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Epicatechin and a cocoa polyphenolic extract modulate gene expression in human Caco-2 cells
Véronique Noé1, Silvia Peñuelas, Rosa M Lamuela-Raventós
1Department of Biochemistry and Molecular Biology, School of Pharmacy, University of Barcelona, E-08028 Barcelona, Spain. vnoe@ub.edu
The Journal of Nutrition
|October 7, 2004
Summary
Epicatechin and cocoa extract alter gene expression in colon cancer cells. These findings support the antioxidant properties of cocoa flavonoids and suggest novel molecular mechanisms for their action.
Area of Science:
- Molecular Biology
- Genomics
- Cell Biology
Background:
- Epicatechin and cocoa polyphenols possess antioxidant properties.
- Colon adenocarcinoma cell line Caco-2 is a model for studying cellular responses.
- Functional genomics offers insights into molecular mechanisms of bioactive compounds.
Purpose of the Study:
- To investigate the effects of epicatechin and cocoa polyphenolic extract on gene expression in Caco-2 cells.
- To identify differentially expressed genes and validate changes at the mRNA and protein levels.
- To explore the molecular mechanisms underlying the action of cocoa flavonoids.
Main Methods:
- Functional genomic analysis using Human Hematology/Immunology cDNA arrays (406 genes).
- Treatment of Caco-2 cells with epicatechin and cocoa polyphenolic extract.
- Validation of gene expression changes by RT-PCR and Western blotting.
Main Results:
- Epicatechin altered the expression of 45 genes (21 downregulated, 24 upregulated).
- Cocoa polyphenolic extract altered the expression of 52 genes (24 downregulated, 28 upregulated).
- Expression changes in key genes (e.g., MAPKK1, STAT1, MRP1) were validated at mRNA and protein levels.
Conclusions:
- Cocoa flavonoids, including epicatechin, modulate gene expression in colon cancer cells.
- Observed gene expression changes align with the known antioxidant effects of cocoa flavonoids.
- Identified gene expression alterations suggest novel molecular mechanisms for flavonoid action.