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J. Biol. Chem., Vol. 275, Issue 21, 16251-16257, May 26, 2000
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From the Uncoupling protein-3 (UCP3) is a mitochondrial
protein that can diminish the mitochondrial membrane potential. Levels
of muscle Ucp3 mRNA are increased by thyroid hormone
and fasting. Ucp3 has been proposed to influence metabolic
efficiency and is a candidate obesity gene. We have produced a
Ucp3 knockout mouse to test these hypotheses. The
Ucp3 (
Lack of Obesity and Normal Response to Fasting and Thyroid
Hormone in Mice Lacking Uncoupling Protein-3*
§¶,
,
,
,
,
,
,
,
,
§§, and
§§
Diabetes Branch, NIDDK, National Institutes
of Health, Bethesda, Maryland 20892,
Department of Biochemistry,
Microbiology, and Immunology, University of Ottawa, Ottawa, Ontario K1H
8M5, Canada, ** Pennington Biomedical Research Center, Baton Rouge,
Louisiana 70808, and 
Mammalian Genetics
Section, Genetics of Development and Disease Branch, NIDDK,
National Institutes of Health, Bethesda, Maryland 20892
/
) mice had no detectable immunoreactive UCP3 by
Western blotting. In mitochondria from the knockout mice, proton leak
was greatly reduced in muscle, minimally reduced in brown fat, and not
reduced at all in liver. These data suggest that UCP3 accounts for much
of the proton leak in skeletal muscle. Despite the lack of UCP3, no
consistent phenotypic abnormality was observed. The knockout mice were
not obese and had normal serum insulin, triglyceride, and leptin
levels, with a tendency toward reduced free fatty acids and glucose.
Knockout mice showed a normal circadian rhythm in body temperature and
motor activity and had normal body temperature responses to fasting,
stress, thyroid hormone, and cold exposure. The base-line metabolic
rate and respiratory exchange ratio were the same in knockout and
control mice, as were the effects of fasting, a
3-adrenergic agonist (CL316243), and thyroid hormone on these parameters. The phenotype of
Ucp1/Ucp3 double knockout mice was indistinguishable from
Ucp1 single knockout mice. These data suggest that
Ucp3 is not a major determinant of metabolic rate but,
rather, has other functions.
*
The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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