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• W2028418645 abstract "Dopamine D2 receptors (D2R) are the primary target of antipsychotic drugs and have been shown to regulate Akt/glycogen synthase kinase-3β (GSK-3β) signaling through scaffolding protein β-arrestin 2. Amisulpride, an atypical antipsychotic drug, and haloperidol, a typical antipsychotic drug, are both potent D2R antagonists, but their therapeutic effects differ. In the present study, we compared the effects of amisulpride and haloperidol on the β-arrestin 2-mediated Akt/GSK-3β pathway in SH-SY5Y cells. To determine whether these drugs affected neuronal morphology in SH-SY5Y cells, we investigated the effects of amisulpride and haloperidol on neurite outgrowth using immunostaining. We examined the effects of these drugs on Akt and GSK-3β and its well-known downstream regulators, cAMP response element-binding protein (CREB), brain-derived neurotrophic factor (BDNF), and Bcl-2 levels using Western blot analysis. Amisulpride, but not haloperidol, was found to enhance neurite outgrowth. Small interfering RNA (siRNA) for β-arrestin 2 knockdown blocked the increase in amisulpride-induced neurite outgrowth. Furthermore, amisulpride increased the levels of Akt and GSK-3β phosphorylation, while haloperidol had no effect. The elevation of Akt phosphorylation induced by amisulpride was reduced by β-arrestin 2 siRNA. Moreover, amisulpride effectively increased the levels of phospho-CREB, BDNF, and Bcl-2. However, haloperidol had no effect on the levels of these proteins. Additionally, wortmannin, a phosphatidylinositol 3-kinase (PI3 K) inhibitor, blocked the stimulatory effect of amisulpride on phosphorylated Akt. Together, these results suggest that regulation of the β-arrestin 2-dependent pathway via blockade of the D2R in SH-SY5Y cells is one mechanism underlying the neuroprotective effect of amisulpride, but not haloperidol." @default.
• W2028418645 created "2016-06-24" @default.
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• W2028418645 date "2011-09-01" @default.
• W2028418645 modified "2023-10-15" @default.
• W2028418645 title "Differential effects of amisulpride and haloperidol on dopamine D2 receptor-mediated signaling in SH-SY5Y cells" @default.
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• W2028418645 doi "https://doi.org/10.1016/j.neuropharm.2011.05.022" @default.
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