Abstract
Rationale
Since the hypofunction of the N-methyl-D-aspartate (NMDA) receptor is known to be involved in the pathophysiology of schizophrenia, the enhancement of NMDA receptor function through glycine modulatory sites is expected to be a useful approach for the treatment of schizophrenia.
Objectives
We investigated the efficacy of a glycine transporter 1 (GlyT1) inhibitor that potentiates NMDA receptor function by increasing synaptic glycine levels in animal models for cognitive dysfunction and negative symptoms, both of which are poorly managed by current antipsychotics.
Results
A newly synthesized GlyT1 inhibitor, 3-chloro-N-{(S)-[3-(1-ethyl-1H-pyrazol-4-yl)phenyl][(2S)-piperidin-2-yl]methyl}-4-(trifluoromethyl)pyridine-2-carboxamide (TASP0315003) significantly improved cognitive deficit induced by MK-801 in the object recognition test in rats. Likewise, TASP0315003 significantly improved MK-801 impaired cognition in the social recognition test in rats and also enhanced social memory in treatment-naïve rats. In addition, repeated phencyclidine (PCP) treatment reduced the social interaction of paired mice, which may reflect negative symptoms such as social withdrawal, and both acute and sub-chronic treatment with TASP0315003 reversed the reduction in social interaction induced by PCP. Moreover, TASP0315003 additionally exhibited an antidepressant effect in the forced swimming test in rats. In contrast, TASP0315003 did not affect spontaneous locomotor activity or rotarod performance and did not induce catalepsy, indicating that TASP0315003 does not cause sedation or motor dysfunction, which is sometimes observed with the use of current antipsychotics.
Conclusions
These results suggest that GlyT1 inhibitors including TASP0315003 may be useful for the treatment of cognitive dysfunction and the negative symptoms of schizophrenia without having undesirable central nervous system side effects.
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Chaki, S., Shimazaki, T., Karasawa, Ji. et al. Efficacy of a glycine transporter 1 inhibitor TASP0315003 in animal models of cognitive dysfunction and negative symptoms of schizophrenia. Psychopharmacology 232, 2849–2861 (2015). https://doi.org/10.1007/s00213-015-3920-3
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DOI: https://doi.org/10.1007/s00213-015-3920-3