Introduction The natural product eupatorin has been reported to have antiproliferative activity in tumour cell lines, but the exact mechanism is unclear. The cytochromes P450 CYP1B1, CYP1A1, and CYP1A2 have been shown to participate in the activation of various xenobiotics, compounds derived from the diet as well as chemotherapeutic drugs. CYP1B1 and CYP1A1 have also been proposed as targets for cancer chemotherapy for their differential and selective overexpression in tumour cells. In this study, we aimed to identify a possible mechanism of action for the antiproliferative effect of eupatorin, which can be attributed to CYP1 family-mediated metabolism.

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