Abstract:
:Growth differentiation factor 15 (GDF15) is a divergent member of the transforming growth factor-beta superfamily and has been identified in different contexts as a hypoxia-inducible gene product and as a molecule involved in hepcidin regulation. The biology of iron and oxygen is closely related, and known regulatory pathways involving hypoxia-inducible factor (HIF) and iron-regulatory proteins (IRPs) are responsive to both these stimuli. We therefore sought to characterize the regulation of GDF15 by iron and oxygen and to define the involvement or otherwise of HIF and IRP pathways. Here we show that GDF15 is strongly up-regulated by stimuli that deplete cells of iron and that this response is specifically antagonized by the reprovision of iron. GDF15 exhibits greater sensitivity to iron depletion than hypoxia, and responses to hypoxia and iron depletion are independent of HIF and IRP activation, suggesting a novel mechanism of regulation. We also report significant induction of serum GDF15 in iron-deficient subjects and after administration of an iron chelator to normal subjects. These findings indicate that GDF15 can be induced by pathophysiologic changes in iron availability, raising important questions about the mechanism of regulation and its role in iron homeostasis.
journal_name
Bloodjournal_title
Bloodauthors
Lakhal S,Talbot NP,Crosby A,Stoepker C,Townsend AR,Robbins PA,Pugh CW,Ratcliffe PJ,Mole DRdoi
10.1182/blood-2008-07-170431subject
Has Abstractpub_date
2009-02-12 00:00:00pages
1555-63issue
7eissn
0006-4971issn
1528-0020pii
blood-2008-07-170431journal_volume
113pub_type
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