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Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
CISD1 inhibits ferroptosis by protection against mitochondrial lipid peroxidation.
Biochemical and Biophysical Research Communications 2016 September 17
Ferroptosis is a form of non-apoptotic cell death originally identified in cancer cells. However, the key regulator of ferroptosis in mitochondria remains unknown. Here, we show that CDGSH iron sulfur domain 1 (CISD1, also termed mitoNEET), an iron-containing outer mitochondrial membrane protein, negatively regulates ferroptotic cancer cell death. The classical ferroptosis inducer erastin promotes CISD1 expression in an iron-dependent manner in human hepatocellular carcinoma cells (e.g., HepG2 and Hep3B). Genetic inhibition of CISD1 increased iron-mediated intramitochondrial lipid peroxidation, which contributes to erastin-induced ferroptosis. In contrast, stabilization of the iron sulfur cluster of CISD1 by pioglitazone inhibits mitochondrial iron uptake, lipid peroxidation, and subsequent ferroptosis. These findings indicate a novel role of CISD1 in protecting against mitochondrial injury in ferroptosis.
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