Design and Synthesis of Systemically Active Metabotropic Glutamate Subtype-2 and -3 (mGlu<sub>2/3</sub>) Receptor Positive Allosteric Modulators (PAMs): Pharmacological Characterization and Assessment in a Rat Model of Cocaine Dependence
作者:Raveendra-Panickar Dhanya、Douglas J. Sheffler、Russell Dahl、Melinda Davis、Pooi San Lee、Li Yang、Hilary Highfield Nickols、Hyekyung P. Cho、Layton H. Smith、Manoranjan S. D’Souza、P. Jeffrey Conn、Andre Der-Avakian、Athina Markou、Nicholas D. P. Cosford
DOI:10.1021/jm5000563
日期:2014.5.22
As part of our ongoing small-molecule metabotropic glutamate (mGlu) receptor positive allosteric modulator (PAM) research, we performed structure activity relationship (SAR) studies around a series of group II mGlu PAMs. Initial analogues exhibited weak activity as mGlu(2) receptor PAMs and no activity at mGlu(3). Compound optimization led to the identification of potent mGlu(2/3) selective PAMs with no in vitro activity at mGlu(1,4-8) or 45 other CNS receptors. In vitro pharmacological characterization of representative compound 44 indicated agonist-PAM activity toward mGlu(2) and PAM activity at mGlu(3). The most potent mGlu(2/3) PAMs were characterized in assays predictive of ADME/T and pharmacokinetic (PK) properties, allowing the discovery of systemically active mGlu(2/3) PAMs. On the basis of its overall profile, compound 74 was selected for behavioral studies and was shown to dose-dependently decrease cocaine self-administration in rats after intraperitoneal administration. These mGlu(2/3) receptor PAMs have significant potential as small molecule tools for investigating group II mGlu pharmacology.