Quinolyl analogues of norlobelane: Novel potent inhibitors of [3H]dihydrotetrabenazine binding and [3H]dopamine uptake at the vesicular monoamine transporter-2
摘要:
We have previously shown that quinolyl moieties are attractive structural replacements for the phenyl groups in lobelane. These quinolyl analogues had improved water-solubility over lobelane and retained the potent vesicular monoamine transporter-2 (VMAT-2) inhibitory properties of the parent compound, with quinlobelane (4) exhibiting potent inhibition of uptake at VMAT-2 (K-i = 51 nM). However, the VMAT-2 inhibitory properties of quinolyl analogues of norlobelane, which is equipotent with lobeline as an inhibitor of [H-3] dopamine (DA) uptake at VMAT-2, have not been reported. In the current communication, we describe the synthesis of some novel des-methyl quinolyl analogues of lobelane that exhibit greater affinity (K-i = 178-647 nM) for the dihydrotetrabenazine binding site located on VMAT-2 compared with lobelane (K-i = 970 nM), norlobelane (K-i = 2310 nM) and quinlobelane (K-i = 2640 nM). The most potent compounds, 14 and 15, also exhibited inhibition of [H-3] DA uptake at VMAT-2 (K-i = 42 nM) which was comparable to both lobelane (K-i = 45 nM) and norlobelane (K-i = 43 nM). Results reveal that binding affinity at VMAT-2 serves as an accurate predictor of inhibition of the function of VMAT-2 for the majority of these analogues. These novel analogues are under consideration for further development as treatments for methamphetamine abuse. (C) 2015 Elsevier Ltd. All rights reserved.
Quinolyl analogues of norlobelane: Novel potent inhibitors of [3H]dihydrotetrabenazine binding and [3H]dopamine uptake at the vesicular monoamine transporter-2
作者:Derong Ding、Justin R. Nickell、Linda P. Dwoskin、Peter A. Crooks
DOI:10.1016/j.bmcl.2015.04.105
日期:2015.7
We have previously shown that quinolyl moieties are attractive structural replacements for the phenyl groups in lobelane. These quinolyl analogues had improved water-solubility over lobelane and retained the potent vesicular monoamine transporter-2 (VMAT-2) inhibitory properties of the parent compound, with quinlobelane (4) exhibiting potent inhibition of uptake at VMAT-2 (K-i = 51 nM). However, the VMAT-2 inhibitory properties of quinolyl analogues of norlobelane, which is equipotent with lobeline as an inhibitor of [H-3] dopamine (DA) uptake at VMAT-2, have not been reported. In the current communication, we describe the synthesis of some novel des-methyl quinolyl analogues of lobelane that exhibit greater affinity (K-i = 178-647 nM) for the dihydrotetrabenazine binding site located on VMAT-2 compared with lobelane (K-i = 970 nM), norlobelane (K-i = 2310 nM) and quinlobelane (K-i = 2640 nM). The most potent compounds, 14 and 15, also exhibited inhibition of [H-3] DA uptake at VMAT-2 (K-i = 42 nM) which was comparable to both lobelane (K-i = 45 nM) and norlobelane (K-i = 43 nM). Results reveal that binding affinity at VMAT-2 serves as an accurate predictor of inhibition of the function of VMAT-2 for the majority of these analogues. These novel analogues are under consideration for further development as treatments for methamphetamine abuse. (C) 2015 Elsevier Ltd. All rights reserved.