NDLI: Peroxisome-proliferator-activated receptor α agonists inhibit cyclo-oxygenase 2 and vascular endothelial growth factor transcriptional activation in human colorectal carcinoma cells via inhibition of activator protein-1

Content Provider	PubMed Central
Author	Grau, Raquel Carmen, Punzón Fresno, Manuel Iñiguez, Miguel A.
Copyright Year	2006
Abstract	Recent evidence indicates that PPAR (peroxisome-proliferator-activated receptor) α ligands possess anti-inflammatory and antitumoural properties owing to their inhibitory effects on the expression of genes that are involved in the inflammatory response. However, the precise molecular mechanisms underlying these effects are poorly understood. In the present study, we show that tumour promoter PMA-mediated induction of genes that are significantly associated with inflammation, tumour growth and metastasis, such as COX-2 (cyclo-oxygenase 2) and VEGF (vascular endothelial growth factor), is inhibited by PPARα ligands in the human colorectal carcinoma cell line SW620. PPARα activators LY-171883 and WY-14,643 were able to diminish transcriptional induction of COX-2 and VEGF by inhibiting AP-1 (activator protein-1)-mediated transcriptional activation induced by PMA or by c-Jun overexpression. The actions of these ligands on AP-1 activation and COX-2 and VEGF transcriptional induction were found to be dependent on PPARα expression. Our studies demonstrate the existence of a negative cross-talk between the PPARα- and AP-1-dependent signalling pathways in these cells. PPARα interfered with at least two steps within the pathway leading to AP-1 activation. First, PPARα activation impaired AP-1 binding to a consensus DNA sequence. Secondly, PPARα ligands inhibited c-Jun transactivating activity. Taken together, these findings provide new insight into the anti-inflammatory and anti-tumoural properties of PPARα activation, through the inhibition of the induction of AP-1-dependent genes that are involved in inflammation and tumour progression.
Related Links	http://dx.doi.org/10.1042/bj20050964
Ending Page	88
Page Count	8
Starting Page	81
File Format	PDF
ISSN	02646021
e-ISSN	14708728
Journal	Biochemical Journal
Issue Number	Pt 1
Volume Number	395
Language	English
Publisher	Portland Press Ltd.
Publisher Date	2006-04-01
Access Restriction	Open
Rights Holder	Portland Press Ltd.
Subject Keyword	Cell Biology Biochemistry Molecular Biology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Molecular Biology Biochemistry

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