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2014 ; 123
(14
): 2261-8
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The type I BMP receptor Alk3 is required for the induction of hepatic hepcidin
gene expression by interleukin-6
#MMPMID24501215
Mayeur C
; Lohmeyer LK
; Leyton P
; Kao SM
; Pappas AE
; Kolodziej SA
; Spagnolli E
; Yu B
; Galdos RL
; Yu PB
; Peterson RT
; Bloch DB
; Bloch KD
; Steinbicker AU
Blood
2014[Apr]; 123
(14
): 2261-8
PMID24501215
show ga
Increased IL-6 production induces, via STAT3 phosphorylation, hepatic
transcription of the gene encoding the iron-regulatory hormone, hepcidin, leading
to development of anemia of chronic disease (ACD). Inhibition of bone
morphogenetic protein (BMP) signaling prevents the induction of hepcidin gene
expression by IL-6 and ameliorates ACD. Using mice with hepatocyte-specific
deficiency of Alk2 or Alk3, we sought to identify the BMP type I receptor that
participates in IL-6-mediated induction of hepcidin gene expression. Mice were
injected with adenovirus specifying IL-6 (Ad.IL-6) or control adenovirus.
Seventy-two hours later, serum iron concentrations and hepatic levels of STAT3
phosphorylation and hepcidin messenger RNA were measured. Additional mice were
injected with recombinant murine IL-6 (mIL-6) or vehicle, and hepatic hepcidin
gene expression was measured 4 hours later. Deficiency of Alk2 or Alk3 did not
alter the ability of Ad.IL-6 injection to induce hepatic STAT3 phosphorylation.
Ad.IL-6 increased hepatic hepcidin messenger RNA levels and decreased serum iron
concentrations in Alk2- but not Alk3-deficient mice. Similarly, administration of
mIL-6 induced hepatic hepcidin gene expression in Alk2- but not Alk3-deficient
mice. These results demonstrate that the ability of IL-6 to induce hepatic
hepcidin gene expression and reduce serum iron concentrations is dependent on the
BMP type I receptor Alk3.
|*Gene Expression Regulation
[MESH]
|Animals
[MESH]
|Bone Morphogenetic Protein Receptors, Type I/genetics/*physiology
[MESH]