Dietary Iron Modulates Glucose and Lipid Homeostasis in Diabetic Mice.
Biol Trace Elem Res. 2019 May;189(1):194-200.
doi: 10.1007/s12011-018-1446-3. Epub 2018 Jul 19.
Ma W1,2,3, Feng Y4, Jia L1,2,3, Li S1,2,3, Li J1,2,3, Wang Z1,2,3, Chen X1,2,3, Du H5,6,7.

Abstract
Imbalance of iron homeostasis has been involved in clinical courses of metabolic diseases such as type 2 diabetes mellitus, obesity, and nonalcoholic fatty liver, through mechanisms not yet fully elucidated. Herein, we evaluated the effect of dietary
iron on the development of diabetic syndromes in genetically obese db/db mice. Mice (aged 7 weeks) were fed with high-iron (HI) diets (1000 mg/kg chow) or low-iron (LI) diets (12 mg/kg) for 9 weeks. HI diets increased hepatic iron threefold and led to
fourfold higher mRNA levels of hepcidin. HI also induced a 60% increase in fasting glucose due to insulin resistance, as confirmed by decreased hepatic glycogen deposition eightfold and a 21% decrease of serum adiponectin level. HI-fed mice had lower
visceral adipose tissue mass estimated by epididymal and inguinal fat pad, associated with iron accumulation and smaller size of adipocytes. Gene expression analysis of liver showed that HI diet upregulated gluconeogenesis and downregulated lipogenesis.
These results suggested that excess dietary iron leads to reduced mass, increased fasting glucose, decreased adiponectin level, and enhancement of insulin resistance, which indicated a multifactorial role of excess iron in the development of diabetes in
the setting of obesity.

KEYWORDS:
Diabetic mice; Dietary iron; Glycolipid metabolism; Obesity; Type 2 diabetes mellitus

PMID: 30027366 DOI: 10.1007/s12011-018-1446-3


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