作者:Suwanna Vangveravong、Elizabeth McElveen、Michelle Taylor、Jinbin Xu、Zhude Tu、Robert R. Luedtke、Robert H. Mach
DOI:10.1016/j.bmc.2005.09.008
日期:2006.2
A series of indole compounds have been prepared and evaluated for affinity at D-2-like dopamine receptors using stably transfected HEK cells expressing human D-2, D-3, or D-4 dopamine receptors. These compounds share structural elements with the classical D-2-like dopamine receptor antagonists, haloperidol, N-methylspiperone, and benperidol. The compounds that share structural elements with N-methylspiperone and benperidol bind non-selectively to the D-2 and D-3 dopamine receptor subtypes. However, several of the compounds structurally similar to haloperidol were found to (a) bind to the human D-2 receptor subtype with nanomolar affinity, (b) be 10- to 100-fold selective for the human D-2 receptor compared to the human D3 receptor, and (c) bind with low affinity to the human D-4 dopamine receptor subtype. Binding at sigma (sigma) receptor subtypes, sigma(1) and sigma(2), was also examined and it was found that the position of the methoxy group on the indole was pivotal in both (a) D, versus D-3 receptor selectivity and (b) affinity at sigma(1) receptors. Adenylyl cyclase studies indicate that our indole compounds with the greatest D-2 receptor selectivity are neutral antagonists at human D-2 dopamine receptor subtypes. With stably transfected HEK cells expressing human D-2 (hD(2)-HEK), these compounds (a) have no intrinsic activity and (b) attenuated quinpirole inhibition of adenylyl cyclase. The D-2 receptor selective compounds that have been identified represent unique pharmacological tools that have potential for use in studies on the relative contribution of the D-2 dopamine receptor subtypes in physiological and behavioral situations where D-2-like dopaminergic receptor involvement is indicated. (c) 2005 Elsevier Ltd. All rights reserved.