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2012 ; 25
(1
): 115-24
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Effect of dietary iron deficiency and overload on the expression of ZIP metal-ion
transporters in rat liver
#MMPMID21826460
Nam H
; Knutson MD
Biometals
2012[Feb]; 25
(1
): 115-24
PMID21826460
show ga
The mammalian ZIP (Zrt-, Irt-like Protein) family of transmembrane transport
proteins consists of 14 members that share considerable homology. ZIP proteins
have been shown to mediate the cellular uptake of the essential trace elements
zinc, iron, and manganese. The aim of the present study was to determine the
effect of dietary iron deficiency and overload on the expression of all 14 ZIP
transporters in the liver, the main site of iron storage. Weanling male rats
(n = 6/group) were fed iron-deficient (FeD), iron-adequate (FeA), or
iron-overloaded (FeO) diets in two independent feeding studies. In study 1, diets
were based on the TestDiet 5755 formulation and contained iron at 9 ppm (FeD),
215 ppm (FeA), and 27,974 ppm (3% FeO). In study 2, diets were based on the
AIN-93G formulation and contained iron at 9 ppm Fe (FeD), 50 ppm Fe (FeA), or
18916 ppm (2% FeO). After 3 weeks, the FeD diets depleted liver non-heme iron
stores and induced anemia, whereas FeO diets resulted in hepatic iron overload.
Quantitative RT-PCR revealed that ZIP5 mRNA levels were 3- and 8-fold higher in
2% FeO and 3% FeO livers, respectively, compared with FeA controls. In both
studies, a consistent downregulation of ZIP6, ZIP7, and ZIP10 was also observed
in FeO liver relative to FeA controls. Studies in H4IIE hepatoma cells further
documented that iron loading affects the expression of these ZIP transporters.
Overall, our data suggest that ZIP5, ZIP6, ZIP7, and ZIP10 are regulated by iron,
indicating that they may play a role in hepatic iron/metal homeostasis during
iron deficiency and overload.
|*Iron Deficiencies
[MESH]
|Animals
[MESH]
|Cation Transport Proteins/genetics/*metabolism
[MESH]