β-arrestin1

Barbadin is a novel and specific inhibitor of β-arrestin/β2-adaptin interaction with an IC50 value of 19.1 μM for β-arestin1 and 15.6 μM for β-arestin2. Barbadin potentiates the long term effects of lorcaserin on POMC neurons and weight loss. Barbadin potentiates the long-term effects of lorcaserin on POMC neurons and weight loss, blocks agonist-promoted endocytosis of prototypic β2-adrenergic, V2-vasopressin, and angiotensin-II-1 receptors, and may be useful in the study of obesity.

MP1202 is a dual agonist for MOR and KOR, with EC50 values of 0.32 μM for mMOR-1 and 0.13 μM for mKOR-1. It exhibits functional selectivity by reducing β-arrestin1/2 recruitment in hMOR and hKOR while significantly activating G protein and Gα subtypes. In opioid receptor subtype knockout mouse models, MP1202 demonstrates potent antinociceptive effects without typical opioid side effects, albeit it induces conditioned place preference and aversion behaviors, indicating potential for analgesic research.

RKN5755 is a selective activated fibroblasts inhibitor that acts by inhibiting the enhanced migration of fibroblasts cocultured with cancer cells by binding to β-arrestin1 and interfering with β-arrestin1-mediated cofilin signaling pathways.