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Table of Contents
Vol. 16, No. 1, 2009
Issue release date: January 2009
Neuroimmunomodulation 2009;16:19–27
(DOI:10.1159/000179663)

Pharmacological Manipulation of Immune-Induced Food Aversion in Rats

Zarzana E.C. · Basso A.S. · Costa-Pinto F.A. · Palermo-Neto J.
Laboratory of Pharmacology and Toxicology, Department of Pathology, School of Veterinary Medicine, University of São Paulo, São Paulo, Brazil

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Abstract

Background: Mice allergic to ovalbumin (OVA) avoid drinking a solution containing this antigen. This was interpreted as related to IgE-dependent mast cell degranulation and sensory C fiber activation. Methods: We employed pharmacological manipulation to further investigate the mediators involved in immune-induced food aversion. Results: While nonimmunized rats preferred a sweetened OVA solution, immunized rats avoided it. We also employed a paradigm in which rats are conditioned to drink water for two 10-min sessions a day. Tolerant rats presented lower IgE titers, and this manipulation abrogated food aversion. Dexamethasone (1.0 mg/kg) prevented the aversion of OVA-immunized rats to the antigen-containing solution. Combined blockade of H1 and 5-hydroxytryptamine (5-HT)2 receptors by promethazine (3.0 mg/kg) plus methysergide (5.0 mg/kg) was unable to alter food aversion. Blockade of 5-HT3 receptors by ondansetron (1.0 mg/kg) caused a twofold increase in the ingestion of the sweetened OVA solution by immunized rats, suggesting the involvement of 5-HT3 receptors in food aversion. Finally, we showed that dexamethasone or promethazine plus methysergide, but not ondansetron, effectively prevented the IgE-dependent mast-cell-degranulation-induced increase in vascular permeability in rats. Conclusion: We suggest that regardless of whether or not they cause edema, IgE-mediated mast cell degranulation and consequent 5-HT3 signaling are involved in the process that triggers avoidance to the source of the allergen in allergic rats.



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