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Molecular Cancer
Published in: Molecular Cancer 1/2017

Open Access 01-12-2017 | Research

ITIH5 mediates epigenetic reprogramming of breast cancer cells

Authors: Michael Rose, Vera Kloten, Erik Noetzel, Lukas Gola, Josef Ehling, Timon Heide, Steffen K. Meurer, Aljona Gaiko-Shcherbak, Antonio S. Sechi, Sebastian Huth, Ralf Weiskirchen, Oliver Klaas, Wiebke Antonopoulos, Qiong Lin, Wolfgang Wagner, Jürgen Veeck, Felix Gremse, Julia Steitz, Ruth Knüchel, Edgar Dahl

Published in: Molecular Cancer | Issue 1/2017

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Abstract

Background

Extracellular matrix (ECM) is known to maintain epithelial integrity. In carcinogenesis ECM degradation triggers metastasis by controlling migration and differentiation including cancer stem cell (CSC) characteristics. The ECM-modulator inter- α-trypsin inhibitor heavy chain family member five (ITIH5) was recently identified as tumor suppressor potentially involved in impairing breast cancer progression but molecular mechanisms underlying its function are still elusive.

Methods

ITIH5 expression was analyzed using the public TCGA portal. ITIH5-overexpressing single-cell clones were established based on T47D and MDA-MB-231 cell lines. Colony formation, growth, apoptosis, migration, matrix adhesion, traction force analyses and polarization of tumor cells were studied in vitro. Tumor-initiating characteristics were analyzed by generating a metastasis mouse model. To identify ITIH5-affected pathways we utilized genome wide gene expression and DNA methylation profiles. RNA-interference targeting the ITIH5-downstream regulated gene DAPK1 was used to confirm functional involvement.

Results

ITIH5 loss was pronounced in breast cancer subtypes with unfavorable prognosis like basal-type tumors. Functionally, cell and colony formation was impaired after ITIH5 re-expression in both cell lines. In a metastasis mouse model, ITIH5 expressing MDA-MB-231 cells almost completely failed to initiate lung metastases. In these metastatic cells ITIH5 modulated cell-matrix adhesion dynamics and altered biomechanical cues. The profile of integrin receptors was shifted towards β1-integrin accompanied by decreased Rac1 and increased RhoA activity in ITIH5-expressing clones while cell polarization and single-cell migration was impaired. Instead ITIH5 expression triggered the formation of epithelial-like cell clusters that underwent an epigenetic reprogramming. 214 promoter regions potentially marked with either H3K4 and /or H3K27 methylation showed a hyper- or hypomethylated DNA configuration due to ITIH5 expression finally leading to re-expression of the tumor suppressor DAPK1. In turn, RNAi-mediated knockdown of DAPK1 in ITIH5-expressing MDA-MB-231 single-cell clones clearly restored cell motility.

Conclusions

Our results provide evidence that ITIH5 triggers a reprogramming of breast cancer cells with known stem CSC properties towards an epithelial-like phenotype through global epigenetic changes effecting known tumor suppressor genes like DAPK1. Therewith, ITIH5 may represent an ECM modulator in epithelial breast tissue mediating suppression of tumor initiating cancer cell characteristics which are thought being responsible for the metastasis of breast cancer.
Appendix
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Metadata
Title
ITIH5 mediates epigenetic reprogramming of breast cancer cells
Authors
Michael Rose
Vera Kloten
Erik Noetzel
Lukas Gola
Josef Ehling
Timon Heide
Steffen K. Meurer
Aljona Gaiko-Shcherbak
Antonio S. Sechi
Sebastian Huth
Ralf Weiskirchen
Oliver Klaas
Wiebke Antonopoulos
Qiong Lin
Wolfgang Wagner
Jürgen Veeck
Felix Gremse
Julia Steitz
Ruth Knüchel
Edgar Dahl
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Molecular Cancer / Issue 1/2017
Electronic ISSN: 1476-4598
DOI
https://doi.org/10.1186/s12943-017-0610-2

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