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2016 ; 8
(5
): 517-28
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Induced Disruption of the Iron-Regulatory Hormone Hepcidin Inhibits Acute
Inflammatory Hypoferraemia
#MMPMID27423740
Armitage AE
; Lim PJ
; Frost JN
; Pasricha SR
; Soilleux EJ
; Evans E
; Morovat A
; Santos A
; Diaz R
; Biggs D
; Davies B
; Gileadi U
; Robbins PA
; Lakhal-Littleton S
; Drakesmith H
J Innate Immun
2016[]; 8
(5
): 517-28
PMID27423740
show ga
Withdrawal of iron from serum (hypoferraemia) is a conserved innate immune
antimicrobial strategy that can withhold this critical nutrient from invading
pathogens, impairing their growth. Hepcidin (Hamp1) is the master regulator of
iron and its expression is induced by inflammation. Mice lacking Hamp1 from birth
rapidly accumulate iron and are susceptible to infection by blood-dwelling
siderophilic bacteria such as Vibrio vulnificus. In order to study the innate
immune role of hepcidin against a background of normal iron status, we developed
a transgenic mouse model of tamoxifen-sensitive conditional Hamp1 deletion
(termed iHamp1-KO mice). These mice attain adulthood with an iron status
indistinguishable from littermate controls. Hamp1 disruption and the consequent
decline of serum hepcidin concentrations occurred within hours of a single
tamoxifen dose. We found that the TLR ligands LPS and Pam3CSK4 and heat-killed
Brucella abortus caused an equivalent induction of inflammation in control and
iHamp1-KO mice. Pam3CSK4 and B. abortus only caused a drop in serum iron in
control mice, while hypoferraemia due to LPS was evident but substantially
blunted in iHamp1-KO mice. Our results characterise a powerful new model of
rapidly inducible hepcidin disruption, and demonstrate the critical contribution
of hepcidin to the hypoferraemia of inflammation.