Chemistry and pharmacology of GABAB receptor ligands

Advances in Pharmacology
Wolfgang Froestl

Abstract

This chapter presents new clinical applications of the prototypic GABA(B) receptor agonist baclofen for the treatment of addiction by drugs of abuse, such as alcohol, cocaine, nicotine, morphine, and heroin, a novel baclofen prodrug Arbaclofen placarbil, the GABA(B) receptor agonist AZD3355 (Lesogabaran) currently in Phase 2 clinical trials for the treatment of gastroesophageal reflux disease, and four positive allosteric modulators of GABA(B) receptors (CGP7930, GS39783, NVP-BHF177, and BHFF), which have less propensity for the development of tolerance due to receptor desensitization than classical GABA(B) receptor agonists. All four compounds showed anxiolytic affects. In the presence of positive allosteric modulators the "classical" GABA(B) receptor antagonists CGP35348 and 2-hydroxy-saclofen showed properties of partial GABA(B) receptor agonists. Seven micromolar affinity GABA(B) receptor antagonists, phaclofen; 2-hydroxy-saclofen; CGP's 35348, 36742, 46381, 51176; and SCH50911, are discussed. CGP36742 (SGS742) showed statistically significant improvements of working memory and attention in a Phase 2 clinical trial in mild, but not in moderate Alzheimer patients. Eight nanomolar affinity GABA(B) receptor antagonists are pre...Continue Reading

Associated Clinical Trials

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