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The reactive tumor microenvironment: MUC1 signaling directly reprograms transcription of CTGF

Oncogene volume 29, pages 5667–5677 (2010)Cite this article

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Abstract

The MUC1 cytoplasmic tail (MUC1.CT) conducts signals from spatial and extracellular cues (growth factor and cytokine stimulation) to evoke a reprogramming of the cellular transcriptional profile. Specific phosphorylated forms of the MUC1.CT achieve this function by differentially associating with transcription factors and redirecting their transcriptional regulatory capabilities at specific gene regulatory elements. The specificity of interaction between MUC1.CT and several transcription factors is dictated by the phosphorylation pattern of the 18 potential phosphorylation motifs within the MUC1.CT. To better appreciate the scope of differential gene expression triggered by MUC1.CT activation, we performed microarray gene expression analysis and chromatin immunoprecipitation (ChIP)–chip promoter analysis and identified the genome-wide transcriptional targets of MUC1.CT signaling in pancreatic cancer. On a global scale, MUC1.CT preferentially targets genes related to invasion, angiogenesis and metastasis, suggesting that MUC1.CT signaling contributes to establishing a reactive tumor microenvironment during tumor progression to metastatic disease. We examined in detail the molecular mechanisms of MUC1.CT signaling that induces the expression of connective tissue growth factor (CTGF/CCN2), a potent mediator of ECM remodeling and angiogenesis. We demonstrate a robust induction of CTGF synthesis and secretion in response to serum factors that is enabled only when MUC1 is highly expressed. We demonstrate the requirement of phosphorylation at distinct tyrosine motifs within the MUC1.CT for MUC1-induced CTGF expression and demonstrate a phosphorylation-specific localization of MUC1.CT to the CTGF promoter. We found that MUC1 reorganizes transcription factor occupancy of genomic regions upstream of the CTGF gene, directing β-catenin and mutant p53 to CTGF gene regulatory elements to promote CTGF expression and destabilizing the interaction at these regions of the transcriptional repressor, c-Jun. With this example we illustrate the capacity of MUC1.CT to mediate transcription factor activity in a context-dependent manner to achieve wide spread and robust changes in gene expression and facilitate creation of the reactive tumor microenvironment.

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Authors and Affiliations

  1. Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE, USA

    M E Behrens, P M Grandgenett, J M Bailey, P K Singh, C-H Yi & M A Hollingsworth

  2. Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA

    M E Behrens, P K Singh & M A Hollingsworth

  3. Department of Biostatistics, College of Public Health, University of Nebraska Medical Center, Omaha, NE, USA

    F Yu

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  1. M E Behrens
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  2. P M Grandgenett
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Correspondence to M A Hollingsworth.

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Behrens, M., Grandgenett, P., Bailey, J. et al. The reactive tumor microenvironment: MUC1 signaling directly reprograms transcription of CTGF. Oncogene 29, 5667–5677 (2010). https://doi.org/10.1038/onc.2010.327

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