Abstract:
:Iron metabolism is regulated by transcriptional and post-transcriptional mechanisms. The mRNA of the iron-controlling gene, transferrin receptor 1 (TfR1), has long been believed to be negatively regulated by a yet-unidentified endonuclease. Here, we show that the endonuclease Regnase-1 is critical for the degradation of mRNAs involved in iron metabolism in vivo. First, we demonstrate that Regnase-1 promotes TfR1 mRNA decay. Next, we show that Regnase-1-/- mice suffer from severe iron deficiency anemia, although hepcidin expression is downregulated. The iron deficiency anemia is induced by a defect in duodenal iron uptake. We reveal that duodenal Regnase-1 controls the expression of PHD3, which impairs duodenal iron uptake via HIF2α suppression. Finally, we show that Regnase-1 is a HIF2α-inducible gene and thus provides a positive feedback loop for HIF2α activation via PHD3. Collectively, these results demonstrate that Regnase-1-mediated regulation of iron-related transcripts is essential for the maintenance of iron homeostasis.
journal_name
Cell Repjournal_title
Cell reportsauthors
Yoshinaga M,Nakatsuka Y,Vandenbon A,Ori D,Uehata T,Tsujimura T,Suzuki Y,Mino T,Takeuchi Odoi
10.1016/j.celrep.2017.05.009subject
Has Abstractpub_date
2017-05-23 00:00:00pages
1614-1630issue
8issn
2211-1247pii
S2211-1247(17)30634-4journal_volume
19pub_type
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