Identification of Drug-Like Inhibitors of Insulin-Regulated Aminopeptidase Through Small-Molecule Screening
2016 (English)In: Assay and drug development technologies, ISSN 1540-658X, E-ISSN 1557-8127, Vol. 14, no 3, 180-193 p.Article in journal (Refereed) PublishedText
Intracerebroventricular injection of angiotensin IV, a ligand of insulin-regulated aminopeptidase (IRAP), has been shown to improve cognitive functions in several animal models. Consequently, IRAP is considered a potential target for treatment of cognitive disorders. To identify nonpeptidic IRAP inhibitors, we adapted an established enzymatic assay based on membrane preparations from Chinese hamster ovary cells and a synthetic peptide-like substrate for high-throughput screening purposes. The 384-well microplate-based absorbance assay was used to screen a diverse set of 10,500 compounds for their inhibitory capacity of IRAP. The assay performance was robust with Z-values ranging from 0.81 to 0.91, and the screen resulted in 23 compounds that displayed greater than 60% inhibition at a compound concentration of 10M. After hit confirmation experiments, purity analysis, and promiscuity investigations, three structurally different compounds were considered particularly interesting as starting points for the development of small-molecule-based IRAP inhibitors. After resynthesis, all three compounds confirmed low M activity and were shown to be rapidly reversible. Additional characterization included activity in a fluorescence-based orthogonal assay and in the presence of a nonionic detergent and a reducing agent, respectively. Importantly, the characterized compounds also showed inhibition of the human ortholog, prompting our further interest in these novel IRAP inhibitors.
Place, publisher, year, edition, pages
2016. Vol. 14, no 3, 180-193 p.
IdentifiersURN: urn:nbn:se:uu:diva-297122DOI: 10.1089/adt.2016.708ISI: 000374641700005PubMedID: 27078680OAI: oai:DiVA.org:uu-297122DiVA: diva2:941150
FunderThe Karolinska Institutet's Research FoundationScience for Life Laboratory - a national resource center for high-throughput molecular bioscienceSwedish Research Council