To investigate if the lower fat accumulation was caused by
increased energy expenditure in TNP-470–treated high-fat
diet-fed mice, we measured metabolic rates after 14-week
treatment. Indirect calorimetric analysis (O2 consumption)
showed no significant differences in basal resting metabolic
rate at 30°C in TNP-470–treated mice as compared with
controls (0.520.04 versus 0.610.06 mL O2/min per
mouse, respectively) (online Table I). Further, the metabolic
activity at rest during daytime at the habituated temperature
(23°C) was also not increased by TNP-470 treatment as compared with controls (0.830.06 versus 0.990.07 mL
O2/min per mouse, respectively), nor was the 1-hour total
metabolism at 23°C increased (online Table I). Thus there
were no detectable increases in energy expenditure in the
TNP-470–treated mice that might have contributed to the
reduction of body weight gain. Analyses of brown adipose
tissue capacity, such as noradrenaline-induced increase in
oxygen consumption and protein levels of uncoupling protein
(UCP)-1 in brown adipose tissue, also showed that no
increase in thermogenic capacity had been induced by TNP-
470 treatment (online Table I).
To investigate if the lower fat accumulation was caused byincreased energy expenditure in TNP-470–treated high-fatdiet-fed mice, we measured metabolic rates after 14-weektreatment. Indirect calorimetric analysis (O2 consumption)showed no significant differences in basal resting metabolicrate at 30°C in TNP-470–treated mice as compared withcontrols (0.520.04 versus 0.610.06 mL O2/min permouse, respectively) (online Table I). Further, the metabolicactivity at rest during daytime at the habituated temperature(23°C) was also not increased by TNP-470 treatment as compared with controls (0.830.06 versus 0.990.07 mLO2/min per mouse, respectively), nor was the 1-hour totalmetabolism at 23°C increased (online Table I). Thus therewere no detectable increases in energy expenditure in theTNP-470–treated mice that might have contributed to thereduction of body weight gain. Analyses of brown adiposetissue capacity, such as noradrenaline-induced increase inoxygen consumption and protein levels of uncoupling protein(UCP)-1 in brown adipose tissue, also showed that noincrease in thermogenic capacity had been induced by TNP-470 treatment (online Table I).
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