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The role of MS-377, a novel selective sigma1 ligand currently being developed for the treatment of schizophrenia, in modulating the activities of phencyclidine (PCP) on NMDA-induced calcium increase was examined in primary cultured neocortical neurons using calcium-imaging technique combined with a confocal laser scanning microscope. PCP significantly blocked NMDA-induced increases in intracellular calcium. The blockade by PCP of NMDA response was attenuated by both MS-377 and another highly selective sigma1 ligand, 3-PPP. The results agree with the interpretation that sigma ligands may directly or indirectly modulate NMDA receptor complex functions, and may suggest that MS-377 might be therapeutically useful in cases of PCP-induced psychosis or schizophrenia.

The selective sigma ligand MS-377 attenuates the blockade by phencyclidine of NMDA-induced intracellular calcium