Quercetin enhances chemotherapeutic effect of doxorubicin against human breast cancer cells while reducing toxic side effects of it

Biomedicine & Pharmacotherapy = Biomédecine & Pharmacothérapie
Shi-zheng LiKun Li

Abstract

Doxorubicin (Dox) is an efficient drug for breast cancer chemotherapy, however, its toxic side effects on non-tumor tissues, especially on myocardial cells, sometimes limit its clinical application. Therefore, it is necessary to develop a new drug, which can be combined with Dox to potentiate the anti-tumor effect of Dox at a lower concentration and attenuate the toxic side effects of it. Quercetin (Que) has anti-tumor activity in addition to its protective effects on various cells. By preparing human non-tumoral MCF-10A mammary cells, human breast cancer MCF-7 and MDA-MB-231 cells and human myocardial AC16 cells, here, we wanted to evaluate whether Que might represent such an agent and investigate its possible mechanisms of potentiating the anti-tumor effect of Dox at a lower concentration. The results showed that Que could increase intracellular accumulation of Dox in breast cancer cells through down-regulating the expression of efflux ABC transporters including P-gp, BCRP and MRP1, which can effectively eliminate cancerous cells including breast cancer stem cells (BCSCs), thereby potentiating the anti-tumor effect of Dox. Furthermore, Que attenuated the cytotoxicity of Dox to non-tumoral MCF-10A mammary cells and myocardial ...Continue Reading

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