Polyphenol-Rich Fruit Beverage Extracts Reduce Cytokine Secretion in THP-1 Cells

Area of Science:

• Immunology
• Nutritional Science
• Phytochemistry

Background:

• Inflammation is a crucial immune response modulated by cytokines.
• Polyphenols, secondary plant compounds, can influence immune cell activity.
• Maintaining a healthy immune status may involve dietary factors like polyphenols.

Purpose of the Study:

• To investigate the anti-inflammatory potential of polyphenol-rich fruit extracts.
• To assess the inhibitory effects on pro-inflammatory cytokine secretion in THP-1 cells.
• To identify specific fruit extracts with significant anti-inflammatory activity.

Main Methods:

• Preparation of eleven polyphenol-rich extracts from various red fruit beverages using Amberlite® XAD-7 resin.
• Quantification of phenolic compounds using the Folin-Ciocalteu assay.
• Analysis of anthocyanins and other compounds via HPLC-DAD-ESI-MSⁿ.
• Measurement of pro-inflammatory cytokine (IL-1β, IL-6, IL-8, TNF-α) reduction using Lumit® Immunoassay.

Main Results:

• All eleven fruit extracts demonstrated high phenolic content.
• HPLC analysis confirmed the presence of diverse anthocyanins and related compounds.
• All extracts significantly reduced the secretion of key pro-inflammatory cytokines.
• Red grape and black currant extracts exhibited the strongest inhibitory effects.

Conclusions:

• Polyphenol-rich fruit extracts possess in vitro anti-inflammatory properties.
• These findings support the potential health-promoting effects of fruit juices.
• Further in vivo studies are warranted to confirm the anti-inflammatory efficacy in humans.