4-Amino-7,8-dihydro-1,6-naphthyridin-5(6<i>H</i>)-ones as Inhaled Phosphodiesterase Type 4 (PDE4) Inhibitors: Structural Biology and Structure–Activity Relationships
作者:Richard S. Roberts、Sara Sevilla、Manel Ferrer、Joan Taltavull、Begoña Hernández、Victor Segarra、Jordi Gràcia、Martin D. Lehner、Amadeu Gavaldà、Miriam Andrés、Judit Cabedo、Dolors Vilella、Peter Eichhorn、Elena Calama、Carla Carcasona、Montserrat Miralpeix
DOI:10.1021/acs.jmedchem.7b01751
日期:2018.3.22
Rational design of a novel template of naphthyridinones rapidly led to PDE4 inhibitors with subnanomolar enzymatic potencies. X-ray crystallography confirmed the binding mode of this novel template. We achieved compounds with double-digit picomolar enzymatic potencies through further structure-based design by targeting both the PDE4 enzyme metal binding pocket and occupying the solvent-filled pocket. A strategy for lung retention and long duration of action based on low aqueous solubility was followed. In vivo efficacies were measured in a rat lung neutrophilia model by suspension microspray and dry powder administration. Suspension microspray of potent compounds showed in vivo efficacy with a clear dose-response. Despite sustained lung levels, dry powder administration performed much less well and without proper dose-response, highlighting clear differences between the two formulations. This indicates a deficiency in the low aqueous solubility strategy for long duration lung efficacy.