ABSTRACT
Starting from a non-steroidal glucocorticoid agonist aryl pyrazole derivative, the NFkappaB agonist activity was optimised in an iterative process from pIC(50) 7.5 (for 7), to pIC(50) 10.1 (for 38E1). An explanation for the SAR observed based is presented along with a proposed docking of 38E1 into the active site of the glucocorticoid receptor.
Subject(s)
Pyrazoles/chemistry , Receptors, Glucocorticoid/agonists , Catalytic Domain , Cell Line , Computer Simulation , Humans , Indazoles/chemistry , NF-kappa B/metabolism , Receptors, Glucocorticoid/metabolism , Structure-Activity RelationshipABSTRACT
The synthesis and biological activity of tetrahydronaphthalene derivatives coupled to various heterocycles are described. These compounds are potent glucocorticoid receptor agonists with efficacy selectivity in an NFkappaB glucocorticoid receptor (GR) agonist assay (representing transrepression effects) over an MMTV GR agonist assay (representing transactivation effects). Quinolones, indoles, and C- and N-linked quinolines are some of the heterocycles that provide efficacy selectivity. For example, the isoquinoline 49D1E2 has NFkappaB agonism with pIC50 of 8.66 (89%) and reduced efficacy in MMTV agonism (6%), and the quinoline 55D1E1 has NFkappaB agonism with pIC50 of 9.30 (101%) and reduced efficacy in MMTV agonism with pEC50 of 8.02 (47%). A description of how a compound from each class is modeled in the active site of the receptor is given.
Subject(s)
Anti-Inflammatory Agents, Non-Steroidal/chemical synthesis , Receptors, Glucocorticoid/agonists , Tetrahydronaphthalenes/chemical synthesis , Anti-Inflammatory Agents, Non-Steroidal/chemistry , Anti-Inflammatory Agents, Non-Steroidal/pharmacology , Binding Sites , Cell Line , Drug Partial Agonism , Humans , Mammary Tumor Virus, Mouse/genetics , Models, Molecular , Molecular Mimicry , NF-kappa B/genetics , Receptors, Glucocorticoid/antagonists & inhibitors , Stereoisomerism , Structure-Activity Relationship , Tetrahydronaphthalenes/chemistry , Tetrahydronaphthalenes/pharmacology , Transcription, Genetic/drug effects , Transcriptional Activation/drug effectsABSTRACT
Starting from an established series of non-steroidal glucocorticoid receptor (GR) agonists, a large array was designed where a metabolically labile benzoxazinone moiety was replaced. Initial hits bound to GR but lacked agonist activity. Following two further iterations, potent GR agonists were discovered with 20D1E1 having NFkappaB agonism pIC(50) 8.8 (103%). Other analogues such as 23D1E1 display a dissociated profile (NFkappaB pIC(50) 8.1 (103%), MMTV pEC(50) 7.02 (36%)). The tetrahydronaphthalene moiety can also be replaced with substituted aryls such as 24E1 and 25E1.
Subject(s)
Glucocorticoids/agonists , Pyrazoles/chemistry , Receptors, Glucocorticoid/agonists , Amides/chemistry , Binding Sites , Chemistry, Pharmaceutical/methods , Drug Design , Drug Evaluation, Preclinical , Inhibitory Concentration 50 , Models, Chemical , Molecular Conformation , Stereoisomerism , Steroids/chemistryABSTRACT
Described herein is a modern approach to the rapid preparation and evaluation of compounds as potential back-up drug candidates. GW311616A, 1, a derivative of pyrrolidine trans-lactams, has previously been described as a potent, orally active inhibitor of human neutrophil elastase (HNE) for the treatment of respiratory disease. These properties made it a suitable candidate for development. Described here is the discovery of three further derivatives of pyrrolidine trans-lactams, which fulfill the criteria required for back-up candidates 28, 29, and 32. These include increased activity in inhibiting HNE in human whole blood (HWB) and comparable pharmacokinetic properties, in particular clearance, in two species. To provide a rapid assessment of clearance, cassette dosing in dog was used. Modern array techniques, including the synthesis of mixtures, were used to synthesize compounds rapidly. Having selected three potential compounds as back-up candidates, they were prepared as single enantiomers and profiled in in vitro and in vivo assays and evaluated pharmacokinetically in rat and dog. These compounds are highly potent and selective HNE inhibitors, with a prolonged pharmacodynamic action. Pharmacokinetically, these compounds are comparable with 1 while they are more potent in HWB. Compound 28, however, has a higher clearance. One of these compounds, 32, was cocrystallized with HNE, and features of this structure are described and compared with the cocrystal structure of 1 in porcine pancreatic elastase.
