Structure optimization of positive allosteric modulators of GABAB receptors led to the unexpected discovery of antagonists/potential negative allosteric modulators
作者:Claudia Mugnaini、Antonella Brizzi、Rafaela Mostallino、Maria Paola Castelli、Federico Corelli
DOI:10.1016/j.bmcl.2020.127443
日期:2020.9
merging approach to design new chemotypes starting from selected active compounds, such as GS39783, rac-BHFF, and BHF177, and we ended up with the synthesis of four different classes of compounds. The new compounds were tested alone or in the presence of 10 µM GABA using [35S]GTPγS binding assay to assess their functionality at the receptor. Unexpectedly, a number of them significantly inhibited GABA-stimulated
GABA B受体的正变构调节剂(PAM)代表了受体激动剂(如巴氯芬)的有趣替代物,因为它们以更生理的方式作用于受体,因此没有通常由激动剂产生的副作用。基于我们对鉴定新GABA B受体PAM的兴趣,我们遵循一种合并方法,从选定的活性化合物(例如GS39783,rac-BHFF和BHF177)开始设计新的化学型,最终合成了四种不同的类化合物。新化合物进行了测试单独或在10μMGABA的存在下,使用[ 35 S] GTP γS结合测定法评估它们在受体上的功能。出乎意料的是,它们中的许多显着抑制了GABA刺激的GTPγS结合,因此揭示了相对于原型分子的功能转换。对选定化合物的进一步研究将阐明它们是否充当受体的负调节剂,或充当正构结合位点的拮抗剂。