Diet-derived polyphenols inhibit angiogenesis by modulating the interleukin-6/STAT3 pathway

Area of Science:

• Oncology
• Nutritional Science
• Molecular Biology

Background:

• Epidemiological studies link plant-rich diets to reduced cancer risk, attributed to phytochemicals like polyphenols.
• Lifestyle factors such as obesity and inactivity promote chronic inflammation, a key driver of tumor progression.
• Inflammatory cytokines, particularly IL-6, play a critical role in cancer development and progression.

Purpose of the Study:

• To investigate the anti-angiogenic effects of plant-derived polyphenols.
• To elucidate the mechanisms by which polyphenols inhibit IL-6-induced angiogenesis.
• To identify specific polyphenols effective against IL-6/STAT3 pathway activation.

Main Methods:

• In vitro assays to assess the inhibitory effects of various polyphenols on IL-6-induced angiogenesis.
• Analysis of the IL-6/STAT3 signaling pathway, including STAT3 phosphorylation and downstream targets.
• Evaluation of endothelial cell proliferation, migration, and morphogenic differentiation.
• Measurement of IL-6 receptor (IL-6Rα), MMP-2, and SOCS3 protein expression.

Main Results:

• Apigenin and luteolin demonstrated potent inhibition of angiogenesis by targeting the IL-6/STAT3 pathway.
• These polyphenols modulated extracellular signal-regulated kinase-1/2 (ERK1/2) signaling activated by IL-6.
• Significant reductions were observed in endothelial cell proliferation, migration, and differentiation.
• Modulation of IL-6Rα expression, MMP-2 secretion, and SOCS3 protein levels was noted.

Conclusions:

• Apigenin and luteolin are effective inhibitors of IL-6-induced angiogenesis through the STAT3 pathway.
• These findings highlight the potential of dietary polyphenols in cancer chemoprevention.
• The study provides mechanistic insights into how diet influences cancer progression via inflammatory pathways.