GATA Factor-Dependent Positive-Feedback Circuit in Acute Myeloid Leukemia Cells.

GATA Factor-Dependent Positive-Feedback Circuit in Acute Myeloid Leukemia Cells.
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急性髓样白血病细胞中的GATA因子依赖性阳性反馈回路。

DOI:
10.1016/j.celrep.2016.07.058
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发表时间:
2016-08-30
期刊:
影响因子:
8.8
通讯作者:
Bresnick EH
Bresnick EH
中科院分区:
生物学1区
文献类型:
--
作者:
Katsumura KR;Ong IM;DeVilbiss AW;Sanalkumar R;Bresnick EH

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主调节转录因子加塔-2触发造血干细胞和祖细胞生成。GATA 2单倍不足与骨髓增生异常综合征(MDS)和急性髓性白血病(AML)有关,GATA 2过表达预示AML预后不良。然而,介导发病机制的加塔-2依赖性遗传网络的成分尚不清楚。我们描述了磷酸化加塔-2并增加加塔-2靶基因激活的p38依赖性机制。我们证明了这种机制在AML细胞中建立了一个促进生长的趋化因子/细胞因子回路。p38/ERK依赖性加塔-2磷酸化促进了GATA 2转录和靶基因表达的正性自身调节,包括IL 1B和CXCL 2。IL-1β和CXCL 2增强加塔-2磷酸化,从而增加加塔-2介导的转录激活。p38/ERK-GATA-2通过CXCL 2诱导刺激AML细胞增殖。由于GATA 2 mRNA与AML-M5中的IL 1B和CXCL 2 mRNA相关,并且这些基因的高表达预测细胞遗传学正常的AML的不良预后,因此我们提出该电路在特定的AML环境中具有重要的功能。Katsumura等人揭示了在急性髓性白血病细胞中放大选择靶基因处的加塔-2活性的信号传导机制。编码趋化因子CXCL 2和细胞因子IL-1β的加塔-2靶基因的表达与人类AML亚型中的加塔-2表达相关,并且高加塔-2/CXCL 2表达预示不良预后。
The master regulatory transcription factor GATA-2 triggers hematopoietic stem and progenitor cell generation. GATA2 haploinsufficiency is implicated in myelodysplastic syndrome (MDS) and acute myeloid leukemia (AML), and GATA2 overexpression portends a poor prognosis for AML. However, the constituents of the GATA-2-dependent genetic network mediating pathogenesis are unknown. We described a p38-dependent mechanism that phosphorylates GATA-2 and increases GATA-2 target gene activation. We demonstrate that this mechanism establishes a growth-promoting chemokine/cytokine circuit in AML cells. p38/ERK-dependent GATA-2 phosphorylation facilitated positive autoregulation of GATA2 transcription and expression of target genes, including IL1B and CXCL2. IL-1β and CXCL2 enhanced GATA-2 phosphorylation, which increased GATA-2-mediated transcriptional activation. p38/ERK-GATA-2 stimulated AML cell proliferation via CXCL2 induction. As GATA2 mRNA correlated with IL1B and CXCL2 mRNAs in AML-M5 and high expression of these genes predicted poor prognosis of cyto-genetically normal AML, we propose that the circuit is functionally important in specific AML contexts. Katsumura et al. uncover a signaling mechanism that amplifies GATA-2 activity at select target genes in acute myeloid leukemia cells. Expression of GATA-2 target genes encoding the chemokine CXCL2 and cytokine IL-1β correlates with GATA-2 expression in a subtype of human AML, and high GATA-2/CXCL2 expression predicts poor prognosis.
DOI: 10.1093/nar/gks281
发表时间: 2012-07
影响因子: 14.9
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