Mice lacking the thyroid hormone receptor-alpha gene spend more energy in thermogenesis, burn more fat, and are less sensitive to high-fat diet-induced obesity

Endocrinology
Paula PelletierJ Enrique Silva

Abstract

Unable to activate brown adipose tissue (BAT) thermogenesis, alphaT3-receptor-deficient mice (Thra-0/0) are cold intolerant. Our objective was to investigate the impact on energy economy and mechanisms of the alternate facultative thermogenesis developed. Energy expenditure (oxygen and food consumption) is elevated in Thra-0/0 mice reared at room temperature. Such difference disappears at thermoneutrality (30 C) and expands as ambient temperature becomes colder (P < 0.001). Despite eating more, Thra-0/0 are leaner than wild-type (WT) mice (P < 0.01), whereas these, whether on chow or high-fat diet, gained more weight (g/d: 0.12 +/- 0.002 vs. 0.08 +/- 0.002 and 0.25 +/- 0.005 vs. 0.17 +/- 0.005, respectively) and adiposity than Thra-0/0 mice (P < 0.001). The respiratory quotient was lower in Thra-0/0 than WT mice (P < 0.001), after feeding or fasted, on chow or high-fat diet, indicating a preference for fat as fuel, which was associated with increased lipoprotein lipase (LPL) expression in skeletal muscle of Thra-0/0 mice but with no differences in gene expression in white adipose tissue. Type-2 deiodinase (D2) was increased in BAT and aerobic muscle of Thra-0/0 mice. This and liver D1 were increased by a high-fat diet in both g...Continue Reading

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Citations

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