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Deletion of Uncoupling Protein-2 reduces renal mitochondrial leak respiration, intrarenal hypoxia and proteinuria in a mouse model of type 1 diabetes
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Cell Biology, Integrative Physiology.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Cell Biology, Integrative Physiology.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Cell Biology, Integrative Physiology.ORCID iD: 0000-0002-0315-8554
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Cell Biology, Integrative Physiology.
2018 (English)In: Acta Physiologica, ISSN 1748-1708, E-ISSN 1748-1716, Vol. 223, no 4, article id e13058Article in journal (Refereed) Published
Abstract [en]

AimUncoupling protein-2 (UCP-2) can induce mitochondrial uncoupling in the diabetic kidney. Although mitochondrial uncoupling reduces oxidative stress originating from the mitochondria and can be regarded as a protective mechanism, the increased oxygen consumption occurring secondarily to increased mitochondria uncoupling, that is leak respiration, may contribute to kidney tissue hypoxia. Using UCP-2(-/-) mice, we tested the hypothesis that UCP-2-mediated leak respiration is important for the development of diabetes-induced intrarenal hypoxia and proteinuria. MethodsKidney function, invivo oxygen metabolism, urinary protein leakage and mitochondrial function were determined in wild-type and UCP-2(-/-) mice during normoglycaemia and 2weeks after diabetes induction. ResultsDiabetic wild-type mice displayed mitochondrial leak respiration, pronounced intrarenal hypoxia, proteinuria and increased urinary KIM-1 excretion. However, diabetic UCP-2(-/-) mice did not develop increased mitochondrial leak respiration and presented with normal intrarenal oxygen levels, urinary protein and KIM-1 excretion. ConclusionAlthough functioning as an antioxidant system, mitochondria uncoupling is always in co-occurrence with increased oxygen consumption, that is leak respiration; a potentially detrimental side effect as it can result in kidney tissue hypoxia; an acknowledged unifying pathway to nephropathy. Indeed, this study demonstrates a novel mechanism in which UCP-2-mediated mitochondrial leak respiration is necessary for the development of diabetes-induced intrarenal tissue hypoxia and proteinuria.

Place, publisher, year, edition, pages
WILEY , 2018. Vol. 223, no 4, article id e13058
Keywords [en]
diabetic nephropathy, kidney, kidney injury molecule-1, mitochondria, oxygen consumption
National Category
Physiology
Identifiers
URN: urn:nbn:se:uu:diva-361674DOI: 10.1111/apha.13058ISI: 000438491300002PubMedID: 29480974OAI: oai:DiVA.org:uu-361674DiVA, id: diva2:1254060
Funder
Swedish Heart Lung FoundationSwedish Diabetes AssociationAvailable from: 2018-10-08 Created: 2018-10-08 Last updated: 2018-10-08Bibliographically approved

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Friederich, MalouPersson, PatrikHansell, PeterPalm, Fredrik

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