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Ferredoxin reductase is critical for p53-dependent tumor suppression via iron regulatory protein 2.

Abstract：

:Ferredoxin reductase (FDXR), a target of p53, modulates p53-dependent apoptosis and is necessary for steroidogenesis and biogenesis of iron-sulfur clusters. To determine the biological function of FDXR, we generated a Fdxr-deficient mouse model and found that loss of Fdxr led to embryonic lethality potentially due to iron overload in developing embryos. Interestingly, mice heterozygous in Fdxr had a short life span and were prone to spontaneous tumors and liver abnormalities, including steatosis, hepatitis, and hepatocellular carcinoma. We also found that FDXR was necessary for mitochondrial iron homeostasis and proper expression of several master regulators of iron metabolism, including iron regulatory protein 2 (IRP2). Surprisingly, we found that p53 mRNA translation was suppressed by FDXR deficiency via IRP2. Moreover, we found that the signal from FDXR to iron homeostasis and the p53 pathway was transduced by ferredoxin 2, a substrate of FDXR. Finally, we found that p53 played a role in iron homeostasis and was required for FDXR-mediated iron metabolism. Together, we conclude that FDXR and p53 are mutually regulated and that the FDXR-p53 loop is critical for tumor suppression via iron homeostasis.

journal_name

Genes Dev

journal_title

Genes & development

authors

Zhang Y,Qian Y,Zhang J,Yan W,Jung YS,Chen M,Huang E,Lloyd K,Duan Y,Wang J,Liu G,Chen X

doi

10.1101/gad.299388.117

subject

Has Abstract

pub_date

2017-06-15 00:00:00

pages

1243-1256

issue

12

eissn

0890-9369

issn

1549-5477

pii

gad.299388.117

journal_volume

31

pub_type

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