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Abstract
High body iron levels are found in type 2 diabetes mellitus (DM). Iron excess leads to tissue injury through free radical formation. We investigated the effect of iron restriction on renal damage in Otsuka Long-Evans Tokushima Fatty (OLETF) rats, a model of type 2 DM. OLETF rats (n = 18) were divided into three groups at 10 weeks of age: high fat diet containing 8% NaCl (HFS, n = 6), HFS diet with iron restricted (HFS + IR, n = 6), and HFS with hydralazine (HFS + Hyd, n = 6). Long-Evans Tokushima (LETO) rats served as control. Iron restriction decreased hemoglobin levels, systolic blood pressure, and urinary excretion of protein and 8-hydroxy-2'-deoxyguanosine in the OLETF rats fed with HFS diet. Compared to the HFS group, the expression of desmin, renal glomerular injury marker and iron deposition in the renal tubules were attenuated in the HFS + IR group but not in the HFS + Hyd group at 26 weeks of age. Moreover, renal hypoxia (evaluated as pimonidazole adducts) was improved in the HFS + IR group compared to the HFS group in spite of anemia. Iron restriction prevented the production of reactive oxygen species and the development of early stage nephropathy in OLETF rats. Iron restriction may be beneficial in prevention of nephropathy in type 2 DM.
Acknowledgements
The authors are grateful to Noriko Kumon and Utako Kuze for their valuable assistance in the data management and for excellent technical assistance. We thank Dr Akari Furuse, Division of English, Hyogo College of Medicine, for critical reading of the manuscript. This study was supported by Grant-in-Aid for Scientific Research (C) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.