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1Department of Physiology, Göteborg University, Gothenburg; 2AstraZeneca Research and Development, Molndal; 3Wallenberg Laboratory, Göteborg University, Gothenburg, Sweden; and 4Edison Biotechnology Institute and Department of Biomedical Sciences, Ohio University, Athens, Ohio
Submitted 27 April 2005 ; accepted in final form 14 September 2005
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.
agouti-related protein; appetite regulation; intracerebroventriclar injection
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