Development of N-Methyl-(2-arylquinolin-4-yl)oxypropanamides as Leads to PET Radioligands for Translocator Protein (18 kDa)
摘要:
Translocator protein (18 kDa), known as TSPO, is a recognized biomarker of neuroinflammation. Radioligands with PET accurately quantify TSPO in neuroinflammatory conditions. However, the existence of three human TSPO genotypes that show differential affinity to almost all useful TSPO PET radioligands hampers such studies. There is an unmet need for genotype-insensitive, high-affinity, and moderately lipophilic TSPO ligands that may serve as leads for PET radioligand development. To address this need, we varied the known high-affinity TSPO ligand (l)-N,N-diethyl-2-methyl-3-(2-phenylquinolin-4-yl)propanamide in its aryl scaffold, side chain tether, and pendant substituted amido group while retaining an N-methyl group as a site for labeling with carbon-11. From this effort, oxygen-tethered N-methyl-aryloxypropanamides emerged as new high-affinity TSPO ligands with attenuated lipophilicity, including one example with attractive properties for PET radioligand development, namely N-methyl-N-phenyl-2-{[2-(pyridin-2-yl)quinolin-4-yl]oxy}propanamide (22a; rat K-i = 0.10 nM; human TSPO genotypes K-i = 1.4 nM; clogD = 4.18).
Development of N-Methyl-(2-arylquinolin-4-yl)oxypropanamides as Leads to PET Radioligands for Translocator Protein (18 kDa)
摘要:
Translocator protein (18 kDa), known as TSPO, is a recognized biomarker of neuroinflammation. Radioligands with PET accurately quantify TSPO in neuroinflammatory conditions. However, the existence of three human TSPO genotypes that show differential affinity to almost all useful TSPO PET radioligands hampers such studies. There is an unmet need for genotype-insensitive, high-affinity, and moderately lipophilic TSPO ligands that may serve as leads for PET radioligand development. To address this need, we varied the known high-affinity TSPO ligand (l)-N,N-diethyl-2-methyl-3-(2-phenylquinolin-4-yl)propanamide in its aryl scaffold, side chain tether, and pendant substituted amido group while retaining an N-methyl group as a site for labeling with carbon-11. From this effort, oxygen-tethered N-methyl-aryloxypropanamides emerged as new high-affinity TSPO ligands with attenuated lipophilicity, including one example with attractive properties for PET radioligand development, namely N-methyl-N-phenyl-2-{[2-(pyridin-2-yl)quinolin-4-yl]oxy}propanamide (22a; rat K-i = 0.10 nM; human TSPO genotypes K-i = 1.4 nM; clogD = 4.18).
[EN] PERIPHERAL BENZODIAZEPINE RECEPTOR LIGANDS<br/>[FR] LIGANDS DE RECEPTEURS PERIPHERIQUE DE LA BENZODIAZEPINE
申请人:THE UNIVERSITY OF BRITISH COLUMBIA
公开号:WO1999061024A1
公开(公告)日:1999-12-02
(EN) Compounds which bind with high affinity to peripheral benzodiazepine receptors are useful as antiinflammatory agents. Such compounds include isoquinoline derivatives, such as PK 11195, and benzodiazepine derivatives such as Ro 5-4864. A method of treating an inflammatory condition in a mammal with such compounds is provided. Pharmaceutical compositions comprising such compounds are described. A method is provided for identifying compounds that are therapeutically effective for treating inflammatory conditions.(FR) L'invention concerne des composés qui se lient avec forte affinité aux récepteurs périphériques de la benzodiazépine utiles comme agents anti-inflammatoires. Ces composés contiennent des dérivés d'isoquinoline, tels que PK 11195 et des dérivés de benzodiazépine, tels que Ro 5-4864. L'invention concerne également un procédé de traitement d'une maladie inflammatoire chez un mammifère à l'aide de ces composés et des compositions pharmaceutiques renfermant ces composés. Fait aussi l'objet de cette invention un procédé d'identification de composés thérapeutiquement efficaces pour le traitement des maladies inflammatoires.
Development of <i>N</i>-Methyl-(2-arylquinolin-4-yl)oxypropanamides as Leads to PET Radioligands for Translocator Protein (18 kDa)
作者:Chad Brouwer、Kimberly Jenko、Sami S. Zoghbi、Robert B. Innis、Victor W. Pike
DOI:10.1021/jm5007947
日期:2014.7.24
Translocator protein (18 kDa), known as TSPO, is a recognized biomarker of neuroinflammation. Radioligands with PET accurately quantify TSPO in neuroinflammatory conditions. However, the existence of three human TSPO genotypes that show differential affinity to almost all useful TSPO PET radioligands hampers such studies. There is an unmet need for genotype-insensitive, high-affinity, and moderately lipophilic TSPO ligands that may serve as leads for PET radioligand development. To address this need, we varied the known high-affinity TSPO ligand (l)-N,N-diethyl-2-methyl-3-(2-phenylquinolin-4-yl)propanamide in its aryl scaffold, side chain tether, and pendant substituted amido group while retaining an N-methyl group as a site for labeling with carbon-11. From this effort, oxygen-tethered N-methyl-aryloxypropanamides emerged as new high-affinity TSPO ligands with attenuated lipophilicity, including one example with attractive properties for PET radioligand development, namely N-methyl-N-phenyl-2-[2-(pyridin-2-yl)quinolin-4-yl]oxy}propanamide (22a; rat K-i = 0.10 nM; human TSPO genotypes K-i = 1.4 nM; clogD = 4.18).