Mitochondria-Targeted Titanium Complex Exerts Potent Anticancer Activity by Disturbing Iron Homeostasis.

Triple-negative breast cancer (TNBC) is an aggressive malignancy, with limited targeted treatment options. In this study, we developed a novel triphenylphosphine (TPP)-modified deferasirox (DFX) titanium complex (Ti-DFX-TPP) to disrupt iron homeostasis in TNBC cells through transmetalation. Ti-DFX-TPP depletes the labile iron pool, triggering a compensatory upregulation of transferrin receptor 1 (TfR1) in response to an intracellular iron deficiency. The disruption of iron metabolism by Ti-DFX-TPP increases reactive oxygen species (ROS) levels, which in turn lead to mitochondrial dysfunction and DNA damage, ultimately inhibiting cancer cell growth. In vivo studies further demonstrated that Ti-DFX-TPP inhibits tumor growth without significant toxicity to major organs. These findings suggest that Ti-DFX-TPP is a promising therapeutic candidate for TNBC, as it exploits the disruption of iron metabolism and ROS pathways to enhance its anticancer efficacy.