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• W1966103992 abstract "It has recently been reported that psychotic symptoms in patients such as those with Parkinson's disease dementia (PDD) and Lewy body dementia (LBD) may worsen following treatment with memantine, a non-competitive NMDA receptor antagonist. Prepulse inhibition (PPI) of the acoustic startle response (ASR) is used as a measure for sensorimotor gating and it has been reported that PPI is disrupted by memantine. However, the mechanism of memantine-induced PPI disruption remains unclear. In the present study, we investigated the effects of memantine on PPI of the ASR in mice. Memantine (1.25-20mg/kg, intraperitoneally) increased the ASR and dose-dependently decreased PPI for all prepulse intensities tested. This effect of memantine on PPI was attenuated by pretreatment with the antipsychotics clozapine (3 and 6 mg/kg), risperidone (0.3mg/kg) and haloperidol (0.5mg/kg), the selective D(2) antagonist sulpiride (40 mg/kg) and 5-HT(2A/2C) antagonist ketanserin (2 and 4 mg/kg) but not with the selective D(1) antagonist SCH23390 (0.05 and 0.1mg/kg). Clozapine (6 mg/kg) and risperidone (0.3 mg/kg) significantly attenuated the increased startle amplitude in the memantine-treated groups. These results suggest that involvement of dopaminergic and/or serotonergic neurotransmission may play a crucial role in memantine-induced PPI disruption, and additionally, indicate that blockade of either the D(2) or 5-HT(2A) receptor may prevent disruption of PPI induced by memantine in mice. Conceivably, memantine may exacerbate psychotic symptoms in patients with PDD and LBD." @default.
• W1966103992 created "2016-06-24" @default.
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• W1966103992 date "2011-03-01" @default.
• W1966103992 modified "2023-10-17" @default.
• W1966103992 title "Pharmacological characterizations of memantine-induced disruption of prepulse inhibition of the acoustic startle response in mice: Involvement of dopamine D2 and 5-HT2A receptors" @default.
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• W1966103992 doi "https://doi.org/10.1016/j.bbr.2010.11.053" @default.
• W1966103992 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21130810" @default.
• W1966103992 hasPublicationYear "2011" @default.
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