IPSU

Kinase experiment:

Competition experiments are performed with a single concentration of radioligand and six concentrations of competitor (unlabeled ligands; BBAC, almorexant, SB-649868, suvorexant, filorexant or IPSU). 4.6 nM [3H]-BBAC is added simultaneously with various concentrations of unlabeled ligand (0.1 nM-10 μM) to membranes (150 μL/well) in 50 μL/well of assay buffer with a total volume of 250 μL/well. The amount of [3H]-BBAC bound to receptors is determined at room temperature at different time points (ranging from 15 min to 4 h) and terminated by rapid vacuum filtration and liquid scintillation counting[2].

Animal experiment:

Mice: Freely moving C57Bl/6 mice with chronically implanted electrodes are well abituated to the experiment boxes and had access to food and ater ad libitum. The test compounds (IPSU) or vehicle are administered per os as a suspension in 0.5% methylcellulose immediately prior to lights off and start of recording. Movement is recorded using infrared sensors in the roof of the box. EEG/EMG signals and motility data are used to score 10 s epochs into wake, NREM sleep, and REM sleep. Each animal served as its own control by application and recording of vehicle the day before compound (IPSU) dosing[1].

References:

[1]. Betschart C, et al. Identification of a novel series of orexin receptor antagonists with a distinct effect on sleeparchitecture for the treatment of insomnia. J Med Chem. 2013 Oct 10;56(19):7590-607.
[2]. Callander GE, et al. Kinetic properties of "dual" orexin receptor antagonists at OX1R and OX2R orexin receptors. Front Neurosci. 2013 Dec 3;7:230.
[3]. Hoyer D, et al. Distinct effects of IPSU and suvorexant on mouse sleep architecture.