Cited by 111Mitochondrial Function and PathologyMetabolism, Diabetes, and CancerAutophagy in Disease and Therapy

Diabetes-induced up-regulation of uncoupling protein-2 results in increased mitochondrial uncoupling in kidney proximal tubular cells

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Friederich, Malou, Fasching, Angelica, Hansell, Peter, Nordquist, Lina, Palm, Fredrik·2008·Biochimica et Biophysica Acta (BBA) - Bioenergetics

Abstract

We have previously reported increased O(2) consumption unrelated to active transport by tubular cells and up-regulated mitochondrial uncoupling protein (UCP)-2 expressions in diabetic kidneys. It is presently unknown if the increased UCP-2 levels in the diabetic kidney results in mitochondrial uncoupling and increased O(2) consumption, which we therefore investigated in this study. The presence of UCP-2 in proximal tubular cells was confirmed by immunohistochemistry and found to be increased (western blot) in homogenized tissue and isolated mitochondria from kidney cortex of diabetic rats. Isolated proximal tubular cells had increased total and ouabain-insensitive O(2) consumption compared to controls. Isolated mitochondria from diabetic animals displayed increased glutamate-stimulated O(2) consumption (in the absence of ADP and during inhibition of the ATP-synthase by oligomycin) compared to controls. Guanosine diphosphate, an UCP inhibitor, and bovine serum albumin which removes fatty acids that are essential for UCP-2 uncoupling activity, independently prevented the increased glutamate-stimulated O(2) consumption in mitochondria from diabetic animals. In conclusion, diabetic rats have increased mitochondrial UCP-2 expression in renal proximal tubular cells, which results in mitochondrial uncoupling and increased O(2) consumption. This mechanism may be protective against diabetes-induced oxidative stress, but will increase O(2) usage. The subsequently reduced O(2) availability may contribute to diabetes-induced progressive kidney damage.

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Crossref · 10.1016/j.bbabio.2008.03.030

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Authors
Friederich, M., Fasching, A., Hansell, P., Nordquist, L., & Palm, F.
Affiliations
Uppsala University (SE)
Corresponding author
Palm, Fredrik
Venue
Biochimica et Biophysica Acta (BBA) - Bioenergetics
Publisher
Elsevier BV
Published
2008-07
Volume
1777
Issue
7-8
Pages
935-940
ISSN
0005-2728 (ISSN-L)
OpenAlex
W2084502320
Cited by
111
References
29
Citations by year
2026: 3 · 2025: 1 · 2024: 4 · 2023: 6 · 2022: 5 · 2021: 6 · 2020: 9 · 2019: 7 · 2018: 9 · 2017: 7 · 2016: 6 · 2015: 4 · 2014: 11 · 2013: 5 · 2012: 12
FWCI
2.20
Type
journal article
Language
en
Open access
Locations
  • Biochimica et Biophysica Acta (BBA) - Bioenergetics (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Fondation pour la Recherche Médicale
  • Svenska Sällskapet för Medicinsk Forskning
  • Stiftelsen Familjen Ernfors Fond
  • Marcus och Amalia Wallenbergs minnesfond
  • National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases (K99DK077858)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
UCP2, mitochondrial uncoupling, diabetes mellitus, diabetic kidney, proximal tubular epithelial cells, oxygen consumption, oxidative stress, kidney injury, guanosine diphosphate, fatty acids
MeSH terms
Uncoupling Protein 2, Animals, Diabetes Mellitus, Experimental, Hyperglycemia, Insulin, Ion Channels, Kidney Tubules, Proximal, Male, Mitochondria, Oxygen Consumption, Rats, Inbred WF, Up-Regulation, Mitochondrial Proteins, Rats

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