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• W2078161791 abstract "We examined the role of melanocortin-4 receptors (MC4R) in proopiomelanocortin (Pomc) neurons in regulating metabolic and cardiovascular functions. Using Cre-loxP technology, we selectively rescued MC4R in Pomc neurons of mice with whole body MC4R deficiency (MC4R-Pomc-Cre mice). Body weight, food intake, and whole body oxygen consumption (V̇o 2 ) were determined daily, and blood pressure (BP), heart rate (HR), and body temperature were measured 24 h/day by telemetry. An intracerebroventricular cannula was placed in the right lateral ventricle for intracerebroventricular infusions. Littermate MC4R-deficient (LoxTB-MC4R) mice were used as controls. After control measurements, the MC4R antagonist (SHU-9119; 1 nmol/h) was infused intracerebroventricularly for 7 days. Compared with LoxTB-MC4R mice, MC4R-Pomc-Cre mice were less obese (47 ± 2 vs. 52 ± 2 g) and had increased energy expenditure (2,174 ± 98 vs. 1,990 ± 68 ml·kg −1 ·min −1 ), but food intake (4.4 ± 0.2 vs. 4.3 ± 0.3 g/day), BP (112 ± 1 vs. 109 ± 3 mmHg), and HR [557 ± 9 vs. 551 ± 14 beats per minute (bpm)] were similar between groups. Chronic SHU-9119 infusion increased food intake (4.2 ± 0.2 to 6.1 ± 0.5 g/day) and body weight (47 ± 2 to 52 ± 2 g) in MC4R-Pomc-Cre mice, while no changes were observed in LoxTB-MC4R mice. Chronic SHU-9119 infusion also increased BP and HR by 5 ± 1 mmHg and 60 ± 8 bpm in MC4R-Pomc-Cre mice without altering BP or HR in LoxTB-MC4R mice. These results indicate that MC4Rs in Pomc neurons are important for regulation of energy balance. In contrast, while activation of MC4R in Pomc neurons facilitates the BP response to acute stress, our data do not support a major role of MC4R in Pomc neurons in regulating baseline BP and HR." @default.
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• W2078161791 date "2013-08-15" @default.
• W2078161791 modified "2023-10-16" @default.
• W2078161791 title "Differential control of metabolic and cardiovascular functions by melanocortin-4 receptors in proopiomelanocortin neurons" @default.
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• W2078161791 doi "https://doi.org/10.1152/ajpregu.00518.2012" @default.
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