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- W2035993896 abstract "Adaptive changes in neural systems due to chronic opiate exposure are related to the neural plasticity phenomenon, NMDA receptors being implicated in these processes, e.g. tolerance, dependence or withdrawal. In this work, we investigated the effect of two non-competitive NMDA antagonists, memantine and MK-801, in motivational (Conditioned Place Aversion paradigm, CPA) and physical aspects of morphine withdrawal. After the induction of morphine dependence, animals in which the CPA was studied, received memantine (5 and 10 mg/kg) or MK-801 (0.3–0.006 mg/kg) either during the acquisition (conditioning) or expression (test) phase of this procedure. Both drugs were capable of inhibiting conditioned aversion when administered in any phase. In a second experiment, the effects of these drugs were evaluated in the intensity of the physical signs of withdrawal, only memantine administration being efficient. In addition to these studies, the intensity of morphine dependence was investigated under the blockade of NMDA receptors, i.e. morphine was co-administered with memantine or MK-801. These animals did not develop CPA and present less intensity in the physical signs of morphine withdrawal. Our results support the idea that NMDA receptors are involved in the behavioural changes and therefore in the neural adaptations produced by repeated morphine administration." @default.
- W2035993896 created "2016-06-24" @default.
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- W2035993896 date "2003-09-01" @default.
- W2035993896 modified "2023-10-18" @default.
- W2035993896 title "Memantine presents different effects from MK-801 in motivational and physical signs of morphine withdrawal" @default.
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- W2035993896 doi "https://doi.org/10.1016/s0166-4328(03)00044-5" @default.
- W2035993896 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12946592" @default.
- W2035993896 hasPublicationYear "2003" @default.
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