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EnglishAbstract: 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.
| Titolo: | Synthesis and pharmacological profile of a series of 1-substituted-2-carbonyl derivatives of diphenidol: novel M4 muscarinic receptor antagonists |
| Autore/i: | VAROLI, LUCILLA; P. Angeli; M. Buccioni; BURNELLI, SILVIA; FAZIO, NICOLA; G. Marucci; RECANATINI, MAURIZIO; SPAMPINATO, SANTI MARIO |
| Autore/i Unibo: | |
| Anno: | 2008 |
| Rivista: | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.2174/157340608783789211 |
| Abstract: | 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. |
| Data prodotto definitivo in UGOV: | 2008-05-09 |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
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http://hdl.handle.net/11585/60826
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