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Antibodies raised against different extracellular loops of the melanocortin-3 receptor affect energy balance and autonomic function in rats

Peter, Jean-Christophe and Zipfel, Géraldine and Lecourt, Anne-Catherine and Bekel, Akkiz and Hofbauer, Karl G.. (2010) Antibodies raised against different extracellular loops of the melanocortin-3 receptor affect energy balance and autonomic function in rats. Journal Of Receptors And Signal Transduction, Vol. 30. pp. 444-453.

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Official URL: http://edoc.unibas.ch/dok/A5842461

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Abstract

Melanocortin receptors (MCR) play an important role in the regulation of energy balance and autonomic function. In the present studies, we used active immunization against peptide sequences from the first and the third extracellular loop (EL1 and EL3) of the MC3R to generate selective antibodies (Abs) against this MCR subtype in rats. Immunization with the EL1 peptide resulted in Abs that enhanced the effects of the endogenous ligand alpha-melanocyte-stimulating hormone (alpha-MSH), whereas immunization with the EL3 peptide resulted in Abs acting as non-competitive antagonists. The phenotype of immunized rats chronically instrumented with telemetry transducers was studied under four different conditions: a high-fat diet was followed by standard lab chow, by fasting, and finally by an intraperitoneal injection of lipopolysaccharide (LPS). Under high-fat diet, food intake and body weight were higher in the EL3 than in the EL1 or the control group. Blood pressure was increased in EL3 rats and locomotor activity was reduced. Plasma concentrations of triglycerides, insulin, and leptin tended to rise in the EL3 group. After switching to standard lab chow, the EL1 group showed a small significant increase in blood pressure that was more pronounced and associated with an increase in heart rate during food restriction. No differences between the EL1 or the EL3 group were observed after LPS injection. These results show that immunization against the MC3R resulted in the production of Abs with positive or negative allosteric properties. The presence of such Abs induced small changes in metabolic and cardiovascular parameters.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Pharmacology/Neurobiology (Hofbauer)
03 Faculty of Medicine > Departement Biomedizin > Former Units at DBM > Angewandte Pharmakologie (Hofbauer)
UniBasel Contributors:Hofbauer, Karl G.
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Marcel Dekker
ISSN:0197-5110
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:24 May 2013 09:06
Deposited On:08 Jun 2012 06:51

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