Immunomodulatory Activities of Phytochemical Compounds

Phytochemical compounds derived from plants constitute an expanding repertoire of agents capable of modulating immune function. These naturally occurring molecules—including polysaccharides, flavonoids, terpenoids, alkaloids and glycosides—interact with both innate and adaptive arms of the immune system. Mechanistically, they may enhance pathogen clearance by stimulating macrophage phagocytosis and natural killer cell activity or temper excessive inflammation by inhibiting pro-inflammatory cytokine production and downregulating key enzymes such as cyclooxygenase-2. Their dual roles as immunostimulants and immunosuppressants position them as promising adjuncts in combating infections, limiting autoimmune flare-ups or improving cancer immunotherapy. Moreover, their structural diversity allows fine-tuning of bioavailability and target specificity, paving the way for the design of safer, both preventive and therapeutic, interventions. Globally, this area of research holds significant public health implications, offering cost-effective, plant-based strategies to enhance host defence in resource-limited settings and mitigate reliance on synthetic drugs with severe side-effect profiles.

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Immunomodulatory Activities of Phytochemical Compounds publication trend

The graph below shows the total number of articles in immunomodulatory activities of phytochemical compounds across all publications each year (not limited to Nature Index journals).

Technical terms

Innate immunity: The body’s first line of defence comprising cells and mechanisms that respond rapidly and non-specifically to pathogens.

Adaptive immunity: A specialised immune response involving antigen-specific lymphocytes that develop memory and stronger responses upon re-exposure.

Cytokines: Small signalling proteins released by immune cells to orchestrate inflammation, cell growth or inhibition.

Immunostimulant: A substance that enhances the activity of the immune system, promoting defence against infection.

Immunosuppressant: A substance that dampens immune responses, useful for controlling overactive or autoimmune conditions.

References

1. Medicinal Plants and Isolated Molecules Demonstrating Immunomodulation Activity as Potential Alternative Therapies for Viral Diseases Including COVID-19. Frontiers in Immunology (2021).
2. Plant-derived immunomodulators: an insight on their preclinical evaluation and clinical trials. Frontiers in Plant Science (2015).
3. Plant‐Derived Anti‐Inflammatory Compounds: Hopes and Disappointments regarding the Translation of Preclinical Knowledge into Clinical Progress. Mediators of Inflammation (2014).
4. Plants and Plant‐Derived Molecules as Natural Immunomodulators. BioMed Research International (2023).