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Inappropriate discontinuation of drug treatment and noncompliance are a leading cause of long-term morbidity during treatment of depression. Increasing evidence supports an association between depressive illness and disturbances in brain glutamate activity, nitric oxide synthesis, and γ-amino butyric acid. Animal models also confirm that suppression of glutamate N-methyl-D-aspartate receptor activity...
The effect of N-methyl-d-aspartate (NMDA) receptor blockade on the expression of preproenkephalin (PPE), preprotachykinin (PPT) and preprodynorphin (PPD) mRNAs in the caudate-putamen and nucleus accumbens was assessed with the non-competitive NMDA receptor antagonist MK-801. Administration of MK-801 once daily for 7 consecutive days increased the abundance of all three neuropeptide mRNAs in the caudate-putamen...
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