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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The N-methyl-D-aspartate receptor channel blockers memantine, MRZ 2/579 and other amino-alkyl-cyclohexanes antagonise 5-HT(3) receptor currents in cultured HEK-293 and N1E-115 cell systems in a non-competitive manner.

The type 3 serotonin (5-HT(3)) receptor is a ligand-gated ion channel. In concentration-clamp experiments, we investigated the effects of the uncompetitive N-methyl-D-aspartate (NMDA) receptor antagonists memantine, amantadine and MRZ 2/579 on 5-HT receptors stabley expressed in HEK-293 cells and on native 5-HT(3) receptors in the N1E-115 cell line. All agents antagonized serotonin (10 microM)-induced inward currents with similar potency to that reported for NMDA receptors. This effect was characterized by inducing a pronounced receptor desensitization, and was probably non-competitive and voltage-independent. In contrast, (S)-ketamine was much weaker as an antagonist of 5-HT(3) receptors than NMDA receptors. Similar effects on 5-HT(3) receptors have been reported previously for a variety of anti-depressants and it is possible that the clinical anti-depressant effects reported for both memantine and amantadine are mediated, at least in part, by antagonistic effects at 5-HT(3) receptors.[1]


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