Coordinating Tissue Regeneration through TGF-β Activated Kinase 1 (TAK1) In-activation and Re-activation
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA521049 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR8534342_1.fastq.gz | Fastqsanger.gz | |||
| SRR8534342_2.fastq.gz | Fastqsanger.gz | |||
| SRR8534343_1.fastq.gz | Fastqsanger.gz | |||
| SRR8534343_2.fastq.gz | Fastqsanger.gz | |||
| SRR8534344_1.fastq.gz | Fastqsanger.gz |
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Project description:Transforming growth factor-b (TGF-b) regulates various aspects of vascular development, yet the signaling mechanisms of TGF-b in the control of angiogenesis remain poorly characterized. Here we show that homeodomain interacting protein kinases, HIPK1 and HIPK2, are transcriptional corepressors that regulate TGF-b-depednent angiogenesis during embryonic development. Loss of HIPK1 and HIPK2 leads to marked up-regulations of several potent angiogenic genes, including Vegf and Mmp10, which result in excessive endothelial proliferation and poor adherens junction formation. This robust phenotype can be recapitulated by siRNA knock down of Hipk1 and Hipk2 in human umbilical vein endothelial cells, as well as in endothelial cell-specific TGF-b type II receptor (TbRII) conditional mutants. The effects of HIPK proteins are mediated through its interaction with MEF2C and HDAC7, and this interaction can be further enhanced by TGF-b and TAK1. Remarkably, TGF-b-TAK1 signaling activates HIPK2 by phosphorylating a highly conserved tyrosine residue Y-361 within the kinase domain. Point mutation in this tyrosine completely eliminates the effect of HIPK2 in the transcriptional suppression of target genes. Together, these results reveal a previously unrecognized role of HIPK proteins in connecting TGF-b signaling pathway with the transcriptional programs for angiogenesis in early embryonic development.
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Project description:Transforming growth factor-b (TGF-b) regulates various aspects of vascular development, yet the signaling mechanisms of TGF-b in the control of angiogenesis remain poorly characterized. Here we show that homeodomain interacting protein kinases, HIPK1 and HIPK2, are transcriptional corepressors that regulate TGF-b-depednent angiogenesis during embryonic development. Loss of HIPK1 and HIPK2 leads to marked up-regulations of several potent angiogenic genes, including Vegf and Mmp10, which result in excessive endothelial proliferation and poor adherens junction formation. This robust phenotype can be recapitulated by siRNA knock down of Hipk1 and Hipk2 in human umbilical vein endothelial cells, as well as in endothelial cell-specific TGF-b type II receptor (TbRII) conditional mutants. The effects of HIPK proteins are mediated through its interaction with MEF2C and HDAC7, and this interaction can be further enhanced by TGF-b and TAK1. Remarkably, TGF-b-TAK1 signaling activates HIPK2 by phosphorylating a highly conserved tyrosine residue Y-361 within the kinase domain. Point mutation in this tyrosine completely eliminates the effect of HIPK2 in the transcriptional suppression of target genes. Together, these results reveal a previously unrecognized role of HIPK proteins in connecting TGF-b signaling pathway with the transcriptional programs for angiogenesis in early embryonic development. In this study, a total of 36,000 transcripts and ESTs (a total of 30,000 unique genes) was used to acquire expression profiles among the control, Hipk1-/-, Hipk2-/-, and Hipk1-/-;Hipk2-/- E9.5 embryos. This will allow us unsupervised and successfully to analyze the transcriptomes and finally to reveal the role of HIPK1 and HIPK2 in the signal transduction mechanism downstream of TGF-b and the transcriptional control of angiogenic gene expression during the critical stages of vascular morphogenesis.
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Project description:The inflammatory gene response requires activation of the protein kinase TAK1, but it is currently unknown how TAK1-derived signals coordinate transcriptional programs in the genome. We determined the genome-wide binding of the TAK1-controlled NF-κB subunit p65 in relation to active enhancers and promoters of transcribed genes by ChIP-seq experiments. Out of 35,000 active enhancer regions, 410 H3K4me1-positive enhancers show interleukin (IL)-1-induced H3K27ac and p65 binding. Inhibition of TAK1, IKK2 or depletion of p65 blocked inducible enhancer activation and gene expression. As exemplified by the CXC chemokine cluster located on chromosome 4, the TAK1-p65 pathway also regulates the recruitment kinetics of the histone acetyltransferase CBP, of NF-κB p50 and of AP-1 transcription factors to both, promoters and enhancers. This study provides a high resolution view of epigenetic changes occurring during the IL-1 response and allows the first genome-wide identification of a novel class of inducible p65 NF-κB-dependent enhancers in epithelial cells. ChIP-seq in KB cells with 5 different antibodies under different treatment conditions
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