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• W2020096098 abstract "Abstract Activation of dopamine D 2 receptors ( D 2 R ) modulates G protein/ cAMP ‐dependent signaling and also engages Akt ‐ GSK‐3 signaling through D 2 R / β ‐arrestin 2 scaffolding of Akt and PP2A . This G protein‐independent pathway may be important in mediating the antimanic effects of mood stabilizers and antipsychotics. The mood stabilizer lithium influences behavior and Akt / GSK‐3 signaling in mice and many antipsychotics have been shown to more potently antagonize the activity of the β ‐arrestin‐2 pathway relative to the G protein‐dependent pathway. Cariprazine, an antipsychotic with potent D 3 R / D 2 R partial agonist activity and preferential binding to D 3 R , was investigated for its effects on the mediators of D 2 R pathways in vitro and its efficacy in animal models of mania. Effects on G protein‐dependent activity were measured via inhibition of isoproterenol‐induced cAMP production; effects on D 2 R / β ‐arrestin 2 signaling were determined using bioluminescence resonance energy transfer ( BRET ). Cariprazine was tested in vivo for antimanic‐like activity, using the ouabain‐induced hyperactivity model in rats. Cariprazine was more potent than aripiprazole in inhibiting isoproterenol‐induced cAMP although both compounds showed similar maximum efficacy. In assays of D 2 R / β ‐arrestin 2‐dependent interactions, cariprazine showed very weak partial agonist activity, unless the levels of receptor kinase were increased; as an antagonist it showed similar potency to haloperidol and ~fivefold greater potency than aripiprazole. In an animal model of mania, cariprazine showed similar efficacy as lithium in attenuating the effects of ouabain‐induced hyperactivity. In summary, the differential effects of cariprazine on D 2 R G protein and β ‐arrestin 2 mediators of signal transduction pathways could contribute to its potent antimanic‐like activity." @default.
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• W2020096098 date "2014-12-02" @default.
• W2020096098 modified "2023-10-17" @default.
• W2020096098 title "Cariprazine exerts antimanic properties and interferes with dopamine D ₂ receptor <i>β</i> ‐arrestin interactions" @default.
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• W2020096098 doi "https://doi.org/10.1002/prp2.73" @default.
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