학술논문
GTP Cyclohydrolase 1/Tetrahydrobiopterin Counteract Ferroptosis through Lipid Remodeling
Document Type
Article
Author
Kraft, Vanessa A. N.; Bezjian, Carla T.; Pfeiffer, Susanne; Ringelstetter, Larissa; Müller, Constanze; Zandkarimi, Fereshteh; Merl-Pham, Juliane; Bao, Xuanwen; Anastasov, Natasa; Kössl, Johanna; Brandner, Stefanie; Daniels, Jacob D.; Schmitt-Kopplin, Philippe; Hauck, Stefanie M.; Stockwell, Brent R.; Hadian, Kamyar; Schick, Joel A.
Source
ACS Central Science; January 2020, Vol. 6 Issue: 1 p41-53, 13p
Subject
Language
ISSN
23747943; 23747951
Abstract
Ferroptosis is an iron-dependent form of regulated cell death linking iron, lipid, and glutathione levels to degenerative processes and tumor suppression. By performing a genome-wide activation screen, we identified a cohort of genes antagonizing ferroptotic cell death, including GTP cyclohydrolase-1 (GCH1) and its metabolic derivatives tetrahydrobiopterin/dihydrobiopterin (BH4/BH2). Synthesis of BH4/BH2by GCH1-expressing cells caused lipid remodeling, suppressing ferroptosis by selectively preventing depletion of phospholipids with two polyunsaturated fatty acyl tails. GCH1 expression level in cancer cell lines stratified susceptibility to ferroptosis, in accordance with its expression in human tumor samples. The GCH1-BH4-phospholipid axis acts as a master regulator of ferroptosis resistance, controlling endogenous production of the antioxidant BH4, abundance of CoQ10, and peroxidation of unusual phospholipids with two polyunsaturated fatty acyl tails. This demonstrates a unique mechanism of ferroptosis protection that is independent of the GPX4/glutathione system.