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• W2091052004 abstract "Monoamine-based antidepressant drugs increase α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) function and decrease N-methyl-d-aspartate receptor (NMDAR) function. The NMDAR antagonist ketamine shows potent antidepressant action in humans and the antidepressant-like effects of ketamine and monoamine-based antidepressants in rodents depend on increased AMPAR throughput. Further, the antidepressant-like effects of monoamine-based antidepressants are enhanced by AMPAR potentiation and by NMDAR antagonism. This has led to a hypothesis that antidepressant efficacy involves an increases ratio of AMPAR-to-NMDAR-mediated neurotransmission. To further elucidate the interaction of AMPAR, NMDAR and monoamine transmission we tested combinations of the AMPAR positive allosteric modulator (AMPA potentiator), (R,R)-N,N-(2,20-[biphenyl-4-40-diyl]bis[propane-2,1-diyl])dimethanesulfonamide (PIMSD), with: the uncompetitive NMDAR antagonist MK-801; nicotine, which has potent glutamate-releasing properties; and the selective serotonin reuptake inhibitor escitalopram using the mouse forced swim (mFST) and tail suspension tests (mTST). MK-801, nicotine or escitalopram did not induce antidepressant-like effects in either of the two tests. PIMSD enhanced the effect of MK-801 in the mFST, supporting the hypothesis that increasing AMPAR-to-NMDAR-mediated neurotransmission conveys antidepressant action. Nicotine-induced glutamate release simultaneously activates NMDARs and AMPARs and showed no net effect in the mFST when given alone. However, increasing the ratio of AMPAR-to-NMDA-R transmission by favouring AMPAR throughput with PIMSD revealed an antidepressant-like action of nicotine in the mFST. PIMSD also enhanced the effect of escitalopram treatment in the mFST and mTST, supporting existing evidence and suggesting a synergistic effect of simultaneously facilitating monoamine transmission and increasing the ratio of AMPAR-to-NMDAR throughput. No synergistic effects of the PIMSD+MK-801 or PIMSD+nicotine were found in the mTST, indicating a differential sensitivity of mFST and mTST when investigating glutamate-based antidepressant mechanisms. This study corroborates existing evidence that there may be an unexploited therapeutic potential in treating depression by directly increasing the ratio of AMPAR-to-NMDAR neurotransmission, possibly in combination with monoamine-based mechanisms." @default.
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• W2091052004 date "2013-06-01" @default.
• W2091052004 modified "2023-10-03" @default.
• W2091052004 title "Does increasing the ratio of AMPA-to-NMDA receptor mediated neurotransmission engender antidepressant action? Studies in the mouse forced swim and tail suspension tests" @default.
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• W2091052004 doi "https://doi.org/10.1016/j.neulet.2013.04.045" @default.
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