Linked Life Data

16803860

Source:http://linkedlifedata.com/resource/pubmed/id/16803860

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pubmed-article:16803860pubmed:abstractTextAntidepressant-like effects of metabotropic glutamate (mGlu)5 receptor antagonists have been reported previously. We now provide definitive identification of mGlu5 receptors as a target for these effects through the combined use of selective antagonists and mice with targeted deletion of the mGlu5 protein. In these experiments, the mGlu5 receptor antagonists 2-methyl-6-(phenylethynyl)-pyridine (MPEP) and the more selective and metabolically stable analog 3-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-pyridine (MTEP) decreased immobility in the mouse forced swim test, a test predictive of antidepressant efficacy in humans. mGlu5 receptor knockout mice had a phenotype in the forced swim test that was congruent with the effects of receptor blockade; mGlu5 receptor knockout mice were significantly less immobile than their wild-type counterparts. Consistent with mGlu5 receptor mediation of the antidepressant-like effects of MPEP, the effects of MPEP were not observed in mGlu5 receptor knockout mice, whereas comparable effects of the tricyclic antidepressant imiprimine remained active in the mutant mice. MPEP and imiprimine resulted in a synergistic antidepressant-like effect in the forced swim test. The drug interaction was not likely because of increased levels of drugs in the brain, suggesting a pharmacodynamic interaction of mGlu5 and monoaminergic systems in this effect. Thus, the present findings substantiate the hypothesis that mGlu5 receptor antagonism is associated with antidepressant-like effects. This mechanism may not only provide a novel approach to the therapeutic management of depressive disorders but also may be useful in the augmentation of effects of traditional antidepressant agents.lld:pubmed
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pubmed-article:16803860pubmed:articleTitleMetabotropic glutamate 5 receptor antagonism is associated with antidepressant-like effects in mice.lld:pubmed
pubmed-article:16803860pubmed:affiliationNeuroscience Discovery Research, Lilly Research Laboratories, Eli Lilly & Co, Indianapolis, IN 46285-0510, USA. li_xia_X1@lilly.comlld:pubmed
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