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2017 ; 7
(1
): 10621
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Dietary iron restriction alleviates renal tubulointerstitial injury induced by
protein overload in mice
#MMPMID28878231
Ikeda Y
; Horinouchi Y
; Hamano H
; Hirayama T
; Kishi S
; Izawa-Ishizawa Y
; Imanishi M
; Zamami Y
; Takechi K
; Miyamoto L
; Ishizawa K
; Aihara KI
; Nagasawa H
; Tsuchiya K
; Tamaki T
Sci Rep
2017[Sep]; 7
(1
): 10621
PMID28878231
show ga
Increased proteinuria causes tubulointerstitial injury due to inflammation in
chronic kidney disease (CKD). Iron restriction exhibits protective effects
against renal dysfunction; however, its effects against protein overload-induced
tubulointerstitial damage remain unclear. Here, we investigated dietary iron
restriction effect on tubulointerstitial damage in mice with protein-overload
tubulointerstitial injury. Renal tubulointerstitial injury in animal model was
induced by intraperitoneal injection of an overdose of bovine serum albumin
(BSA). We divided mice into three groups: normal saline?+?normal diet (ND),
BSA?+?ND, and BSA?+?iron-restricted diet (IRD). BSA overload induced renal
tubulointerstitial injury in the ND mice, which was ameliorated in the IRD mice.
Inflammatory cytokines and extracellular matrix mRNA expression was upregulated
in BSA?+?ND mice kidneys and was inhibited by IRD. BSA-induced increase in renal
superoxide production, NADPH oxidase activity, and p22(phox) expression was
diminished in the IRD mice. IRD suppression increased BSA-induced renal
macrophage infiltration. Moreover, BSA mice exhibited nucleotide-binding
oligomerisation domain-like receptor pyrin domain-containing protein (NLRP)
inflammasome activation, which was inhibited by IRD. Ferrous iron increased in
kidneys with BSA overload and was inhibited by IRD. Thus, iron restriction
inhibited oxidative stress and inflammatory changes, contributing to the
protective effect against BSA overload-induced tubulointerstitial injury.