The antitumor activities of flavonoids

Area of Science:

• Biochemistry
• Pharmacology
• Oncology

Background:

• Flavonoids are ubiquitous polyphenolic compounds in the human diet, derived from flowering plants.
• Traditional Asian medicine has utilized flavonoid-rich plants for disease prevention and treatment for millennia.
• Dietary patterns rich in fruits, vegetables, and tea, common in Asian populations, are associated with lower cancer risks, suggesting a role for flavonoids.

Purpose of the Study:

• To explore the potential of dietary flavonoids as natural chemopreventive and anticancer agents.
• To review the existing evidence on the antitumor actions of plant flavonoids.
• To identify promising flavonoid subclasses and their mechanisms of action against cancer.

Main Methods:

• In vitro studies on tumor cells examining direct and indirect flavonoid actions.
• In vivo studies in experimental animals assessing antitumor activity.
• Analysis of structure-activity relationships, focusing on the hydroxylation pattern of flavones and flavonols.

Main Results:

• Flavonoids exhibit diverse anticancer effects in vitro, including inhibition of cell growth, kinase activity, and tumor invasion, alongside apoptosis induction.
• Dietary flavonoids have demonstrated antitumor activity in experimental animal models.
• Specific hydroxylation patterns on the B ring of flavones and flavonols correlate with enhanced antiproliferative and protein kinase inhibitory activities.

Conclusions:

• Dietary flavonoids show significant potential as natural anticancer agents, targeting key cellular processes like signal transduction and angiogenesis.
• Flavonols and flavones, particularly those affecting protein tyrosine and focal adhesion kinases, are promising candidates for anticancer drug development.
• Further in vivo investigations are crucial to validate these findings and advance flavonoid-based anticancer strategies.