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Erschienen in: Diabetologia 1/2014

01.01.2014 | Article

Glyoxalase-1 overexpression reduces endothelial dysfunction and attenuates early renal impairment in a rat model of diabetes

verfasst von: Olaf Brouwers, Petra M. G. Niessen, Toshio Miyata, Jakob A. Østergaard, Allan Flyvbjerg, Carine J. Peutz-Kootstra, Jonas Sieber, Peter H. Mundel, Michael Brownlee, Ben J. A. Janssen, Jo G. R. De Mey, Coen D. A. Stehouwer, Casper G. Schalkwijk

Erschienen in: Diabetologia | Ausgabe 1/2014

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Abstract

Aims/hypothesis

In diabetes, advanced glycation end-products (AGEs) and the AGE precursor methylglyoxal (MGO) are associated with endothelial dysfunction and the development of microvascular complications. In this study we used a rat model of diabetes, in which rats transgenically overexpressed the MGO-detoxifying enzyme glyoxalase-I (GLO-I), to determine the impact of intracellular glycation on vascular function and the development of early renal changes in diabetes.

Methods

Wild-type and Glo1-overexpressing rats were rendered diabetic for a period of 24 weeks by intravenous injection of streptozotocin. Mesenteric arteries were isolated to study ex vivo vascular reactivity with a wire myograph and kidneys were processed for histological examination. Glycation was determined by mass spectrometry and immunohistochemistry. Markers for inflammation, endothelium dysfunction and renal dysfunction were measured with ELISA-based techniques.

Results

Diabetes-induced formation of AGEs in mesenteric arteries and endothelial dysfunction were reduced by Glo1 overexpression. Despite the absence of advanced nephrotic lesions, early markers of renal dysfunction (i.e. increased glomerular volume, decreased podocyte number and diabetes-induced elevation of urinary markers albumin, osteopontin, kidney-inflammation-molecule-1 and nephrin) were attenuated by Glo1 overexpression. In line with this, downregulation of Glo1 in cultured endothelial cells resulted in increased expression of inflammation and endothelium dysfunction markers. In fully differentiated cultured podocytes incubation with MGO resulted in apoptosis.

Conclusions/interpretation

This study shows that effective regulation of the GLO-I enzyme is important in the prevention of vascular intracellular glycation, endothelial dysfunction and early renal impairment in experimental diabetes. Modulating the GLO-I pathway therefore may provide a novel approach to prevent vascular complications in diabetes.
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Metadaten
Titel
Glyoxalase-1 overexpression reduces endothelial dysfunction and attenuates early renal impairment in a rat model of diabetes
verfasst von
Olaf Brouwers
Petra M. G. Niessen
Toshio Miyata
Jakob A. Østergaard
Allan Flyvbjerg
Carine J. Peutz-Kootstra
Jonas Sieber
Peter H. Mundel
Michael Brownlee
Ben J. A. Janssen
Jo G. R. De Mey
Coen D. A. Stehouwer
Casper G. Schalkwijk
Publikationsdatum
01.01.2014
Verlag
Springer Berlin Heidelberg
Erschienen in
Diabetologia / Ausgabe 1/2014
Print ISSN: 0012-186X
Elektronische ISSN: 1432-0428
DOI
https://doi.org/10.1007/s00125-013-3088-5

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