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• W2038872854 startingPage "542" @default.
• W2038872854 abstract "Leptin plays an important role in regulation of body weight through regulation of food intake and sympathetically mediated thermogenesis. The hypothalamic melanocortin system, via activation of the melanocortin-4 receptor (MC4-R), decreases appetite and weight, but its effects on sympathetic nerve activity (SNA) are unknown. In addition, it is not known whether sympathoactivation to leptin is mediated by the melanocortin system. We tested the interactions between these systems in regulation of brown adipose tissue (BAT) and renal and lumbar SNA in anesthetized Sprague-Dawley rats. Intracerebroventricular administration of the MC4-R agonist MT-II (200 to 600 pmol) produced a dose-dependent sympathoexcitation affecting BAT and renal and lumbar beds. This response was completely blocked by the MC4-R antagonist SHU9119 (30 pmol ICV). Administration of leptin (1000 microg/kg IV) slowly increased BAT SNA (baseline, 41+/-6 spikes/s; 6 hours, 196+/-28 spikes/s; P=0.001) and renal SNA (baseline, 116+/-16 spikes/s; 6 hours, 169+/-26 spikes/s; P=0.014). Intracerebroventricular administration of SHU9119 did not inhibit leptin-induced BAT sympathoexcitation (baseline, 35+/-7 spikes/s; 6 hours, 158+/-34 spikes/s; P=0.71 versus leptin alone). However, renal sympathoexcitation to leptin was completely blocked by SHU9119 (baseline, 142+/-17 spikes/s; 6 hours, 146+/-25 spikes/s; P=0.007 versus leptin alone). This study demonstrates that the hypothalamic melanocortin system can act to increase sympathetic nerve traffic to thermogenic BAT and other tissues. Our data also suggest that leptin increases renal SNA through activation of hypothalamic melanocortin receptors. In contrast, sympathoactivation to thermogenic BAT by leptin appears to be independent of the melanocortin system." @default.
• W2038872854 created "2016-06-24" @default.
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• W2038872854 date "1999-01-01" @default.
• W2038872854 modified "2023-10-11" @default.
• W2038872854 title "Interactions Between the Melanocortin System and Leptin in Control of Sympathetic Nerve Traffic" @default.
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• W2038872854 doi "https://doi.org/10.1161/01.hyp.33.1.542" @default.
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