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Mice lacking mitochondrial uncoupling protein are cold-sensitive but not obese
S Enerbäck1, A Jacobsson, E M Simpson
1The Jackson Laboratory, Bar Harbor, Maine 04609, USA.
Nature
|May 1, 1997
Summary
Mice lacking the mitochondrial uncoupling protein (UCP) showed defective thermoregulation but did not become obese. This suggests compensatory mechanisms, possibly involving UCP2, regulate body mass.
Area of Science:
- Biochemistry
- Metabolic Regulation
- Obesity Research
Background:
- Mitochondrial uncoupling protein (UCP) in brown adipose tissue generates heat by uncoupling oxidative phosphorylation.
- This thermogenesis is crucial for cold protection and energy balance regulation.
- Targeting thermogenesis is a potential strategy for combating obesity.
Purpose of the Study:
- To investigate the role of UCP in body mass regulation.
- To determine the effects of targeted gene inactivation of UCP on thermoregulation and obesity.
- To explore potential compensatory mechanisms in UCP-deficient mice.
Main Methods:
- Targeted inactivation of the gene encoding UCP in mice.
- Assessment of oxygen consumption following beta3-adrenergic-receptor agonist treatment.
- Evaluation of cold sensitivity and body mass changes on standard and high-fat diets.
Main Results:
- UCP-deficient mice exhibited reduced oxygen consumption and cold sensitivity, indicating impaired thermoregulation.
- Despite the deficiency, these mice did not develop hyperphagia or obesity on either diet.
- UCP2, a UCP homologue, was found to be ubiquitously expressed and induced in the brown fat of UCP-deficient mice.
Conclusions:
- The absence of UCP does not inherently lead to obesity in mice.
- Compensatory mechanisms, likely involving UCP2, may play a significant role in maintaining energy balance and body mass regulation.
- Further research into UCP2's function is warranted for understanding metabolic control and obesity treatment strategies.