Histone deacetylase inhibitors induce attenuation of Wnt signaling and TCF7L2 depletion in colorectal carcinoma cells

Götze,Silke; Coersmeyer,Monique; Müller,Oliver; Sievers,Sonja

doi:10.3892/ijo.2014.2550

Histone deacetylase inhibitors induce attenuation of Wnt signaling and TCF7L2 depletion in colorectal carcinoma cells

Authors:
- Silke Götze
- Monique Coersmeyer
- Oliver Müller
- Sonja Sievers
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Affiliations: Max Planck Institute of Molecular Physiology, Dortmund, Germany, Swiss Institute for Experimental Cancer Research, Lausanne, Switzerland, University of Applied Sciences, Kaiserslautern, Germany
Published online on: July 21, 2014 https://doi.org/10.3892/ijo.2014.2550
Pages: 1715-1723

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Abstract

Histone deacetylase inhibitors (HDIs) specifically affect cancer cells by inducing cell cycle arrest, activate apoptotic pathways and re-activate epigenetically silenced tumor suppressor genes, but their pleiotropic mode of action is not fully understood. Despite the clinical effects of HDIs in the treatment of hematological malignancies, their potency against solid tumors is still unclear. We investigated the effects and mechanisms of HDI action in colorectal carcinoma cell lines with an activated Wnt signaling pathway, which is implicated in different aspects of tumorigenesis, including cell proliferation, apoptosis, angiogenesis and metastasis. We assessed the effects of HDI treatment in colorectal carcinoma cell lines by measuring histone hyperacetylation, cell viability and expression of Wnt target genes. Upon treatment with HDIs of the hydroxamate class, we found attenuation of Wnt signaling with concomitant induction of apoptosis and colorectal cancer cell death. Strikingly, the effects of HDIs on Wnt signaling were independent of histone hyperacetylation, thus we investigated the role of non-histone target proteins of histone deacetylases (HDACs). The compounds TSA and SAHA induced a rapid proteasome-dependent depletion of the Wnt transcription factor TCF7L2, which may be mediated by inhibition of HDAC 6 and 10. Our findings provide a molecular rationale for the use of HDIs against colorectal carcinomas with activated Wnt signaling.

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