Assessment of NMDA receptor inhibition of phencyclidine analogues using a high-throughput drebrin immunocytochemical assay.
Journal of pharmacological and toxicological methods September 1, 2019 Toshinari Mitsuoka, Kenji Hanamura, Noriko Koganezawa et al.
A high-throughput immunocytochemical assay using cultured rat hippocampal neurons can detect whether new psychoactive substances (NPS) inhibit NMDA receptor activity. Glutamate-induced reduction of drebrin cluster density along dendrites was competitively blocked by the NMDA receptor antagonist APV. The phencyclidine analogues PCP, 3-MeO-PCP, and 3-MeO-PCMo also antagonized the reduction, with IC50 values of 2.02 μM, 1.51 μM, and 26.67 μM respectively, indicating that 3-MeO-PCMo is less potent. The relative inhibitory potencies from IC50 values matched those from Ki values, suggesting the assay can estimate Ki for new PCP analogues without kinetic studies.