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Mechanisms of blockade of glutamate receptor ionic channels: Paradox of 9-aminoacridine

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Biochemistry (Moscow) Supplement Series A: Membrane and Cell Biology Aims and scope

Abstract

9-Aminoacridine and tacrine differ from other channel blockers of NMDA receptors in that their binding prevents the closing of blocked channels and subsequent dissociation of the agonist. Structural determinants of aminoacridine derivatives underlying the blocking mechanism are still unknown. The aim of this study was to elucidate the effects of a dicationic 9-aminoacridine derivative and some other tricyclic compounds on NMDA receptors of rat hippocampal pyramidal neurons. All the compounds under study are voltage-dependent blockers of NMDA channels; their IC50 values recorded at −80 mV vary from 1 to 50 µM. The dicationic derivatives demonstrate the same voltage dependence of the block as the monocationic derivatives. The monoand dicationic tricyclic compounds under study are weak blockers of AMPA receptor channels and differ from adamantane, phenylcyclohexyl and other dicationic derivatives that exhibit greater voltage dependence of the NMDA channel block and are able to induce effective suppression of AMPA channels. We conclude that the mechanisms of action of the tricyclic and dicationic 9-aminoacridine derivatives are different from that of 9-aminoacridine, since these compounds do not prevent closing of the blocked channels. This suggests that the binding site for 9-aminoacridine has specific properties and high selectivity with respect to ligand structure.

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Authors and Affiliations

  1. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg, 194223, Russia

    K. H. Kim, D. B. Tikhonov & L. G. Magazanik

  2. Institute of Experimental Medicine, Russian Academy of Medical Sciences, St. Petersburg, 197376, Russia

    V. E. Gmiro

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  1. K. H. Kim
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  2. V. E. Gmiro
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  3. D. B. Tikhonov
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  4. L. G. Magazanik
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Original Russian Text © K.H. Kim, V.E. Gmiro, D.B. Tikhonov, L.G. Magazanik, 2007, published in Biologicheskie Membrany, 2007, Vol. 24, No. 1, pp. 96–104.

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Kim, K.H., Gmiro, V.E., Tikhonov, D.B. et al. Mechanisms of blockade of glutamate receptor ionic channels: Paradox of 9-aminoacridine. Biochem. Moscow Suppl. Ser. A 1, 88–95 (2007). https://doi.org/10.1134/S1990747807010102

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  • DOI: https://doi.org/10.1134/S1990747807010102

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