG12D/+细胞后会自发形成侵袭性疾病,导致小鼠快速死亡。USP22缺陷型KrasG12D/+祖细胞的转录本类似白血病干细胞,与AML预后不良相关的基因高度一致。

研究人员还发现USP22可通过正性调节其蛋白稳定性、促进PU.1靶基因的表达来发挥PU.1脱泛素化酶的作用。在USP22缺陷型KrasG12D/+祖细胞中过表达PU.1可恢复其分化能力。

本研究结果揭示了USP22在Ras诱导的白血病发生中的作用,为进一步研究USP22的致癌作用提供新的视角。

原始出处:

Johanna Melo-Cardenas,et al. USP22 deficiency leads to myeloid leukemia upon oncogenic Kras activation through a PU.1 dependent mechanism. Blood  2018  :blood-2017-10-811760;  doi: https://doi.org/10.1182/blood-2017-10-811760

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    2018-06-02 wzb521zf

    一起学习学习

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    2018-06-01 龙胆草

    学习谢谢分享

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