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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

MPEP, a selective metabotropic glutamate receptor 5 antagonist, attenuates conditioned taste aversion in rats.

Metabotropic glutamate receptors (mGluRs) have been implicated in several types of cognitive and associative learning. Although recent evidence indicates an influence of mGluRs in conditioned taste aversion (CTA), the subtype-specific involvement of mGluRs in this learning paradigm remained to be determined. The aim of this study was to examine the role of Group I mGluR subtypes in CTA using a selective mGluR5 antagonist (2-methyl-6-(phenylethynyl)-pyridine, MPEP) and a selective mGluR1 antagonist (1-aminoindan-1,5-dicarboxylic acid, AIDA). Male, water-deprived, Sprague-Dawley rats were injected i.p. with 6 or 12 mg/kg MPEP or saline. Twenty-five minutes later, all rats received 15-min access to a 0.1% saccharin solution (Sac) immediately followed by an injection of 0.15M LiCl at 1.33% body weight. The animals were tested with 15-min access to Sac on each of four test days. MPEP-treated animals consumed more Sac on the test trials than saline-treated rats. In another experiment, controlled access to Sac was used by infusing the solution on the conditioning trial. Consistent with the above results, MPEP attenuated the degree of CTA. Similar experiments using the mGluR1 antagonist AIDA, have found no effect on CTA learning. These results suggest that the two subtypes of Group I mGluRs are differentially involved in taste aversion learning.[1]

References

  1. MPEP, a selective metabotropic glutamate receptor 5 antagonist, attenuates conditioned taste aversion in rats. Schachtman, T.R., Bills, C., Ghinescu, R., Murch, K., Serfozo, P., Simonyi, A. Behav. Brain Res. (2003) [Pubmed]
 
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