To reassess the accumulation of advanced glycation end products in diabetic renal cortex, we used a newly developed enzyme-linked immunosorbent assay to measure AGEs in renal cortex from STZ-induced diabetic and age-matched control rats. Kidneys and aortas were obtained from rats after 5 and 20 wk of STZ injection. At 5 wk of diabetes, the mean AGE content in collagenase-digested materials of renal cortex was > 16-fold higher in diabetic animals compared with controls (1044.4 ± 151.8 vs. 64.3 ± 5.7 arbitrary units, P < 0.01). At 20 wk of diabetes, it was > 45-fold higher in diabetic compared with control animals (3841.0 ± 1077.3 vs. 83.8 ± 12.8 AUs, P < 0.01). These increases were surprisingly large compared with the < 1.5-fold increase in the fluorescence levels both after 5 and 20 wk of diabetes. In control animals, neither the AGE content nor the fluorescence level increased during this period. Moreover, at 20 wk of diabetes, the AGE content was 39-fold higher in renal cortex compared with aorta. This study provided the first immunochemical evidence that collagenase-digested materials of renal cortex, as well as aorta, contained AGE products and that these products were present in much higher levels in diabetic animals than in control animals. With duration of diabetes, the AGE contents increased significantly both in renal cortex and aorta. The excessive accumulation of AGEs was most apparent in the diabetic kidney. These findings suggest that the actual level of AGEs, in particular, in diabetic renal cortex is much higher than previously anticipated, and a newly developed enzyme-linked immunosorbent assay may be a powerful tool for investigating the role of the advanced Maillard reaction in the development of diabetic nephropathy.
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Original Articles|
June 01 1993
Immunochemical Detection of Advanced Glycation End Products in Renal Cortex From STZ-Induced Diabetic Rat Free
Tomoko Mitsuhashi;
Tomoko Mitsuhashi
Department of Internal Medicine, Hokkaido University School of Medicine
Sapporo, Japan
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Hidetaka Nakayama;
Hidetaka Nakayama
Department of Internal Medicine, Hokkaido University School of Medicine
Sapporo, Japan
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Tomohiro Itoh;
Tomohiro Itoh
Department of Internal Medicine, Hokkaido University School of Medicine
Sapporo, Japan
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Satoru Kuwajima;
Satoru Kuwajima
Department of Internal Medicine, Hokkaido University School of Medicine
Sapporo, Japan
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Shin Aoki;
Shin Aoki
Department of Internal Medicine, Hokkaido University School of Medicine
Sapporo, Japan
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Toshiya Atsumi;
Toshiya Atsumi
Department of Internal Medicine, Hokkaido University School of Medicine
Sapporo, Japan
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Takao Koike
Takao Koike
Department of Internal Medicine, Hokkaido University School of Medicine
Sapporo, Japan
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Address correspondence and reprint requests to Dr. Hidetaka Nakayama, The 2nd Department of Internal Medicine, Hokkaido University School of Medicine, Sapporo 060, Japan.
Diabetes 1993;42(6):826–832
Article history
Received:
July 27 1992
Revision Received:
January 21 1993
Accepted:
January 21 1993
PubMed:
8495806
Citation
Tomoko Mitsuhashi, Hidetaka Nakayama, Tomohiro Itoh, Satoru Kuwajima, Shin Aoki, Toshiya Atsumi, Takao Koike; Immunochemical Detection of Advanced Glycation End Products in Renal Cortex From STZ-Induced Diabetic Rat. Diabetes 1 June 1993; 42 (6): 826–832. https://doi.org/10.2337/diab.42.6.826
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