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pubmed-article:18026094pubmed:abstractTextBone morphogenetic protein (BMP) signals coordinate developmental patterning and have essential physiological roles in mature organisms. Here we describe the first known small-molecule inhibitor of BMP signaling-dorsomorphin, which we identified in a screen for compounds that perturb dorsoventral axis formation in zebrafish. We found that dorsomorphin selectively inhibits the BMP type I receptors ALK2, ALK3 and ALK6 and thus blocks BMP-mediated SMAD1/5/8 phosphorylation, target gene transcription and osteogenic differentiation. Using dorsomorphin, we examined the role of BMP signaling in iron homeostasis. In vitro, dorsomorphin inhibited BMP-, hemojuvelin- and interleukin 6-stimulated expression of the systemic iron regulator hepcidin, which suggests that BMP receptors regulate hepcidin induction by all of these stimuli. In vivo, systemic challenge with iron rapidly induced SMAD1/5/8 phosphorylation and hepcidin expression in the liver, whereas treatment with dorsomorphin blocked SMAD1/5/8 phosphorylation, normalized hepcidin expression and increased serum iron levels. These findings suggest an essential physiological role for hepatic BMP signaling in iron-hepcidin homeostasis.lld:pubmed
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pubmed-article:18026094pubmed:authorpubmed-author:DengDonna YDYlld:pubmed
pubmed-article:18026094pubmed:authorpubmed-author:BlochKenneth...lld:pubmed
pubmed-article:18026094pubmed:authorpubmed-author:Sachidanandan...lld:pubmed
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pubmed-article:18026094pubmed:authorpubmed-author:YuPaul BPBlld:pubmed
pubmed-article:18026094pubmed:authorpubmed-author:HongCharles...lld:pubmed
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