Journal article
Polymorphisms of the UCP2 gene are associated with glomerular filtration rate in type 2 diabetic patients and with decreased UCP2 gene expression in human kidney
PLoS One, Vol.10(7), e0132938
2015
Abstract
Introduction Uncoupling protein 2 (UCP2) reduces production of reactive oxygen species (ROS) by mitochondria. ROS overproduction is one of the major contributors to the pathogenesis of chronic diabetic complications, such as diabetic kidney disease (DKD). Thus, deleterious polymorphisms in the UCP2 gene are candidate risk factors for DKD. In this study, we investigated whether UCP2 -866G/A, Ala55Val and Ins/Del polymorphisms were associated with DKD in patients with type 2 diabetes mellitus (T2DM), and whether they had an effect on UCP2 gene expression in human kidney tissue biopsies. Materials and Methods In a case-control study, frequencies of the UCP2 -866G/A, Ala55Val and Ins/Del polymorphisms as well as frequencies of the haplotypes constituted by them were analyzed in 287 T2DM patients with DKD and 281 T2DM patients without this complication. In a cross-sectional study, UCP2 gene expression was evaluated in 42 kidney biopsy samples stratified according to the presence of the UCP2 mutated -866A/55Val/Ins haplotype. Results In the T2DM group, multivariate logistic regression analysis showed that the -866A/55Val/ Ins haplotype was an independent risk factor for DKD (OR = 2.136, 95% CI 1.036-4.404), although neither genotype nor allele frequencies of the individual polymorphisms differed between case and control groups. Interestingly, T2DM patients carrying the mutated haplotype showed decreased estimated glomerular filtration rate (eGFR) when compared to subjects with the reference haplotype (adjusted P= 0.035). In kidney biopsy samples, UCP2expression was significantly decreased in UCP2 mutated haplotype carriers when compared to kidneys from patients with the reference haplotype (0.32±1.20 vs. 1.85±1.16 n fold change; adjusted P< 0.000001). Discussion Data reported here suggest that the UCP2 -866A/55Val/Ins haplotype is associated with an increased risk for DKD and with a lower eGFR in T2DM patients. Furthermore, this mutated haplotype was associated with decreased UCP2 gene expression in human kidneys.
Details
- Title
- Polymorphisms of the UCP2 gene are associated with glomerular filtration rate in type 2 diabetic patients and with decreased UCP2 gene expression in human kidney
- Authors
- B M De Souza (Author) - Hospital de Clínicas de Porto Alegre, BrazilM Michels (Author) - Hospital de Clínicas de Porto Alegre, BrazilD A Sortica (Author) - Hospital de Clínicas de Porto Alegre, BrazilA P Bouças (Author) - Hospital de Clínicas de Porto Alegre, BrazilJ Rheinheimer (Author) - Hospital de Clínicas de Porto Alegre, BrazilM P Buffon (Author) - Hospital de Clínicas de Porto Alegre, BrazilA C Bauer (Author) - Hospital de Clínicas de Porto Alegre, BrazilL H Canani (Author) - Hospital de Clínicas de Porto Alegre, BrazilD Crispim (Author) - Hospital de Clínicas de Porto Alegre, Brazil
- Publication details
- PLoS One, Vol.10(7), e0132938
- Publisher
- Public Library of Science
- Date published
- 2015
- DOI
- 10.1371/journal.pone.0132938
- ISSN
- 1932-6203
- Copyright note
- Copyright © 2015 Souza et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
- Organisation Unit
- University of the Sunshine Coast, Queensland; Thompson Institute
- Language
- English
- Record Identifier
- 99451365202621
- Output Type
- Journal article
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- Domestic collaboration
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- Endocrinology & Metabolism
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