title: Evaluation of (Z)-2-((1-benzyl-1H-indol-3-yl)methylene)-quinuclidin-3-one analogues as novel, high affinity ligands for CB1 and CB2 cannabinoid receptors.
abstract: A small library of N-benzyl indolequinuclidinone (IQD) analogs has been identified as a novel class of cannabinoid ligands. The affinity and selectivity of these IQDs for the two established cannabinoid receptor subtypes, CB1 and CB2, was evaluated. Compounds 8 (R=R(2)=H, R(1)=F) and 13 (R=COOCH3, R(1)=R(2)=H) exhibited high affinity for CB2 receptors with Ki values of 1.33 and 2.50 nM, respectively, and had lower affinities for the CB1 receptor (Ki values of 9.23 and 85.7 nM, respectively). Compound 13 had the highest selectivity of all the compounds examined, and represents a potent cannabinoid ligand with 34-times greater selectivity for CB2R over CB1R. These findings are significant for future drug development, given recent reports demonstrating beneficial use of cannabinoid ligands in a wide variety of human disease states including drug abuse, depression, schizophrenia, inflammation, chronic pain, obesity, osteoporosis and cancer.
authors: Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
authors: Nikhil Reddy
authors: NR
authors: Madadi
authors: Narsimha Reddy
authors: NR
authors: Penthala
authors: Lisa K
authors: LK
authors: Brents
authors: Benjamin M
authors: BM
authors: Ford
authors: Paul L
authors: PL
authors: Prather
authors: Peter A
authors: PA
authors: Crooks
mesh_terms: D006801:Humans; D007211:Indoles / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D008024:Ligands; D015394:Molecular Structure; D011812:Quinuclidines / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D043884:Receptor, Cannabinoid, CB1 / Q000378:metabolism*; D043885:Receptor, Cannabinoid, CB2 / Q000378:metabolism*; D013237:Stereoisomerism
chemical_list: D007211:Indoles; D008024:Ligands; D011812:Quinuclidines; D043884:Receptor, Cannabinoid, CB1; D043885:Receptor, Cannabinoid, CB2