The role of group I metabotropic glutamate receptors in schizophrenia |
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Authors: | M Pietraszek J Nagel A Gravius D Schäfer W Danysz |
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Institution: | (1) Preclinical R&D, Merz Pharmaceuticals GmbH, Frankfurt am Main, Germany;(2) Department of Neuro-Psychopharmacology, Institute of Pharmacology, Polish Academy of Sciences, Cracow, Poland |
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Abstract: | Summary. It has been proposed that glutamatergic transmission, in particular NMDA receptor function, might be altered in schizophrenia.
This hypothesis is mainly based on the observation that uncompetitive NMDA receptor antagonists, e.g. phencyclidine, evoke
psychotic symptoms in healthy subjects, whereas agonists interacting at the glycine site of the NMDA receptor complex, e.g.
glycine or D-serine, administered jointly with typical neuroleptics, can alleviate schizophrenic symptoms. The function of
NMDA receptors may be modulated by group I mGluRs (mGluR1 and mGluR5), which have also been shown to be altered in schizophrenia.
In rodents, mGluR5 antagonists, but not mGluR1 ones, potentiate the locomotor activity and the deficit of prepulse inhibition
(PPI) induced by uncompetitive NMDA receptor antagonists. These antagonists (of either type) administered alone are not active
in the above tests. Hence, antagonists of mGluR1 and mGluR5 may evoke different effects on the NMDA receptor antagonists-induced
behavior and, possibly, on schizophrenic symptoms. |
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Keywords: | : NMDA receptors – mGluR1 – mGluR5 – Prepulse inhibition – Locomotor activity – Schizophrenia |
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