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• W2034781595 abstract "Vesicular monoamine transporter-2 (VMAT2) is a viable target for development of pharmacotherapies for psychostimulant abuse. Lobeline (1) is a potent antagonist at alpha4beta2 * nicotinic acetylcholine receptors, has moderate affinity (K(i)=5.46microM) for VMAT2, and is being investigated currently as a clinical candidate for treatment of psychostimulant abuse. A series of carboxylic acid and sulfonic acid ester analogs 2-20 of lobeline were synthesized and evaluated for interaction with alpha4beta2 * and alpha7 * neuronal nicotinic acetylcholine receptors (nAChRs), the dopamine transporter (DAT), serotonin transporter (SERT) and VMAT2. Both carboxylic acid and sulfonic acid esters had low affinity at alpha7 * nAChRs. Similar to lobeline (K(i)=4nM), sulfonic acid esters had high affinity at alpha4beta2 * (K(i)=5-17nM). Aromatic carboxylic acid ester analogs of lobeline (2-4) were 100-1000-fold less potent than lobeline at alpha4beta2 * nAChRs, whereas aliphatic carboxylic acid ester analogs were 10-100-fold less potent than lobeline at alpha4beta2 *. Two representative lobeline esters, the 10-O-benzoate (2) and the 10-O-benzenesulfonate (10) were evaluated in the (36)Rb(+) efflux assay using rat thalamic synaptosomes, and were shown to be antagonists with IC(50) values of 0.85microM and 1.60microM, respectively. Both carboxylic and sulfonic acid esters exhibited a range of potencies (equipotent to 13-45-fold greater potency compared to lobeline) for inhibiting DAT and SERT, respectively, and like lobeline, had moderate affinity (K(i)=1.98-10.8microM) for VMAT2. One of the more interesting analogs, p-methoxybenzoic acid ester 4, had low affinity at alpha4beta2 * nAChRs (K(i)=19.3microM) and was equipotent with lobeline, at VMAT2 (K(i)=2.98microM), exhibiting a 6.5-fold selectivity for VMAT2 over alpha4beta2 nAChRs. Thus, esterification of the lobeline molecule may be a useful structural modification for the development of lobeline analogs with improved selectivity at VMAT2." @default.
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• W2034781595 date "2010-01-01" @default.
• W2034781595 modified "2023-10-18" @default.
• W2034781595 title "Lobeline esters as novel ligands for neuronal nicotinic acetylcholine receptors and neurotransmitter transporters" @default.
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• W2034781595 doi "https://doi.org/10.1016/j.bmc.2009.12.002" @default.
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