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Influence of apple polyphenols on inflammatory gene expression
Mathias Jung1, Sven Triebel, Timm Anke
1Department of Biotechnology, University of Kaiserslautern, Kaiserslautern, Germany.
Molecular Nutrition & Food Research
|September 19, 2009
Summary
Apple polyphenols, including procyanidin B(1), B(2), and phloretin, effectively inhibit inflammatory gene expression. These compounds show promise as natural inhibitors for inflammatory bowel diseases (IBD).
Area of Science:
- * Nutritional biochemistry and molecular biology.
- * Gastrointestinal health and disease research.
- * Phytochemistry and natural product drug discovery.
Background:
- * Inflammatory bowel diseases (IBD) involve excessive pro-inflammatory cytokine and chemokine release.
- * Apples (Malus spp., Rosaceae) are rich in polyphenols with potential health benefits, including anti-inflammatory properties.
- * Understanding the molecular mechanisms of apple polyphenols in IBD is crucial for therapeutic development.
Purpose of the Study:
- * To investigate the preventive effects of apple polyphenol extracts and constituents on inflammatory gene expression.
- * To analyze the impact on specific signaling pathways like NF-kappaB, IP-10, IL-8, and STAT1.
- * To identify key compounds responsible for the anti-inflammatory activity in apple juice extracts.
Main Methods:
- * Utilized human immunorelevant cell lines (DLD-1, T84, MonoMac6, Jurkat) stimulated with specific agents.
- * Employed DNA microarray analysis and quantitative real-time PCR (qRT-PCR) to assess gene expression.
- * Studied promoter activity, protein levels via cytokine arrays, and identified active compounds.
Main Results:
- * Apple juice extract AE04 significantly inhibited NF-kappaB-regulated genes (TNF-alpha, IL-1beta, CXCL9, CXCL10), enzymes (COX-2, CYP3A4), and transcription factors (STAT1, IRF1).
- * Procyanidin B(2) was identified as a primary contributor to AE04's anti-inflammatory activity.
- * Phloretin and procyanidin B(1) dose-dependently inhibited inflammatory gene expression and repressed key signaling pathways.
Conclusions:
- * Specific apple polyphenols, notably procyanidin B(1), procyanidin B(2), and phloretin, exhibit significant in vitro anti-inflammatory activity.
- * These compounds act as transcription-based inhibitors of pro-inflammatory gene expression.
- * Apple-derived polyphenols hold potential as therapeutic agents for managing inflammatory conditions like IBD.
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