gpr18/gpr55

Anandamide ((5Z,8Z,11Z,14Z)-N-(2-Hydroxyethyl)icosa-5,8,11,14-tetraenamide) 是一种免疫调节剂，通过大麻素受体 CB1 和 CB2 起作用，还通过中枢神经系统中的其他靶点起作用，如 GPR18 GPR55。

PSB-KD477 is an Agonist of the Cannabinoid-Activated Orphan G-Protein-Coupled Receptor GPR18. PSB-KD477 displayed significantly higher potency and efficacy than THC, determined in a GPR18-dependent β-arrestin recruitment assay, and were found to be selective versus the CB-sensitive receptors CB1, CB2, and GPR55. Structure-activity relationships were steep, and indole substitution was crucial for biological activity. These first selective agonists, which are structurally distinct from the lipidic agonist(s), will allow target validation studies and may eventually contribute to the deorphanization of GPR18.

PSB-KK1445 作为一种选择性高的GPR18激动剂，展示出对人类和小鼠GPR18的高亲和性，其EC50值分别为45.4 nM及124 nM。此外，PSB-KK1445对GPR55和GPR183这两种CB受体亚型的选择性，超过200倍。