Oncostatin M is a potent inducer of hepcidin, the iron regulatory hormone

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
Bomee ChungSophie Vaulont

Abstract

Erythropoietic activity is known to affect iron homeostasis through regulation of the liver iron regulatory hormone hepcidin. To identify new factors secreted by the erythroblasts that could influence hepcidin synthesis, we set up a coculture model. HuH7 hepatoma cells cocultured with primary human erythroblasts or erythroleukemic UT7 cells presented a 20- to 35-fold increase of hepcidin gene expression. This induction was fully blunted in the presence of a neutralizing oncostatin M antibody, demonstrating that this cytokine, belonging to the IL-6 family of cytokines, was responsible for increased levels of hepcidin expression. We further demonstrated that recombinant oncostatin M induced a dramatic transcriptional increase of hepcidin in HuH7 cells through specific activation of the STAT pathway. Hepcidin induction by oncostatin M was also observed in hepatocytes in primary culture and is believed to be cell specific since no induction was found in isolated bone marrow cells, macrophagic, stromal, and lymphoma-derived cell lines, nor in erythroblasts. Finally, we show that oncostatin M administration in vivo increases hepcidin expression and leads to significantly decreased serum iron levels. This work identifies a new potent ...Continue Reading

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