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BCL-xL is a target gene regulated by hypoxia-inducible factor-1{alpha}.

ABSTRACT: The transcription factor hypoxia-inducible factor-1alpha (HIF-1alpha) plays pivotal roles in physiology and pathophysiology. Constitutive or hypoxia-induced HIF-1alpha overexpression is observed in many types of cancers including prostate adenocarcinoma, in which it is associated with resistance to apoptosis and therapeutic agents. BCL-xL, a hypoxia-responsive, anti-apoptotic protein of the Bcl-2 family, is also overexpressed in prostate carcinoma and many other cancers. Despite this connection, whether BCL-xL expression is directly regulated by HIF-1alpha is not known. We used prostate cancer PC-3 cell with constitutive high HIF-1alpha level as a model to address this important question. We first generated prostate cancer PC-3 cells in which HIF-1alpha was stably knocked-down (HIF-KD) by using small interference RNA. BCL-xL was dramatically decreased in HIF-KD PC-3 cells, in parallel with sensitization to apoptosis with caspase-3 activation as well as decreased cell proliferation. We then demonstrated that HIF-1alpha directly regulated BCL-xL transcription by binding to a hypoxia-responsive element in the BCL-xL promoter (-865 to -847) by reporter gene assay, chromatin immunoprecipitation, and electrophoretic mobility shift and supershift assays. HIF-1alpha-dependent BCL-xL overexpression may be an important mechanism by which HIF-1alpha protects prostate cancer cells from apoptosis and leads to treatment resistance.

SUBMITTER: Chen N

PROVIDER: S-EPMC2665055 | biostudies-literature | 2009 Apr

REPOSITORIES: biostudies-literature

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BCL-xL is a target gene regulated by hypoxia-inducible factor-1{alpha}.

Chen Ni N Chen Xueqin X Huang Rui R Zeng Hao H Gong Jing J Meng Wentong W Lu Yiping Y Zhao Fang F Wang Lin L Zhou Qiao Q

The Journal of biological chemistry 20090210 15

The transcription factor hypoxia-inducible factor-1alpha (HIF-1alpha) plays pivotal roles in physiology and pathophysiology. Constitutive or hypoxia-induced HIF-1alpha overexpression is observed in many types of cancers including prostate adenocarcinoma, in which it is associated with resistance to apoptosis and therapeutic agents. BCL-xL, a hypoxia-responsive, anti-apoptotic protein of the Bcl-2 family, is also overexpressed in prostate carcinoma and many other cancers. Despite this connection, ...[more]

PMID: 19211554

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Project description:ObjectivesHIF2α is of vital importance in the regulation of endothelial dysfunction, cell proliferation, migration, and pulmonary vascular remodeling in pulmonary hypertension. Our previous studies demonstrated that conditional and inducible deletion of HIF2α in mouse lung endothelial cells, dramatically protected the mice against vascular remodeling and the development of pulmonary arterial hypertension (PAH). Here, we provide a novel transcriptome insight into the impact of HIF2α in PAH pathogenesis and the potential to use HIF2α-mediated gene sets to differentiate PAH human subjects.MethodsUsing transcriptome data, we first tapped the value of the difference in gene expression profile between wild type (WT) and Hif2a knockdown (KD) cell lines. We considered the deregulated genes between WT and Hif2a-KD cells as HIF2α influenced genes. By examining the lung tissue transcriptome data set with nine controls and eight PAH patients, we evaluated the HIF2α regulatory network in PAH pathogenesis to further determine the identification ability of HIF2α-mediated gene sets in human PAH subjects. On the other hand, using peripheral blood mononuclear cells (PBMCs) transcriptome data from PAH patients and healthy controls, we further validated the potential of the HIF2α-mediated PBMC gene sets as a possible diagnostic tool for PAH. To verify the ability of HIF2α-mediated gene sets for the identification of PAH, endothelial cell-specific Phd2 knockout mice with spontaneous pulmonary hypertension were used for reverse validation experiments.Results19 identified GO biological process terms were significantly correlated with the genes down-regulated in Hif2a-KD cells, all of which are strongly related to the PAH pathogenesis. We further assessed the discriminative power of these HIF2α-mediated gene sets in PAH human subjects. We found that the expression profile of the HIF2α-mediated gene sets in lung tissues and PBMCs were differentiated both between controls and PAH patients. Further, a significant positive correlation was observed between hypoxia and Phd2 deficiency mediated gene set expression profiles. As expected, 7 of the 19 significantly down-regulated GO terms in Hif2a-KD cells were found to overlap with the up-regulated GO gene sets in Phd2 EC-/- mice compared to WT controls, suggesting opposing effects of HIF2α and PHD2 on PAH pathogenesis.ConclusionHIF2α-mediated gene sets may be used to differentiate pulmonary arterial hypertension.

Dataset Information

BCL-xL is a target gene regulated by hypoxia-inducible factor-1{alpha}.

Publications

BCL-xL is a target gene regulated by hypoxia-inducible factor-1{alpha}.

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