Synthesis and Pharmacological Profile of a Series of 1-substituted-2-Carbonyl Derivatives of Diphenidol: Novel M4 Muscarinic Receptor Antagonists

Lucilla      Varoli; Piero      Angeli; Michela      Buccioni; Silvia      Burnelli; Nicola      Fazio; Gabriella      Marucci; Maurizio      Recanatini; Santi      Spampinato

doi:10.2174/157340608783789211

Abstract

Novel 2-carbonyl analogues of diphenidol (1) - bearing lipophylic 1-substituents (2) - were synthesized starting from previously investigated diphenidol derivatives acting as M2-selective muscarinic antagonists. These compounds were tested for receptor binding affinity versus human muscarinic M1-M5 receptors stably expressed in CHO-K1 cells. Their activity in functional assays carried out on CHO-K1 cells expressing human M4 receptors (CHO-hM4) and on classical models of M1-M3 receptors, in guinea pig and rabbit tissue preparations, was also evaluated. Compound 2d showed an affinity of pKi = 7.73 at the human M4-receptor subtype with selectivity ratios ranging from 31-fold (M4/M5) to 60-fold (M4/M2). Interestingly this compound, in CHO-hM4 cells, blocked the inhibition of forskolin-activated cAMP accumulation produced by carbachol (IC50= 61 nM) whereas it was a weak muscarinic antagonist in functional tests carried out in guinea-pig and rabbit tissue expressing M1 (pKb = 5.96), M2 (pKb = 6.43) and M3 (pKb = 6.09) receptors. In conclusion, the modifications performed in this work on reference compounds led us to obtain surprisingly a M4 selective antagonist. Considering the therapeutic indications for M4 selective antagonists, compound 2d may serve as a novel lead compound for further optimization.

Keywords: Muscarinic antagonists, subtype selectivity, diphenidol derivatives, binding studies, functional studies, cAMP

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