作者
Raphaël Rodriguez,Tatiana Cañeque,Leeroy Baron,Sebastian Müller,Alanis Carmona,Ludovic Colombeau,Antoine Versini,Marie Sabatier,Júlio L. Sampaio,Eikan Mishima,Armel Picard–Bernes,Stéphanie Solier,Jiashuo Zheng,Bettina Proneth,Leishemba K. Thoidingjam,Christine Gaillet,Laurence Grimaud,Colin Fraser,Krystina Szylo,Caroline Bonnet,Emmanuelle Charafe,Christophe Ginestier,Patricia Santofimia,Nelson Dusetti,Juan Iovanna,A. Sá Cunha,Gabriella Pittau,Pascal Hammel,Dimitri Tzanis,Sylvie Bonvalot,Sarah Watson,Brent R. Stockwell,Marcus Conrad,Jessalyn M. Ubellacker
摘要
Abstract Iron catalyses the oxidation of lipids in biological membranes and promotes a form of cell death referred to as ferroptosis 1-3 . Identifying where this chemistry takes place in the cell can inform the design of drugs capable of inducing or inhibiting ferroptosis in various disease-relevant settings. Whereas genetic approaches have revealed underlying mechanisms of lipid peroxide detoxification 1,4,5 , small molecules can provide unparalleled spatiotemporal control of the chemistry at work 6 . Here, we show that the ferroptosis inhibitor liproxstatin-1 (Lip-1) exerts a protective activity by inactivating iron in lysosomes. Based on this, we designed the bifunctional compound fentomycin that targets phospholipids at the plasma membrane and activates iron in lysosomes upon endocytosis, promoting oxidative degradation of phospholipids and ferroptosis. Fentomycin effectively kills primary sarcoma and pancreatic ductal adenocarcinoma cells. It acts as a lipolysis-targeting chimera (LIPTAC), preferentially targeting iron-rich CD44 high cell-subpopulations 7,8 associated with the metastatic disease and drug resistance 9,10 . Furthermore, we demonstrate that fentomycin also depletes CD44 high cells in vivo and reduces intranodal tumour growth in an immunocompetent murine model of breast cancer metastasis. These data demonstrate that lysosomal iron triggers ferroptosis and that lysosomal iron redox chemistry can be exploited for therapeutic benefits.