Role of Flavonoids from Phytomedicines in Herb-Drug Interactions Mediated by P-glycoprotein

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The herbal therapeutics St John's wort and Ginkgo biloba are used by cancer patients to alleviate symptoms of psychic disturbances associated with their condition. The possibility of interactions between flavonoid components of these herbs and anticancer treatment will be examined. Resistance to cancer chemotherapy often develops due to overexpression of the drug transporter P-glycoprotein (P-gp). Investigation of the interaction of the flavonoid components of herbal preparations and P-gp will establish whether the flavonoids alter the outcome of chemotherapy in resistant cancers in the short term. We will also examine whether exposure to flavonoids in herbal medicines and diets rich in flavonoids from fruit and vegetables affects development and progress of multidrug resistance over the long term.