Cited by 85Adipose Tissue and MetabolismMitochondrial Function and PathologyMetabolism, Diabetes, and Cancer

Human Uncoupling Protein‐3 and Obesity: An Update

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Hesselink, Matthijs K.C., Mensink, Marco, Schrauwen, Patrick·2003·Obesity Research

Abstract

The cloning of the uncoupling protein (UCP)1 homologs UCP2 and UCP3 has raised considerable interest in the mechanism. The expression of UCP3 mainly in skeletal muscle mitochondria and the potency of the skeletal muscle as a thermogenic organ made UCP3 an attractive target for studies toward manipulation of energy expenditure to fight disorders such as obesity and type 2 diabetes. Overexpressing UCP3 in mice resulted in lean, hyperphagic mice. However, the lack of an apparent phenotype in mice lacking UCP3 triggered the search for alternative functions of UCP3. The observation that fatty acid levels significantly affect UCP3 expression has given UCP3 a position in fatty acid handling and/or oxidation. Emerging data indicate that the primary physiological role of UCP3 may be the mitochondrial handling of fatty acids rather than the regulation of energy expenditure through thermogenesis. It has been proposed that UCP3 functions to export fatty acid anions away from the mitochondrial matrix. In doing so, fatty acids are exchanged with protons, explaining the uncoupling activity of UCP3. The exported fatty acid anions may originate from hydrolysis of fatty acid esters by a mitochondrial thioesterase, or they may have entered the mitochondria as nonesterified fatty acids by incorporating into and flip‐flopping across the mitochondrial inner membrane. Regardless of the origin of the fatty acid anions, this putative function of UCP3 might be of great importance in protecting mitochondria against fatty acid accumulation and may help to maintain muscular fat oxidative capacity.

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  1. Jucker BM, Dufour S, Ren J, et al. Assessment of mito- chondrial energy coupling in vivo by 13C/31P NMR. Proc Natl Acad Sci U S A. 2000;97:6880 -4.
  2. Dalgaard LT, Hansen T, Urhammer SA, Drivsholm T, Borch-Johnsen K, Pedersen O. The uncoupling protein 3-55 C 3 T variant is not associated with type II diabetes mellitus in Danish subjects. Diabetologia. 2001;44:1065-7.
  3. Russell AP, Schrauwen P, Somm E, et al. Decreased fatty acid ␤-oxidation in riboflavin-responsive multiple acylCoA dehydrogenase deficient patients is associated with an increase in UCP3. J Clin Endocrinol Metab. 2003. (in press).

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Authors
Hesselink, M. K. C., Mensink, M., & Schrauwen, P.
Affiliations
Maastricht University (NL)
Corresponding author
Hesselink, Matthijs K.C.
Venue
Obesity Research
Publisher
Wiley
Published
2003-12
Volume
11
Issue
12
Pages
1429-1443
ISSN
  • 1071-7323 (ISSN-L)
  • 1550-8528
OpenAlex
W2023262549
Cited by
85
References
98
Citations by year
2026: 1 · 2025: 2 · 2024: 5 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 2 · 2019: 3 · 2017: 4 · 2016: 2 · 2014: 4 · 2013: 5 · 2012: 6
FWCI
0.98
Type
journal article
Language
en
Open access
Locations
  • Obesity Research (publishedVersion)
  • PubMed (publishedVersion)
  • Research Publications (Maastricht University) (publishedVersion, other-oa)
  • Socio-Environmental Systems Modeling (acceptedVersion)
  • Research Publications (Maastricht University) (submittedVersion, other-oa)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
Funders
Koninklijke Nederlandse Akademie van Wetenschappen
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, obesity, skeletal muscle mitochondria, fatty acid oxidation, thermogenesis, energy expenditure, type 2 diabetes
MeSH terms
Uncoupling Protein 3, Animals, Carrier Proteins, Energy Metabolism, Fatty Acids, Humans, Ion Channels, Mitochondria, Muscle, Obesity, Oxidative Phosphorylation, Mitochondrial Proteins, Mice

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