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- W2076295979 abstract "Cariprazine is a novel antipsychotic drug candidate that exhibits high selectivity and affinity to dopamine D3 and D2 receptors and moderate affinity to serotonin 5-HT1A receptors. Targeting receptors other than D2 may provide a therapeutic benefit for both positive and negative symptoms associated with schizophrenia. Positron emission tomography (PET) can be used as a tool in drug development to assess the in vivo distribution and pharmacological properties of a drug. The objective of this study was to determine dopamine D2/D3 and serotonin 5-HT1A receptor occupancy in monkey brain after the administration of cariprazine. We examined three monkeys using the following PET radioligands: [11C]MNPA (an agonist at D2 and D3 receptors), [11C]raclopride (an antagonist at D2 and D3 receptors), and [11C]WAY-100635 (an antagonist at 5-HT1A receptors). During each experimental day, the first PET measurement was a baseline study, the second after a low dose of cariprazine, and the third after the administration of a high dose. We found that cariprazine occupied D2/D3 receptors in a dose-dependent and saturable manner, with the lowest dose occupying ~5% of receptors and the highest dose showing more than 90% occupancy. 5-HT1A receptor occupancy was considerably lower compared with D2/D3 occupancy at the same doses, with a maximal value of ~30% for the raphe nuclei. We conclude that cariprazine binds preferentially to dopamine D2/D3 rather than to serotonin 5-HT1A receptors in monkey brain. These findings can be used to guide the selection of cariprazine dosing in humans." @default.
- W2076295979 created "2016-06-24" @default.
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- W2076295979 date "2011-05-28" @default.
- W2076295979 modified "2023-10-03" @default.
- W2076295979 title "Occupancy of dopamine D2 and D3 and serotonin 5-HT1A receptors by the novel antipsychotic drug candidate, cariprazine (RGH-188), in monkey brain measured using positron emission tomography" @default.
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- W2076295979 doi "https://doi.org/10.1007/s00213-011-2343-z" @default.
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