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J Biol Chem. 2019 Nov 18. pii: jbc.RA119.009548. doi: 10.1074/jbc.RA119.009548. [Epub ahead of print]

Ferroptosis is controlled by the coordinated transcriptional regulation of glutathione and labile iron metabolism by the transcription factor BACH1.

Author information

1
Department of Biochemistry, Tohoku University School of Medicine, Japan.
2
Tohoku University School of Medicine, Japan.
3
Tohoku Medical Megabank Organization.
4
Tohoku University School of Medicine.

Abstract

Ferroptosis is an iron-dependent programmed cell death event, whose regulation and physiological significance remain to be elucidated. Analyzing transcriptional responses of mouse embryonic fibroblasts exposed to the ferroptosis inducer erastin, here we found that a set of genes related to oxidative stress protection is induced upon ferroptosis. We considered that up-regulation of these genes attenuates ferroptosis induction and found that the transcription factor BTB domain and CNC homolog 1 (BACH1), a regulator in heme and iron metabolism, promotes ferroptosis by repressing the transcription of a subset of the erastin-induced protective genes. We noted that these genes are involved in the synthesis of glutathione or metabolism of intracellular labile iron and include glutamate-cysteine ligase modifier subunit (Gclm), solute carrier family 7 member 11 (Slc7a11), ferritin heavy chain 1 (Fth1), ferritin light chain 1 (Ftl1), and solute carrier family 40 member 1 (Slc40a1). Ferroptosis has also been previously shown to induce cardiomyopathy, and here we observed that Bach1-/- mice are more resistant to myocardial infarction than wild-type mice and that the severity of ischemic injury is decreased by the iron-chelator deferasirox, which suppressed ferroptosis. Our findings suggest that ferroptosis is regulated at the transcriptional level by BACH1, represses genes that combat labile iron-induced oxidative stress, and is stimulated by BACH1 upon disruption of the balance between the transcriptional induction of protective genes and accumulation of iron-mediated damage. We propose that BACH1 controls the threshold of ferroptosis induction and may represent a therapeutic target for alleviating ferroptosis-related diseases, including myocardial infarction.

KEYWORDS:

(BTB domain and CNC homolog 1) BACH1; cardiovascular disease; cell death; ferroptosis; glutathione peroxidase; iron; iron sequestration; ischemia; myocardial infarction; transcription repressor

PMID:
31740582
DOI:
10.1074/jbc.RA119.009548
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