Visible light-activatable platinum(iv) prodrugs harnessing CD36 for ovarian cancer therapy

We hereby engineered photoactivatable Pt(iv) metallodrugs that harness CD36 to target ovarian cancer cells. Pt(iv) compounds mimic the structure of fatty acids and take advantage of CD36 as a "Trojan horse" to gain entry into the cells. We confirmed that CD36-dependent entry occurs using graphite furnace atomic absorption spectroscopy with ovarian cancer cells expressing different levels of CD36 and a CD36 inhibitor, SSO. Once the Pt(iv) metallodrugs enter the cancer cells, they can be activated to form Pt(ii) with characteristics of cisplatin under visible light (490 nm) irradiation, promoting photoinduced electron transfer from the attached fluorophore to the metal center. This light-induced activation can increase the cytotoxicity of the Pt(iv) metallodrugs by up to 20 times toward ovarian cancer cells, inducing DNA damage and enabling efficient elimination of drug-resistant cancer cells.