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Breast cancer (BC) is the most prevalent diagnosed tumor and the major reason for tumor-related death in females around the world. Isoliquiritin, a type of plant extract, has exhibited a probable inhibitory effect in a variety of cancers. However, the anti-tumor effect on BC is still unclear. To reveal the effect and potential mechanism of Isoliquiritin on BC. The cell viabilities were detected by CCK-8 assay. The levels of indicators of ferroptosis, oxidative stress, glycolysis, and inflammation were evaluated by commercial kits, flow cytometry, western blot, spectrophotometry, and ELISA assays. Mechanically, the expressions expression of the NF-κB pathway was determined by western blot.  In vivo  assay was also yielded on the BALB/c nude mice. Iso induced a concentration and time-dependent decrease of viability in both MDA-MB-231 and MCF-7 cells. Iso treatment significantly increased the levels of Fe 2+ , ROS, and MDA, and decreased the GSH level, and the relative protein expressions of GPX4 and xCT. Furthermore, Iso modulated oxidative stress, glycolysis, and inflammation through ferroptosis. In addition, Iso induced a concentration-dependent decrease in cell viability and a concentration-dependent increase in apoptosis rate in both MDA-MB-231/Dox and MCF-7/Dox cells. Iso notably counteracted the LPS-induced relative protein levels of p-p50/p50, p-p65/p65, and IκB, and the levels of ferroptosis, oxidative stress, glycolysis, and inflammation. The same results were also verified  in vivo . Iso inhibited the NF-κB signaling to regulate ferroptosis and improved Dox-resistance in breast cancer.

Isoliquiritin modulates ferroptosis via NF-κB signaling inhibition and alleviates doxorubicin resistance in breast cancer