Functional genomic analysis reveals cross-talk between peroxisome proliferator-activated receptor γ and calcium signaling in human colorectal cancer cells

Craig R. Bush, Jennifer M. Havens, Brian M. Necela, Weidong Su, Lu Chen, Masahiro Yanagisawa, Panagiotis Z Anastasiadis, Rudy Guerra, Bruce A. Luxon, E Aubrey Thompson

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Activation of PPARγ in MOSER cells inhibits anchorage-dependent and anchorage-independent growth and invasion through Matrigel-coated transwell membranes. We carried out a longitudinal two-class microarray analysis in which mRNA abundance was measured as a function of time in cells treated with a thiazolidinedione PPARγ agonist or vehicle. A statistical machine learning algorithm that employs an empirical Bayesian implementation of the multivariate HotellingT2 score was used to identify differentially regulated genes. HotellingT2 scores, MB statistics, and maximum median differences were used as figures of merit to interrogate genomic ontology of these targets. Three major cohorts of genes were regulated: those involved in metabolism, DNA replication, and migration/motility, reflecting the cellular phenotype that attends activation of PPARγ. The bioinformatic analysis also inferred that PPARγ regulates calcium signaling. This response was unanticipated, because calcium signaling has not previously been associated with PPARγ activation. Ingenuity pathway analysis inferred that the nodal point in this cross-talk was Down syndrome critical region 1 (DSCR1). DSCR1 is an endogenous calcineurin inhibitor that blocks dephosphorylation and activation of members of the cytoplasmic component of nuclear factor of activated T cells transcription factors. Lentiviral short hairpin RNA-mediated knockdown of DSCR1 blocks PPARγ inhibition of proliferation and invasion, indicating that DSCR1 is required for suppression of transformed properties of early stage colorectal cancer cells by PPARγ. These data reveal a novel, heretofore unappreciated link between PPARγ and calcium signaling and indicate that DSCR1, which has previously been thought to function by suppression of the angiogenic response in endothelial cells, may also play a direct role in transformation of epithelial cells.

Original languageEnglish (US)
Pages (from-to)23387-23401
Number of pages15
JournalJournal of Biological Chemistry
Volume282
Issue number32
DOIs
StatePublished - Aug 10 2007

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Peroxisome Proliferator-Activated Receptors
Calcium Signaling
Colorectal Neoplasms
Cells
Calcium
Chemical activation
Genes
NFATC Transcription Factors
TCF Transcription Factors
Endothelial cells
Microarray Analysis
Bioinformatics
Microarrays
Computational Biology
DNA Replication
Metabolism
Learning algorithms
Small Interfering RNA
Ontology
Learning systems

ASJC Scopus subject areas

  • Biochemistry

Cite this

Functional genomic analysis reveals cross-talk between peroxisome proliferator-activated receptor γ and calcium signaling in human colorectal cancer cells. / Bush, Craig R.; Havens, Jennifer M.; Necela, Brian M.; Su, Weidong; Chen, Lu; Yanagisawa, Masahiro; Anastasiadis, Panagiotis Z; Guerra, Rudy; Luxon, Bruce A.; Thompson, E Aubrey.

In: Journal of Biological Chemistry, Vol. 282, No. 32, 10.08.2007, p. 23387-23401.

Research output: Contribution to journalArticle

Bush, Craig R. ; Havens, Jennifer M. ; Necela, Brian M. ; Su, Weidong ; Chen, Lu ; Yanagisawa, Masahiro ; Anastasiadis, Panagiotis Z ; Guerra, Rudy ; Luxon, Bruce A. ; Thompson, E Aubrey. / Functional genomic analysis reveals cross-talk between peroxisome proliferator-activated receptor γ and calcium signaling in human colorectal cancer cells. In: Journal of Biological Chemistry. 2007 ; Vol. 282, No. 32. pp. 23387-23401.
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AU - Yanagisawa, Masahiro

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