糖尿病誘発性慢性腎疾患モデル動物―尿細管障害バイオマーカーによる検討―

Diabetes-induced chronic kidney disease（ DCKD） is a serious health problem. Therefore, modalities for preventing/improving DCKD are required. The aim of this study was to establish an animal model of DCKD. Four five-week-old male OLETF and LETO rats were used as experimental and control animals, respectively. After both rats were raised 17 months, collections of urine, blood and bilateral kidneys were performed. Urinary biomarkers for renal proximal tubule injury, monocyte chemoattractant protein-1（ MCP-1） and kidney injury molecule-1（ KIM-1）, were measured by the Bio-Plex system. OLETF rats showed a significant increase in blood glucose, Hb A1c, creatinine, blood urea nitrogen（ BUN）, kidney/body weight ratio, glomerular area, 24 h-urine volume, urinary protein concentrations, MCP-1 and KIM-1 compared with LETO rats. There was a positive correlation not only between BUN and MCP-1 or KIM-1 but also between urinary protein concentrations and MCP-1 or KIM-1. These results indicate that the present OLETF rats have both glomerular and proximal tubular injury. Thus, the aged male OLETF rats with long-term diabetes may become a potent animal model for examining effects of exercise/dietary therapies on DCKD