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Temporal increases in urinary carboxymethyllysine correlate with albuminuria development in diabetes.
- Source :
-
American journal of nephrology [Am J Nephrol] 2011; Vol. 34 (1), pp. 9-17. Date of Electronic Publication: 2011 Jun 06. - Publication Year :
- 2011
-
Abstract
- Background/aims: Advanced glycation end products (AGEs) mediate progressive tissue damage in diabetic nephropathy; however, their utility as a noninvasive reliable biomarker of progressive diabetic nephropathy remains to be determined. In this study, we investigated the temporal accumulation of the AGE carboxymethyllysine (CML) at various sites in a model of experimental diabetic nephropathy.<br />Methods: Diabetic rats were followed for 1, 4, 8, 16 and 32 weeks. Glomerular filtration rate and urinary albumin excretion were measured. CML was determined in the plasma, urine, renal cortical mitochondria and cytosol by an in-house ELISA. Gene expression of AGE receptors were quantified by real-time PCR and urinary excretion of 8-hydroxy-2'-deoxyguanosine (8-OHdG) was determined by EIA.<br />Results: Four weeks after diabetes induction, urinary CML excretion was increased, which preceded the excretion of urinary albumin and continued to rise progressively until 32 weeks. Circulating, mitochondrial and cytosolic CML content and urinary excretion of 8-OHdG were increased 4 weeks after diabetes induction, but did not increase further with diabetes duration. Renal gene expression of AGE receptors was transiently upregulated at 1 week of diabetes, but this was not a sustained phenomenon.<br />Conclusions: The most informative marker of progressive renal damage linked to the AGE pathway in experimental diabetic nephropathy is urinary excretion of CML, which now warrants clinical investigation as a potential noninvasive sensitive marker of progressive diabetic nephropathy.<br /> (Copyright © 2011 S. Karger AG, Basel.)
- Subjects :
- 8-Hydroxy-2'-Deoxyguanosine
Albuminuria urine
Animals
Biomarkers blood
Biomarkers urine
Cytosol metabolism
Deoxyguanosine analogs & derivatives
Deoxyguanosine urine
Diabetes Mellitus, Experimental metabolism
Diabetes Mellitus, Type 1 chemically induced
Diabetic Nephropathies genetics
Diabetic Nephropathies urine
Gene Expression
Glomerular Filtration Rate
Glycation End Products, Advanced urine
Lysine metabolism
Lysine urine
Male
RNA, Messenger metabolism
Rats
Rats, Sprague-Dawley
Receptor for Advanced Glycation End Products
Receptors, Immunologic metabolism
Streptozocin
Time Factors
Diabetes Mellitus, Type 1 metabolism
Diabetic Nephropathies metabolism
Glycation End Products, Advanced metabolism
Kidney Cortex metabolism
Lysine analogs & derivatives
Mitochondria metabolism
Receptors, Immunologic genetics
Subjects
Details
- Language :
- English
- ISSN :
- 1421-9670
- Volume :
- 34
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- American journal of nephrology
- Publication Type :
- Academic Journal
- Accession number :
- 21654162
- Full Text :
- https://doi.org/10.1159/000328581