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Wnt/β-catenin signaling induces the transcription of cystathionine-γ-lyase, a stimulator of tumor in colon cancer.

Abstract
Cystathionine-γ-lyase (CSE) is a major endogenous enzyme producing H2S which, as a third gasotransmitter, plays important roles in many physiological and pathological processes. The mechanism of regulating CSE gene expression is unclear and the roles of CSE/H2S in tumor also have not got a profound understanding, especially in colon cancer. Our study demonstrated that CSE gene expression was regulated by the Wnt pathway on transcriptional level. Activating the Wnt pathway by either Wnt3a or LiCl increased CSE mRNA and protein levels, while siRNA-mediated silence of β-catenin decreased CSE mRNA and protein levels. XAV939 treatment which accelerated β-catenin degradation could reduce CSE protein level. To reveal the mechanism, two TCF/LEF binding sites were found in CSE promoter whose activity had a positive response to β-catenin overexpression in 293T cells. Mutations of TCF/LEF binding sites led to an increase of the promoter activity. It indicated that TCF/LEF likely acted as a repressor to CSE gene transcription, and Wnt signal contributed to free β-catenin accumulation to possibly relieve the repression. Either knockdown of CSE by shRNA (shCSE) or its inhibition by PAG decreased SW480 cell proliferation, migration, and tumor xenograft growth in nude mice. In conclusion, we have demonstrated that the Wnt pathway regulates CSE gene expression on transcriptional level and CSE/H2S plays important roles in colon cancer.
AuthorsKun Fan, Na Li, Jingjing Qi, Peng Yin, Chao Zhao, Liying Wang, Zengxia Li, Xiliang Zha
JournalCellular signalling (Cell Signal) Vol. 26 Issue 12 Pg. 2801-8 (Dec 2014) ISSN: 1873-3913 [Electronic] England
PMID25193114 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
CopyrightCopyright © 2014 Elsevier Inc. All rights reserved.
Chemical References
  • Alkynes
  • TCF Transcription Factors
  • propargylglycine
  • Cystathionine gamma-Lyase
  • Glycine
Topics
  • Alkynes (pharmacology)
  • Animals
  • Binding Sites
  • Cell Line, Tumor
  • Cell Movement (drug effects, genetics)
  • Cell Proliferation (drug effects)
  • Colonic Neoplasms (enzymology, genetics, pathology)
  • Cystathionine gamma-Lyase (genetics, metabolism)
  • Gene Expression Regulation, Neoplastic (drug effects)
  • Gene Knockdown Techniques
  • Glycine (analogs & derivatives, pharmacology)
  • Humans
  • Mice, Nude
  • Mutation (genetics)
  • Promoter Regions, Genetic
  • TCF Transcription Factors (metabolism)
  • Transcription, Genetic (drug effects)
  • Up-Regulation (drug effects)
  • Wnt Signaling Pathway (drug effects, genetics)
  • Xenograft Model Antitumor Assays

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