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Effects of group II and III metabotropic glutamate receptor ligands on conditioned taste aversion learning
D Klakotskaia1, A K Ramsey, S W Fowler
1Department of Psychological Sciences, University of Missouri, Columbia, MO 65211, USA.
Abstract:
Metabotropic glutamate (mGlu) receptors impact learning and memory. Although some evidence indicates the importance of these receptors in conditioned taste aversion (CTA), the subtype-specific involvement of mGlu receptors in this associative learning task remains to be determined. These experiments examined the effects of (1R,4R,5S,6R)-4-amino-2-oxabicyclo[3.1.0]hexane-4,6-dicarboxylic acid (LY379268), a selective group II mGlu receptor agonist, cis-2-[[(3,5-dichlorophenyl)amino]carbonyl]cyclohexanecarboxylic acid (VU0155041), a mGlu4 positive allosteric modulator, N,N'-dibenzhydrylethane-1,2-diamine (AMN082), a mGlu7 allosteric agonist, and 6-(4-methoxyphenyl)-5-methyl-3-(4-pyridinyl)-isoxazolo[4,5-c]pyridin-4(5H)-one (MMPIP), a mGlu7 negative allosteric modulator, on the acquisition of CTA using male Sprague-Dawley rats. Systemic injections of LY379268, AMN082, and MMPIP prior to conditioning decreased the acquisition of CTA, revealing that mGlu2/3 and mGlu7 are involved in CTA learning.
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