The Serine Protease Matriptase-2 (TMPRSS6) Inhibits Hepcidin Activation by Cleaving Membrane Hemojuvelin

Overview

Journal Cell Metab

Publisher Cell Press

Specialties Cell Biology
Endocrinology

Date 2008 Nov 4

PMID 18976966

Citations 236

Authors

Laura Silvestri

Alessia Pagani

Antonella Nai

Ivana De Domenico

Jerry Kaplan

Clara Camaschella

Affiliations

Soon will be listed here.

Abstract

The liver peptide hepcidin regulates body iron, is upregulated in iron overload and inflammation, and is downregulated in iron deficiency/hypoxia. The transmembrane serine protease matriptase-2 (TMPRSS6) inhibits the hepcidin response and its mutational inactivation causes iron-deficient anemia in mice and humans. Here we confirm the inhibitory effect of matriptase-2 on hepcidin promoter; we show that matriptase-2 lacking the serine protease domain, identified in the anemic Mask mouse (matriptase-2(MASK)), is fully inactive and that mutant R774C found in patients with genetic iron deficiency has decreased inhibitory activity. Matriptase-2 cleaves hemojuvelin (HJV), a regulator of hepcidin, on plasma membrane; matriptase-2(MASK) shows no cleavage activity and the human mutant only partial cleavage capacity. Matriptase-2 interacts with HJV through the ectodomain since the interaction is conserved in matriptase-2(MASK). The expression of matriptase-2 mutants in zebrafish results in anemia, confirming the matriptase-2 role in iron metabolism and its interaction with HJV.

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