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The metabotropic glutamate mGluR5 receptor agonist CHPG stimulates food intake

NeuroReport, ISSN: 0959-4965, Vol: 21, Issue: 10, Page: 704-708
2010
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Article Description

The metabotropic glutamate receptor 5 (mGluR5) has been suggested to modulate energy balance. For example, mGluR5 antagonists inhibit food intake in rodents and mGluR5 knockout mice resist diet-induced obesity. However, nonspecific effects can reduce food intake. Thus, to further support the role of mGluR5 in feeding behaviour, we evaluated if the mGluR5 agonist (R,S)-2-chloro-5-hydroxyphenylglycine (CHPG) would induce the opposite effect, i.e. increased food intake in rats. Intracerebroventricularly injected CHPG (0.5-1.5 μmol) induced a dose-dependent stimulation of food intake (349% increase at 2 h with 1.5 μmol). The mGluR5 antagonist 3-[(2-methyl-1,3- thiazol-4-yl)ethynyl]-pyridine (10 mg/kg intraperitoneally) reduced 24 h food intake, without altering CHPG-induced feeding. These findings further support a physiologically relevant role of mGluR5 in appetite regulation. © 2010 Wolters Kluwer Health | Lippincott Williams & Wilkins.

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