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• W2010996864 abstract "The fatty Zucker rat has impaired heat production and fails to mount an adequate thermogenic response to cold exposure, partly because of decreased sympathetic drive to thermogenesis in brown adipose tissue. Neuropeptide Y, synthesized in neurons of the hypothalamic arcuate nucleus and released in the paraventricular nucleus, stimulates feeding and inhibits brown adipose tissue activity. The neuropeptide Y neurons are overactive in fatty Zucker rats and are thought to contribute to hyperphagia, reduced energy expenditure and obesity. We have examined the relationship between thermogenic activity in brown adipose tissue (measured as uncoupling protein messenger RNA levels) and hypothalamic neuropeptide Y and neuropeptide Y messenger RNA levels in response to cold exposure (4 degrees C) for 2.5 and 18 h, in fatty and lean Zucker rats. In lean Zucker rats, cold exposure at 4 degrees C for 2.5 and 18 h significantly increased uncoupling protein messenger RNA levels by 3.5-fold (P<0.01) and 3.3-fold (P<0.01), respectively, compared with warm-maintained controls. Exposure to cold for 18 h also increased neuropeptide Y concentrations in the paraventricular nucleus (P<0.01) and ventromedial nucleus (P<0.001) in lean rats, with no change in neuropeptide Y messenger RNA after either 2.5 or 18 h. By contrast, fatty Zucker rats showed no significant changes in uncoupling protein messenger RNA (P>0.05) at either duration of cold exposure. There were also no significant changes in neuropeptide Y levels in any region nor in neuropeptide Y messenger RNA, with cold exposure for either period (P>0.05). In lean rats, cold exposure therefore stimulates brown fat uncoupling protein messenger RNA and also increases neuropeptide Y concentrations in its hypothalamic sites of release. We suggest that increased brown fat thermogenic capacity induced by cold in lean rats may be mediated, at least in part, by decreased neuropeptide Y release in the paraventricular nucleus, resulting in its accumulation in this site. Defective thermogenic responses in fatty rats may result from central dysregulation of brown adipose tissue due to sustained and non-suppressible overactivity of hypothalamic neuropeptide Y neurons." @default.
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• W2010996864 date "1997-06-01" @default.
• W2010996864 modified "2023-09-27" @default.
• W2010996864 title "Role of hypothalamic neuropeptide Y neurons in the defective thermogenic response to acute cold exposure in fatty Zucker rats" @default.
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• W2010996864 doi "https://doi.org/10.1016/s0306-4522(97)00121-8" @default.
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