Istituto di Cristallografia - CNR

Bioisosteric replacement based on 1,2,4-oxadiazoles in the discovery of 1H-indazole-bearing neuroprotective MAO B inhibitors

Following a hybridization strategy, a series of 5-substituted-1H-indazoles were designed and evaluated in vitro as inhibitors of human monoamine oxidase (hMAO) A and B. Among structural modifications, the bioisostere-based introduction of 1,2,4-oxadiazole ring returned the most potent and selective human MAO B inhibitor (compound 20, IC = 52 nM, SI > 192). The most promising inhibitors were studied in cell-based neuroprotection models of SH-SY5Y and astrocytes line against HO. Moreover, preliminary drug-like features (aqueous solubility at pH 7.4; hydrolytic stability at acidic and neutral pH) were assessed for selected 1,2,4-oxadiazoles and compared to amide analogues through RP-HPLC methods. Molecular docking simulations highlighted the crucial role of molecular flexibility in providing a better shape complementarity for compound 20 within MAO B enzymatic cleft than rigid analogue 18. Enzymatic kinetics analysis along with thermal stability curves (T shift = +2.9 °C) provided clues of a tight-binding mechanism for hMAO B inhibition by 20.

European journal of medicinal chemistry
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Rullo, Mariagrazia; La Spada, Gabriella; Miniero, Daniela Valeria; Gottinger, Andrea; Catto, Marco; Delre, Pietro; Mastromarino, Margherita; Latronico, Tiziana; Marchese, Sara; Mangiatordi, Giuseppe Felice; Binda, Claudia; Linusson, Anna; Liuzzi, Grazia Maria; Pisani, Leonardo