Immune evasion by oncogenic proteins of acute myeloid leukemia.

Immune evasion by oncogenic proteins of acute myeloid leukemia.
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DOI:
10.1182/blood-2013-09-526590
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发表时间:
2014-03-06
期刊:
影响因子:
20.3
通讯作者:
Mandelboim O
Mandelboim O
中科院分区:
医学1区
文献类型:
--
作者:
Elias S;Yamin R;Golomb L;Tsukerman P;Stanietsky-Kaynan N;Ben-Yehuda D;Mandelboim O

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PML-RARA和AML1-ETO是重要的致癌融合蛋白,在向急性髓性白血病(AML)的转化中起核心作用。这些融合蛋白是否使肿瘤细胞具有免疫逃避特性尚不清楚。在这里,我们发现两种致癌蛋白特异性下调CD48的表达,CD48是自然杀伤(NK)细胞激活受体2B4的配体,从而导致NK细胞的杀伤减少。我们证明这个过程是组蛋白去乙酰化酶(HDAC)依赖的,它是通过CD48信使RNA的下调介导的,并且用HDAC抑制剂(HDACi)治疗可以恢复CD48的表达。此外,通过染色质免疫感受(ChIP)实验,我们发现AML1-ETO直接与CD48相互作用。最后,我们发现携带这些特定易位的AML患者CD48表达较低。
PML-RARA and AML1-ETO are important oncogenic fusion proteins that play a central role in transformation to acute myeloid leukemia (AML). Whether these fusion proteins render the tumor cells with immune evasion properties is unknown. Here we show that both oncogenic proteins specifically downregulate the expression of CD48, a ligand of the natural killer (NK) cell activating receptor 2B4, thereby leading to decreased killing by NK cells. We demonstrate that this process is histone deacetylase (HDAC)-dependent, that it is mediated through the downregulation of CD48 messenger RNA, and that treatment with HDAC inhibitors (HDACi) restores the expression of CD48. Furthermore, by using chromatin immuoprecepitation (ChIP) experiments, we show that AML1-ETO directly interacts with CD48. Finally, we show that AML patients who are carrying these specific translocations have low expression of CD48.
2B4 作为小鼠自然杀伤细胞上的非主要组织相容性复合物结合抑制受体。
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