Novel Ligands Rationally Designed for Characterizing I2−Imidazoline Binding Sites Nature and Functions
摘要:
The study of two series of 2-aryl-ethylen-imidazolines 3-7 and 8-12 inspired by I(2)-IBS ligands phenyzoline (1) and diphenyzoline (2), respectively, confirmed the interesting "positive" or "negative" morphine analgesia modulation displayed by their corresponding leads and demonstrated that these effects might be correlated with morphine tolerance and dependence, respectively. By comparative examination of rationally designed compounds, some analogies between binding site cavity of I(2)-IBS proteins and alpha(2C)-adrenoreceptor emerged.
Homoazanicotine: A Structure-Affinity Study for Nicotinic Acetylcholine (nACh) Receptor Binding
摘要:
We have recently identified 3-[(1-methyl)-4,5-dihydro-1H-imidazol-2-yl)methyl]pyridine (homo-azanicotine, 8) as a novel nicotinic acetylcholinergic (nACh) receptor ligand. In the present investigation, after we determined that 8 binds selectively at nicotinic (K-i = 7.8 nM) vs muscarinic (K-i > 10 000 nM) acetylcholinergic receptors, we examined its structure-affinity relationships for nACh receptor binding. The features investigated included the influence of (i) the composition of connector that separates the two rings, (ii) the N-methyl group, (iii) the ring opening of the imidazoline ring, (iv) the pyridine nitrogen atom, and (v) the aromatization of the imidazoline ring on nACh receptor affinity. As with nicotine, the parent structure seems optimal and most structural changes reduce nACh receptor affinity. Also, as with nicotine analogues, alteration of the spacer group influences affinity in a manner that is somewhat different than that seen with the parent structure.
Homoazanicotine: A Structure-Affinity Study for Nicotinic Acetylcholine (nACh) Receptor Binding
作者:G. Ferretti、M. Dukat、M. Giannella、A. Piergentili、M. Pigini、W. Quaglia、M. I. Damaj、B. R. Martin、R. A. Glennon
DOI:10.1021/jm020188s
日期:2002.10.1
We have recently identified 3-[(1-methyl)-4,5-dihydro-1H-imidazol-2-yl)methyl]pyridine (homo-azanicotine, 8) as a novel nicotinic acetylcholinergic (nACh) receptor ligand. In the present investigation, after we determined that 8 binds selectively at nicotinic (K-i = 7.8 nM) vs muscarinic (K-i > 10 000 nM) acetylcholinergic receptors, we examined its structure-affinity relationships for nACh receptor binding. The features investigated included the influence of (i) the composition of connector that separates the two rings, (ii) the N-methyl group, (iii) the ring opening of the imidazoline ring, (iv) the pyridine nitrogen atom, and (v) the aromatization of the imidazoline ring on nACh receptor affinity. As with nicotine, the parent structure seems optimal and most structural changes reduce nACh receptor affinity. Also, as with nicotine analogues, alteration of the spacer group influences affinity in a manner that is somewhat different than that seen with the parent structure.
Novel Ligands Rationally Designed for Characterizing I<sub>2</sub>−Imidazoline Binding Sites Nature and Functions
The study of two series of 2-aryl-ethylen-imidazolines 3-7 and 8-12 inspired by I(2)-IBS ligands phenyzoline (1) and diphenyzoline (2), respectively, confirmed the interesting "positive" or "negative" morphine analgesia modulation displayed by their corresponding leads and demonstrated that these effects might be correlated with morphine tolerance and dependence, respectively. By comparative examination of rationally designed compounds, some analogies between binding site cavity of I(2)-IBS proteins and alpha(2C)-adrenoreceptor emerged.