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Growth hormone receptor deficiency results in blunted ghrelin feeding response, obesity, and hypolipidemia in mice.

Journal article
Authors Emil Egecioglu
Mikael Bjursell
Anna Ljungberg
Suzanne L. Dickson
John J Kopchick
Göran Bergström
Lennart Svensson
Jan Oscarsson
Jan Törnell
Mohammad Bohlooly-Yeganeh
Published in American journal of physiology. Endocrinology and metabolism
Volume 290
Issue 2
Pages E317-25
ISSN 0193-1849
Publication year 2006
Published at Institute of Neuroscience and Physiology, Department of Physiology
Institute of Medicine, Department of Molecular and Clinical Medicine
Pages E317-25
Language en
Links dx.doi.org/10.1152/ajpendo.00181.20...
Keywords Animals, Body Weight, drug effects, Feeding Behavior, drug effects, Female, Hypolipoproteinemias, chemically induced, physiopathology, Injections, Male, Mice, Mice, Knockout, Obesity, chemically induced, physiopathology, Peptide Hormones, administration & dosage, Receptors, Somatotropin, deficiency
Subject categories Physiology

Abstract

We have previously shown that growth hormone (GH) overexpression in the brain increased food intake, accompanied with increased hypothalamic agouti-related protein (AgRP) expression. Ghrelin, which stimulates both appetite and GH secretion, was injected intracerebroventricularly to GHR-/- and littermate control (+/+) mice to determine whether ghrelin's acute effects on appetite are dependent on GHR signaling. GHR-/- mice were also analyzed with respect to serum levels of lipoproteins, apolipoprotein (apo)B, leptin, glucose, and insulin as well as body composition. Central injection of ghrelin into the third dorsal ventricle increased food consumption in +/+ mice, whereas no change was observed in GHR-/- mice. After ghrelin injection, AgRP mRNA expression in the hypothalamus was higher in +/+ littermates than in GHR-/- mice, indicating a possible importance of AgRP in the GHR-mediated effect of ghrelin. Compared with controls, GHR-/- mice had increased food intake, leptin levels, and total and intra-abdominal fat mass per body weight and deceased lean mass. Moreover, serum levels of triglycerides, LDL and HDL cholesterol, and apoB, as well as glucose and insulin levels were lower in the GHR-/- mice. In summary, ghrelin's acute central action to increase food intake requires functionally intact GHR signaling. Long-term GHR deficiency in mice is associated with high plasma leptin levels, obesity, and increased food intake but a marked decrease in all lipoprotein fractions.

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