444932-31-4Relevant articles and documents
Radiosynthesis and characterisation of a potent and selective GPR139 agonist radioligand
Kuhne, Sebastiaan,N?hr, Anne Cathrine,Marek, Ale?,Elbert, Tomá?,Klein, Anders Bue,Br?uner-Osborne, Hans,Wellendorph, Petrine,Pedersen, Daniel Sejer
, p. 947 - 952 (2016/01/15)
Compound 1 is a selective and potent agonist of the G protein-coupled receptor GPR139 (EC50 = 39 nM). In this study, we describe the synthesis, radiolabelling and in vitro evaluation of [3H]-1 for the characterisation of GPR139 and its spatial expression in the brain using autoradiography. Two different synthesis routes for the radiolabelling of 1 based on a reductive debromination strategy were investigated using deuterium (D2, g). The route based on reductive debromination of the bromonaphthyl precursor 5 proved superior over arylbromide 4 and was employed for the radiolabelling experiments. Reductive debromination of precursor 5 was accomplished using 3H2, Pd/C and triethylamine in DMF at ambient temperature to give target molecule [3H]-1 with a specific activity of 19.3 Ci mmol-1 and a radiochemical purity of ≥95%. By application of autoradiography and binding studies, it was not possible to discriminate [3H]-1 binding to wildtype mice brains from GPR139 knockout mice brains and total binding from non-specific binding in CHO-k1 cells stably expressing human GPR139 receptor. Based on these experiments we conclude that [3H]-1 is not a suitable radioligand for the characterisation of GPR139.
Discovery and SAR of a series of agonists at orphan G protein-coupled receptor 139
Shi, Feng,Shen, Jing Kang,Chen, Danqi,Fog, Karina,Thirstrup, Kenneth,Hentzer, Morten,Karlsson, Jens-Jakob,Menon, Veena,Jones, Kenneth A.,Smith, Kelli E.,Smith, Garrick
scheme or table, p. 303 - 306 (2011/06/21)
GPR139 is an orphan G-protein coupled receptor (GPCR) which is primarily expressed in the central nervous system (CNS). In order to explore the biological function of this receptor, selective tool compounds are required. A screening campaign identified compound 1a as a high potency GPR139 agonist with an EC50 = 39 nM in a calcium mobilization assay in CHO-K1 cells stably expressing the GPR139 receptor. In the absence of a known endogenous ligand, the maximum effect was set as 100% for 1a. Screening against 90 diverse targets revealed no cross-reactivity issues. Assessment of the pharmacokinetic properties showed limited utility as in vivo tool compound in rat with a poor whole brain exposure of 61 ng/g and a brain/plasma (b/p) ratio of 0.03. Attempts to identify a more suitable analogue identified the des-nitrogen analogue 1s with a reduced polar surface area of 76.7 A2 and an improved b/p ratio of 2.8. The whole brain exposure remained low at 95 ng/g due to a low plasma exposure.