Unimpaired thermogenic response to noradrenaline in genetic (ob/ob) and hypothalamic (MSG) obese mice.
The thermogenic response to noradrenaline administration was investigated at 25 degrees C in two models of obese mice (genetic ob/ob obesity of the ' QEC ' strain and monosodium-glutamate-induced obesity) and in their respective lean littermates. Subcutaneous injections of a low dose of noradrenaline (100 micrograms/kg body wt.) elevated metabolic rate by about 30% in both obese models but not in their respective lean counterparts. In contrast, the increase in metabolic rate after injections of a high dose of noradrenaline (600 micrograms/kg body wt.) was of a similar magnitude in both lean and obese animals: metabolic rate was increased by 70-80%. These results indicate that the overall whole body thermogenic capacity is unimpaired at room temperature in this ' QEC ' strain of ob/ob mice and in the hypothalamic damaged obese mice. Obesity in these models is therefore not associated with a reduced ability to respond to noradrenaline but could rather be due to a failure to release noradrenaline.
D000818:Animals; D001833:Body Temperature Regulation / Q000187:drug effects*; D007031:Hypothalamus / Q000187:drug effects / Q000503:physiopathology; D008297:Male; D051379:Mice; D008820:Mice, Obese; D009638:Norepinephrine / Q000494:pharmacology*; D009765:Obesity / Q000139:chemically induced / Q000235:genetics / Q000503:physiopathology*; D010101:Oxygen Consumption / Q000187:drug effects; D012970:Sodium Glutamate
D012970:Sodium Glutamate; D009638:Norepinephrine