Loss of p300 accelerates MDS-associated leukemogenesis.

Loss of p300 accelerates MDS-associated leukemogenesis.
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DOI:
10.1038/leu.2016.347
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发表时间:
2017-06
期刊:
影响因子:
11.4
通讯作者:
Nimer SD
Nimer SD
中科院分区:
医学1区
文献类型:
--
作者:
Cheng G;Liu F;Asai T;Lai F;Man N;Xu H;Chen S;Greenblatt S;Hamard PJ;Ando K;Chen X;Wang L;Martinez C;Tadi M;Wang L;Xu M;Yang FC;Shiekhattar R;Nimer SD

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DNA甲基化和组蛋白修饰的改变在人类恶性肿瘤中所起的作用尚不清楚。p300和CBP是两种不同但高度同源的赖氨酸乙酰转移酶(KATs),在几种癌症中发生突变,这表明它们具有肿瘤抑制因子的作用。在当前的研究中,我们发现p300(而非CBP)的缺失显著加速了Nup98 - HoxD13(NHD13)转基因小鼠的白血病发生,NHD13转基因小鼠是一种在表型上模拟人类骨髓增生异常综合征(MDS)的动物模型。p300缺失恢复了表达NHD13的造血干细胞和祖细胞(HSPCs)在体外自我更新以及在体内扩增的能力,同时增加了干细胞对称自我更新分裂并减少了细胞凋亡。此外,p300(而非CBP)的缺失促进了细胞因子信号传导,包括增强了HSPC区室中MAPK和JAK/STAT通路的激活。总之,我们的数据表明p300在阻止MDS向急性髓系白血病(AML)转化中起着关键作用,这一作用与CBP不同。
The role that changes in DNA methylation and histone modifications play in human malignancies is poorly understood. p300 and CBP, two distinct but highly homologous lysine acetyltransferases (KATs), are mutated in several cancers, suggesting their role as tumor suppressors. In the current study, we found that deletion of p300, but not CBP, markedly accelerated the leukemogenesis of Nup98-HoxD13 (NHD13) transgenic mice, an animal model that phenotypically copies human myelodysplastic syndrome (MDS). p300 deletion restored the ability of NHD13 expressing hematopoietic stem and progenitor cells (HSPCs) to self-renew in vitro, and to expand in vivo, with an increase in stem cell symmetric self-renewal divisions and a decrease in apoptosis. Furthermore, loss of p300, but not CBP, promoted cytokine signaling, including enhanced activation of the MAPK and JAK/STAT pathways in the HSPC compartment. Altogether, our data indicate that p300 plays a pivotal role in blocking the transformation of MDS to acute myeloid leukemia (AML), a role distinct from that of CBP.
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