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Issue 3, 2017
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Multivalent ligands for the serotonin 5-HT4 receptor

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5-HT4 receptors are known to form constitutive dimers in membranes. To explore whether multivalency can enhance ligand interactions and/or efficacy in 5-HT4 receptors, the structure of the partial agonist ML10302 was modified with oligo(ethylene glycol) chains, thus generating, by a gradual approach, short and long tethered bivalent or tetravalent ligands and the corresponding spanner-linked monovalent controls. Both bivalent and tetravalent ligands displayed a 10–20-fold increase in binding affinity compared to appropriate controls, but no multivalent ligand showed greater binding energy than ML10302 itself. Furthermore, the direct assessment of receptor–Gs interaction and studies of cAMP signalling indicated that multivalency does not enhance the efficacy of ML10302.

Graphical abstract: Multivalent ligands for the serotonin 5-HT4 receptor

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The article was received on 08 Aug 2016, accepted on 07 Feb 2017 and first published on 09 Feb 2017

Article type: Research Article
DOI: 10.1039/C6MD00458J
Citation: Med. Chem. Commun., 2017,8, 647-651
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    Multivalent ligands for the serotonin 5-HT4 receptor

    F. Castriconi, M. Paolino, A. Donati, G. Giuliani, M. Anzini, L. Mennuni, C. Sabatini, M. Lanza, G. Caselli, F. Makovec, M. Sbraccia, P. Molinari, T. Costa and A. Cappelli, Med. Chem. Commun., 2017, 8, 647
    DOI: 10.1039/C6MD00458J

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