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Disruption of prepulse inhibition in mice lacking mGluR1
S A Brody1, F Conquet, M A Geyer
1Department of Psychiatry and Neurosciences, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0804, USA.
The European Journal of Neuroscience
|December 23, 2003
Summary
Metabotropic glutamate receptor 1 (mGluR1) plays a crucial role in sensorimotor gating, a process impaired in schizophrenia. Mice lacking mGluR1 show deficits in prepulse inhibition (PPI), suggesting its involvement in this neural function.
Area of Science:
- Neuroscience
- Psychopharmacology
- Genetics
Background:
- Sensorimotor gating, measured by prepulse inhibition of the startle response (PPI), is a key information processing mechanism.
- PPI deficits are observed in schizophrenia, making it a valuable model for studying the disorder's neurobiology.
- Metabotropic glutamate receptors (mGluRs), particularly Group I (mGluR5 and mGluR1), are implicated in neural modulation.
Purpose of the Study:
- To investigate the role of mGluR1 in modulating sensorimotor gating (PPI).
- To assess PPI in mGluR1 knockout (KO) mice and compare it to wild-type littermates.
Main Methods:
- Assessed PPI in mGluR1 KO and wild-type mice across multiple ages using a standard PPI paradigm.
- Administered phencyclidine (NMDA antagonist), raclopride (dopamine antagonist), and lamotrigine (mood stabilizer) to evaluate their effects on PPI in KO and wild-type mice.
Main Results:
- mGluR1 KO mice exhibited a significant PPI deficit at all tested ages.
- The PPI deficit in mGluR1 KO mice was not exacerbated by phencyclidine or reversed by raclopride.
- Lamotrigine ameliorated the PPI deficit in mGluR1 KO mice, though it also increased PPI in wild-type mice.
Conclusions:
- Both mGluR1 and mGluR5 (Group I mGluRs) are involved in the regulation of sensorimotor gating (PPI) in mice.
- These findings highlight the potential of targeting Group I mGluRs for therapeutic interventions in conditions with PPI deficits, such as schizophrenia.