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J. Biol. Chem., Vol. 275, Issue 21, 16258-16266, May 26, 2000
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From the Uncoupling protein 3 (UCP3) is a member of the
mitochondrial anion carrier superfamily. Based upon its high homology
with UCP1 and its restricted tissue distribution to skeletal muscle and
brown adipose tissue, UCP3 has been suggested to play important roles
in regulating energy expenditure, body weight, and thermoregulation. Other postulated roles for UCP3 include regulation of fatty acid metabolism, adaptive responses to acute exercise and starvation, and
prevention of reactive oxygen species (ROS) formation. To address these
questions, we have generated mice lacking UCP3 (UCP3 knockout (KO)
mice). Here, we provide evidence that skeletal muscle mitochondria
lacking UCP3 are more coupled (i.e. increased state 3/state
4 ratio), indicating that UCP3 has uncoupling activity. In addition,
production of ROS is increased in mitochondria lacking UCP3. This study
demonstrates that UCP3 has uncoupling activity and that its absence may
lead to increased production of ROS. Despite these effects on
mitochondrial function, UCP3 does not seem to be required for body
weight regulation, exercise tolerance, fatty acid oxidation, or
cold-induced thermogenesis. The absence of such phenotypes in UCP3 KO
mice could not be attributed to up-regulation of other UCP mRNAs.
However, alternative compensatory mechanisms cannot be excluded. The
consequence of increased mitochondrial coupling in UCP3 KO mice on
metabolism and the possible role of yet unidentified compensatory
mechanisms, remains to be determined.
Energy Metabolism in Uncoupling Protein 3 Gene Knockout Mice*
§,
,
,
,
,
,
,
,
,
, and
**
Division of Endocrinology, Department of
Medicine, Beth Israel Deaconess Medical Center and Harvard Medical
School, Boston, Massachusetts 02215,
Departments of Exercise and
Sports Science Physiology and Biochemistry, School of Medicine, East
Carolina University, Greenville, North Carolina 27858, and
¶ Diabetes and Metabolism Unit, Boston Medical Center,
Boston, Massachusetts 02118
*
This work was supported by National Institutes of Health
Grant DK49569 (to B. B. L.), a grant from Lilly (to B. B. L.),
Boston Obesity Nutrition Research Center (BONRC) Pilot Project Award P30 DK46200 (to A. V.-P.), BONRC Transgenic Core Grant P30 DK46200, and Human Frontier Science Program Grant LT 0020/1999 (to O. B.).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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