Modulation of glutathione peroxidase activity by age-dependent carbonylation in glomeruli of diabetic mice

Tanja Wiedenmann, Nadine Dietrich, Thomas Fleming, Sandro Altamura, Leo E. Deelman, Rob H. Henning, Martina U. Muckenthaler, Peter P. Nawroth, Hans-Peter Hammes, Andreas H. Wagner*, Markus Hecker

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

6 Citaten (Scopus)


Aims: Low levels of reactive oxygen species and resulting oxidative protein modifications may play a beneficial role in cellular function under stress conditions. Here we studied the influence of age-dependent protein carbonylation on expression and activity of the anti-oxidative selenoenzyme glutathione peroxidase(GPx) in insulin-deficient Ins2(Akita) mice and type 2 diabetic obese db/db mice in context of diabetic nephropathy.

Methods: Protein carbonylation, GPx expression and activity were examined in kidney tissue and lysates by common histological and protein biochemical methods.

Results: In kidneys of Ins2(Akita) mice, carbonylated proteins, GPx-1 and GPx-4 expression were mainly detected in podocytes and mesangial cells. GPx activity was increased in kidney cortex homogenates of these mice. Remarkably, young animals did not show a concomitant increase in GPx expression but enhanced GPx carbonylation. No carbonylation-dependent modification of GPx activity was detected in db/db mice. In cultured podocytes hyperglycemia induced an increase in GPx expression but had no effect on activity or carbonylation. In kidney tissue sections of type 1 or type 2 diabetes patients, GPx-1 and GPx-4 expression but not overall protein carbonylation was significantly decreased.

Conclusions: These results indicate the existence of a threshold for beneficial carbonylation-dependent redox signaling during the progression of diabetic nephropathy. (C) 2017 Elsevier Inc. All rights reserved.

Originele taal-2English
Pagina's (van-tot)130-138
Aantal pagina's9
Nummer van het tijdschrift2
StatusPublished - feb-2018

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