Flavonoid Bioactivity in Inflammatory Responses
Summary
Flavonoids are a diverse class of polyphenolic compounds widely distributed in fruits, vegetables and medicinal plants. Their anti-inflammatory bioactivity arises from the ability to modulate key cellular processes that drive the inflammatory response. At the cellular level, flavonoids can suppress the production of pro-inflammatory mediators such as nitric oxide and prostaglandins by downregulating inducible enzymes. They also interfere with transcription factors and signalling cascades, notably nuclear factor-κB and mitogen-activated protein kinases, thereby limiting the expression of cytokines and chemokines that recruit and activate immune cells. Beyond direct anti-inflammatory effects, flavonoids enhance endogenous antioxidant defences through activation of pathways such as Nrf2 (nuclear factor erythroid 2–related factor 2), which upregulates enzymes that neutralise reactive oxygen species. These dual functions—antioxidant and anti-inflammatory—help to restore tissue homeostasis in conditions characterised by excessive or chronic inflammation. Preclinical studies have demonstrated the potential of specific flavonoids to alleviate inflammatory markers in models of arthritis, colitis and metabolic syndrome, highlighting their promise as dietary supplements or lead compounds for drug development. Ongoing research seeks to improve bioavailability and target delivery, with an eye to translating these natural products into therapies for globally prevalent inflammatory diseases.
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Flavonoid Bioactivity in Inflammatory Responses publication trend
The graph below shows the total number of articles in flavonoid bioactivity in inflammatory responses across all publications each year (not limited to Nature Index journals).
Technical terms
Cytokines: Small signalling proteins secreted by immune cells to coordinate inflammation and immunity.
Nuclear factor-κB (NF-κB): A transcription factor that regulates genes involved in immune and inflammatory responses.
Mitogen-activated protein kinase (MAPK): Enzymes that transmit cellular signals from the surface to the nucleus, influencing inflammation.
Nrf2 (nuclear factor erythroid 2–related factor 2): A transcription factor that induces antioxidant and cytoprotective enzymes.
Lipopolysaccharide (LPS): A bacterial endotoxin used experimentally to trigger inflammatory responses in immune cells.
IC₅₀: The concentration of a compound required to inhibit a specific biological function by 50%.
References
- Flavonoids from the Roots of Sophora flavescens and Their Potential Anti-Inflammatory and Antiproliferative Activities. Molecules (2023).
- In vitro Anti-Inflammatory and Anti-Oxidative Stress Activities of Kushenol C Isolated from the Roots of Sophora flavescens. Molecules (2020).
- Five-Decade Update on Chemopreventive and Other Pharmacological Potential of Kurarinone: a Natural Flavanone. Frontiers in Pharmacology (2021).
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