Cited by 64Adipose Tissue and MetabolismMitochondrial Function and PathologyMetabolism, Diabetes, and Cancer

Long-term high-fat feeding induces greater fat storage in mice lacking UCP3

Costford, Sheila R., Chaudhry, Shehla N., Crawford, Sean A., Salkhordeh, Mahmoud, Harper, Mary-Ellen·2008·American Journal of Physiology-Endocrinology and Metabolism

Abstract

Uncoupling protein-3 (UCP3) is a mitochondrial inner-membrane protein highly expressed in skeletal muscle. While UCP3's function is still unknown, it has been hypothesized to act as a fatty acid (FA) anion exporter, protecting mitochondria against lipid peroxidation and/or facilitating FA oxidation. The aim of this study was to determine the effects of long-term feeding of a 45% fat diet on whole body indicators of muscle metabolism in congenic C57BL/6 mice that were either lacking UCP3 ( Ucp3−/−) or had a transgenically induced approximately twofold increase in UCP3 levels ( UCP3tg). Mice were fed the high-fat (HF) diet for a period of either 4 or 8 mo immediately following weaning. After long-term HF feeding, UCP3tg mice weighed an average of 15% less than wild-type mice ( P < 0.05) and were 20% less metabolically efficient than both wild-type and Ucp3−/− mice ( P < 0.01). Additionally, wild-type mice had 21% lower, whereas UCP3tg mice had 36% lower, levels of adiposity compared with Ucp3−/− mice ( P < 0.05 and P < 0.001, respectively), indicating a protective effect of UCP3 against fat gain. No differences in whole body oxygen consumption were detected following long-term HF feeding. Glucose and insulin tolerance tests revealed that both the UCP3tg and Ucp3−/− mice were more glucose tolerant and insulin sensitive compared with wild-type mice after short-term HF feeding, but this protection was not maintained in the long term. Findings indicate that UCP3 is involved in protection from fat gain induced by long-term HF feeding, but not in protection from insulin resistance.

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Crossref · 10.1152/ajpendo.00779.2007

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Authors
Costford, S. R., Chaudhry, S. N., Crawford, S. A., Salkhordeh, M., & Harper, M.-E.
Affiliations
University of Ottawa (CA)
Venue
American Journal of Physiology-Endocrinology and Metabolism
Published
2008-11
Volume
295
Issue
5
Pages
E1018-E1024
ISSN
  • 0193-1849 (ISSN-L)
  • 1522-1555
OpenAlex
W2086501334
Cited by
64
References
40
Citations by year
2025: 1 · 2024: 2 · 2023: 2 · 2022: 4 · 2021: 1 · 2020: 3 · 2019: 4 · 2018: 2 · 2017: 2 · 2016: 8 · 2015: 2 · 2014: 1 · 2013: 7 · 2012: 3
FWCI
4.98
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Endocrinology and Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • 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
Keywords
UCP3, high-fat diet, fat deposition, adiposity, skeletal muscle metabolism, fatty acid oxidation, mitochondrial lipid peroxidation, insulin resistance, glucose tolerance, metabolic efficiency, oxygen consumption
MeSH terms
Uncoupling Protein 3, Animals, Animal Structures, Blood Glucose, Body Weight, Dietary Fats, Eating, Energy Metabolism, Epididymis, Glucose Tolerance Test, Insulin Resistance, Ion Channels, Male, Mice, Inbred C57BL, Mice, Transgenic, Mitochondria, Organ Size, Oxygen Consumption, Time Factors, Mice, Knockout, Muscle, Skeletal, Mitochondrial Proteins, Mice, Adipose Tissue, White

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