Role of the Ferroportin Iron-Responsive Element in Iron and Nitric Oxide Dependent Gene Regulation

doi:10.1006/bcmd.2002.0572

Blood Cells, Molecules, and Diseases

Volume 29, Issue 3, November 2002, Pages 315-326

https://doi.org/10.1006/bcmd.2002.0572 Get rights and content

Abstract

ABSTRACT

The newly described iron transporter, ferroportin (MTP1, IREG1), is expressed in a variety of tissues including the duodenum and cells of the mononuclear phagocyte system (MPS). In the MPS, ferroportin is hypothesized to be a major exporter of iron scavenged from senescent erythrocytes. Changes in iron metabolism, including the sequestration of iron in the MPS, are characteristic of both acute and chronic inflammation and these conditions induce changes in ferroportin expression. In a mouse model of acute inflammation, LPS administration is associated with reduced MPS ferroportin protein and mRNA expression. In addition, the ferroportin 5′ UTR also has an iron-responsive element that binds to the iron-response proteins, but whether there is a role for this IRE in inflammation induced regulation of ferroportin has been unclear. A luciferase reporter gene under the control of the mouse ferroportin promoter and 5′ UTR was used to determine if this 5′ UTR conferred IRE-dependent regulation on this reporter gene. Stimulation of reporter gene transfected RAW 264.7 cells (a mouse macrophage cell line) with LPS resulted in IRE-dependent inhibition of luciferase production. Inhibitors of nitric oxide synthase abrogated the IRE-dependent effect of LPS. In addition, direct treatment of RAW 264.7 and with NO donor S-nitroso-N-acetylpenicillamine resulted in IRE-dependent down-regulation of luciferase expression. The effect of NO was consistent with IRP1/IRE mediated translation block. There are most likely both inflammation-mediated transcriptional and post-transcriptional (IRE-dependent) mechanisms for inhibiting ferroportin expression in MPS cells.

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^☆: Communicated by E. Beutler, M.D., 10/14/02

^f1: Correspondence and reprint requests to: David J. Haile, UT Health Science Center, 7703 Floyd Curl Drive, San Antonio, TX 78229. Fax 210-567-1956. Email: [email protected].

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Regular ArticleRole of the Ferroportin Iron-Responsive Element in Iron and Nitric Oxide Dependent Gene Regulation☆

Abstract

Kidney Int. Suppl.

Kidney Int. Suppl.

Microbes Infect.

Curr. Opin. Microbiol.

J. Biol. Chem.

Blood

Blood

J. Biol. Chem.

J. Biol. Chem.

Blood

Mol. Cell.

J. Biol. Chem.

Blood

Blood

J. Biol. Chem.

J. Biol. Chem.

Iron, infections, and anemia of inflammation

Clin. Infect. Dis.

Advances in the anemia of chronic disease

Int. J. Hematol.

Anemia of chronic disorders in systemic autoimmune diseases

Haematologica

Infection with Mycobacterium avium differentially regulates the expression of iron transport protein mRNA in murine peritoneal macrophages

Infect. Immun.

Natural resistance to infection with intracellular pathogens: the Nramp1 protein is recruited to the membrane of the phagosome

J. Exp. Med.

Regulation of iron metabolism in the acute-phase response: interferon gamma and tumour necrosis factor alpha induce hypoferraemia, ferritin production and a decrease in circulating transferrin receptors in cancer patients

Eur. J. Clin. Invest.

Regular Article
Role of the Ferroportin Iron-Responsive Element in Iron and Nitric Oxide Dependent Gene Regulation☆