Furocoumarins in Cancer Risk Assessment and Pharmacology

Furocoumarins are a class of photoactive plant secondary metabolites featuring a fused furan and coumarin ring structure. They occur widely in citrus fruits, parsnip, celery and several medicinal herbs. In pharmacological contexts, these compounds exhibit a dichotomy of effects: on one hand they possess anti-proliferative, anti-inflammatory and antioxidant properties that have been explored for chemopreventive and therapeutic applications; on the other hand their strong photosensitising capacity under ultraviolet A radiation raises concerns regarding DNA adduct formation, phototoxicity and carcinogenic potential. Their interactions with drug-metabolising enzymes, especially the cytochrome P450 family, can lead to significant food-drug interactions, as exemplified by grapefruit-juice inhibition of CYP3A4, which can alter plasma levels of co-administered medications. Mechanistic studies have elucidated furocoumarin-DNA crosslinking, modulation of P-glycoprotein efflux transporters and disruption of cell cycle regulators in tumour models. Risk assessment frameworks now integrate exposure estimates from dietary and topical sources alongside molecular data on photomutagenesis to refine guidance on safe consumption thresholds. Meanwhile, structural modifications of the geranyl sidechain of natural furocoumarins and the design of spin-labelled derivatives have yielded novel enzyme inhibitors with improved specificity and antitumour efficacy. Such advances underscore the global relevance of furocoumarins at the interface of photobiology, toxicology and oncology, guiding both public health recommendations and drug-development pipelines.

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Furocoumarins in Cancer Risk Assessment and Pharmacology publication trend

The graph below shows the total number of articles in furocoumarins in cancer risk assessment and pharmacology across all publications each year (not limited to Nature Index journals).

Technical terms

Furocoumarin: A photoactive plant secondary metabolite characterised by a fused furan and coumarin ring; capable of intercalating into DNA and forming crosslinks under UVA irradiation.

Cytochrome P450: A superfamily of haem-containing monooxygenase enzymes that metabolise xenobiotics and endogenous compounds; inhibition by furocoumarins can lead to drug-interaction effects.

Phototoxicity: Cellular or tissue damage induced by a chemical compound upon absorption of light, often leading to oxidative stress and DNA lesions.

P-glycoprotein: A membrane-bound efflux transporter that contributes to multidrug resistance in cancer by exporting chemotherapeutic agents from cells.

References

1. Bergaptol, a Major Furocoumarin in Citrus: Pharmacological Properties and Toxicity. Molecules (2024).
2. Bergamottin a CYP3A inhibitor found in grapefruit juice inhibits prostate cancer cell growth by downregulating androgen receptor signaling and promoting G0/G1 cell cycle block and apoptosis. PLOS ONE (2021).
3. Synthesis of Spin-Labelled Bergamottin: A Potent CYP3A4 Inhibitor with Antiproliferative Activity. International Journal of Molecular Sciences (2020).
4. Citrus Consumption and Risk of Melanoma: A Dose-Response Meta-Analysis of Prospective Cohort Studies. Frontiers in Nutrition (2022).