mTOR regulates cellular iron homeostasis through tristetraprolin.
mTOR regulates cellular iron homeostasis through tristetraprolin.
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DOI:
10.1016/j.cmet.2012.10.001
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发表时间:
2012-11-07
期刊:
影响因子:
29
通讯作者:
Ardehali H
中科院分区:
文献类型:
--
作者:
Bayeva M;Khechaduri A;Puig S;Chang HC;Patial S;Blackshear PJ;Ardehali H
Iron is an essential cofactor with unique redox properties. Iron regulatory proteins 1 and 2 (IRP1/2) have been established as important regulators of cellular iron homeostasis, but little is known about the role of other pathways in this process. Here we report that the mammalian target of rapamycin (mTOR) regulates iron homeostasis by modulating transferrin receptor 1 (TfR1) stability and altering cellular iron flux. Mechanistic studies identify tristetraprolin (TTP), a protein involved in anti-inflammatory response, as the downstream target of mTOR that binds to and enhances degradation of TfR1 mRNA. We also show that TTP is strongly induced by iron chelation, promotes downregulation of iron-requiring genes in both mammalian and yeast cells, and modulates survival in low-iron states. Taken together, our data uncover a link between metabolic, inflammatory, and iron regulatory pathways, and point towards the existence of a yeast-like TTP-mediated iron conservation program in mammals.
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