Suppression of the dual-specificity phosphatase MKP-1 enhances HIF-1 trans-activation and increases expression of EPO.

Suppression of the dual-specificity phosphatase MKP-1 enhances HIF-1 trans-activation and increases expression of EPO.
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抑制双特异性磷酸酶 MKP-1 可增强 HIF-1 反式激活并增加 EPO 表达。

DOI:
10.1016/j.bbrc.2003.10.186
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发表时间:
2003-12
期刊:
Biochem Biophysi Res Commun
影响因子:
--
通讯作者:
樊代明
樊代明
中科院分区:
其他
文献类型:
--
作者:
刘长江;时永全;韩者艺;潘阳林;刘娜;韩霜;陈瑜;兰梅;乔泰东;樊代明

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缺氧诱导因子1 (Hypoxia-inducible factor 1, HIF-1)是一种磷酸化蛋白,其磷酸化参与HIF-1α亚基稳定以及调控HIF-1转录活性。在多种细胞系中,HIF-1α的磷酸化依赖于ERK或p38,这是丝裂原活化蛋白激酶(MAPK)超家族的两种成员。此外,活化的MAPK可以通过丝裂原活化的蛋白激酶磷酸酶-1 (MKP-1)去磷酸化而失活。MKP-1已被确定为缺氧反应基因,但其在细胞缺氧反应中的作用尚不清楚。我们发现缺氧诱导人肝癌细胞HepG2中MKP-1的表达具有时间依赖性。使用siRNA技术抑制MKP-1表达可以增强HIF-1α磷酸化,同时伴随着转录活性HIF-1的增加以及HIF-1诱导的促红细胞生成素表达水平的升高。
Hypoxia-inducible factor 1 (HIF-1) is a phosphorylated protein and its phosphorylation is involved in HIF-1α subunit stabilization as well as in the regulation of HIF-1 transcriptional activity. In a variety of cell lines, the phosphorylation of HIF-1α is dependent on ERK or p38, two members of the mitogen-activated protein kinase (MAPK) superfamily. In addition, active MAPK could be inactivated through dephosphorylation by mitogen-activated protein kinase phosphatase-1 (MKP-1). MKP-1 has been identified as a hypoxia responsive gene, but its role in the response of cells to hypoxia is poorly understood. Here we found that hypoxia induces MKP-1 expression in human hepatoma cells HepG2 in a time-dependent manner. Inhibition of MKP-1 expression using siRNA technique could enhance HIF-1α phosphorylation, accompanied by an increase in transcriptionally active HIF-1 as well as a rise in the levels of HIF-1-induced erythropoietin expression.
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