Abstract
Astemizole, a H1R antagonist shows high affinity to the histamine H1 receptor but only a moderate affinity to the histamine H4 receptor. This study aims to modify the astemizole to keep high affinity to the histamine H1 receptor and to increase affinity to the histamine H4 receptor. Therefore, 13 astemizole-derived compounds and astemizole-JNJ7777120-derived hybrid compounds were synthesized and pharmacologically characterized at the histamine H1 and H4 receptors. The new compounds show affinity to the histamine H1 receptor in the pK i range from 5.3 to 8.8, whereas the affinity of these compounds to the histamine H4 receptor was surprisingly rather low (pK i from 4.4 to 5.6). Three representative compounds were docked into the histamine H1 receptor and molecular dynamic studies were performed to explain the binding mode and the experimental results on a molecular level. Furthermore, taking into account the binding mode of compounds with high affinity to the histamine H4 receptor, a H1/H4-pharmacophore hypothesis was developed.
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Acknowledgments
The authors are grateful to Christine Braun, Kerstin Röhrl, and Gertraud Wilberg for expert technical assistance, Maria Beer-Krön and Susanne Gobleder for performing some of the assays. This work was supported by the Deutsche Forschungsgemeinschaft (Project STR 1125/1-1 and the Graduate Training Program (Graduiertenkolleg) GRK 760, “Medicinal Chemistry: Molecular Recognition-Ligand-Receptor Interactions”).
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Wagner, E., Wittmann, HJ., Elz, S. et al. Pharmacological profile of astemizole-derived compounds at the histamine H1 and H4 receptor—H1/H4 receptor selectivity. Naunyn-Schmiedeberg's Arch Pharmacol 387, 235–250 (2014). https://doi.org/10.1007/s00210-013-0926-4
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DOI: https://doi.org/10.1007/s00210-013-0926-4