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• W2076168302 abstract "Proopiomelanocortin (POMC) is posttranslationally processed to several peptides including α-MSH, a primary regulator of energy balance that inhibits food intake and stimulates energy expenditure. However, another POMC-derived peptide, β-endorphin (β-EP), has been shown to stimulate food intake. In this study we examined the effects of intracerebroventricular (icv) β-EP on food intake and its ability to antagonize the negative effects of α-MSH on energy balance in male rats. A single icv injection of β-EP stimulated food intake over a 2- to 6-h period during both the light and dark cycles. This effect was, however, not sustained with chronic icv β-EP infusion. In the next study, a subthreshold dose of β-EP was injected together with Nle4, d-Phe7 (NDP)-MSH after a 16-h fast, and the negative effects of NDP-MSH on refeeding and body weight gain were partially reversed. Finally, peptide interactions were studied in a chronic icv infusion model. Weight gain and food intake were significantly suppressed in the NDP-MSH group during the entire study. A subthreshold dose of β-EP antagonized these suppressive effects on food intake and weight gain for the first 3 d. However on d 4–7, β-EP no longer blocked these effects. Of note, the stimulatory effect of β-EP on feeding and its ability to antagonize MSH were specific for β-EP1–31 and were not observed with β-EP1–27. This study highlights the importance of understanding how the balance between α-MSH and β-EP is maintained and the potential role of differential POMC processing in regulating energy balance." @default.
• W2076168302 created "2016-06-24" @default.
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• W2076168302 date "2012-09-01" @default.
• W2076168302 modified "2023-10-16" @default.
• W2076168302 title "β-Endorphin Antagonizes the Effects of α-MSH on Food Intake and Body Weight" @default.
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• W2076168302 doi "https://doi.org/10.1210/en.2012-1166" @default.
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