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Effect of combined treatment with mirtazapine and risperidone on the MK-801-induced changes in the object recognition
1Department of Pharmacology, Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, PL 31-343 Kraków, Poland. rogoz@if-pan.krakow.pl.
Background:
Several clinical reports have suggested that the mirtazapine-induced augmentation of risperidone activity may effectively improve treatment of the negative and certain cognitive symptoms of schizophrenia.
Methods:
The aim of the present study was to evaluate the effect of mirtazapine and risperidone, given separately or jointly, on the impact of MK-801(an NMDA receptor antagonist), given prior to the first introductory session, on the object recognition memory in mice. To this end, we used the object recognition test in which animals were tested for the ability to discriminate between an old, familiar and a novel object. Mirtazapine (2.5 or 5 mg/kg) and risperidone (0.01 mg/kg) were given 30 min before MK-801, and MK-801 (0.1 or 0.2 mg/kg) was administered 30 min before the first introductory session. Memory retention was evaluated 1.5 h after the introductory session.
Results:
The obtained results showed that MK-801 (0.2 mg/kg) decreased memory retention when given before the introductory session. Co-treatment with risperidone (0.01 mg/kg) and mirtazapine (2.5 or 5 mg/kg) abolished the effect of MK-801, whereas those drugs given separately did not change the action of MK-801.
Conclusions:
The obtained results suggest that mirtazapine may enhance the antipsychotic-like effect of risperidone in the animal test modeling some cognitive symptoms of schizophrenia. Further studies are necessary to elucidate its mechanism of action.
Insights
Mirtazapine enhances the antipsychotic effects of risperidone in mice, improving cognitive function. This combination therapy shows promise for treating schizophrenia symptoms.
Area of Science:
- Neuroscience
- Pharmacology
- Psychiatry
Background:
- Clinical reports suggest mirtazapine augments risperidone, potentially improving negative and cognitive symptoms in schizophrenia.
- Schizophrenia treatment often targets cognitive deficits, a persistent challenge in patient care.
Purpose of the Study:
- To investigate the combined effects of mirtazapine and risperidone on object recognition memory in mice.
- To assess if mirtazapine potentiates risperidone's antipsychotic-like effects in a model of cognitive dysfunction.
Main Methods:
- Object recognition test in mice to evaluate memory retention.
- Administration of MK-801 (NMDA receptor antagonist) to induce memory impairment.
- Mirtazapine and risperidone administered separately or jointly before MK-801.
Main Results:
- MK-801 significantly impaired object recognition memory.
- Co-administration of mirtazapine and risperidone completely reversed the memory impairment induced by MK-801.
- Mirtazapine and risperidone given alone did not affect MK-801's impact on memory.
Conclusions:
- Mirtazapine appears to enhance the antipsychotic-like efficacy of risperidone in an animal model relevant to schizophrenia cognitive symptoms.
- Further research is needed to fully understand the underlying mechanisms of this synergistic effect.
