Cell type-specific regulation of DARPP-32 phosphorylation by psychostimulant and antipsychotic drugs.

Cell type-specific regulation of DARPP-32 phosphorylation by psychostimulant and antipsychotic drugs.
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DOI:
10.1038/nn.2153
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发表时间:
2008-08
影响因子:
25
通讯作者:
Greengard, Paul
Greengard, Paul
中科院分区:
医学1区
文献类型:
--
作者:
Bateup, Helen S.;Svenningsson, Per;Kuroiwa, Mahomi;Gong, Shiaoching;Nishi, Akinori;Heintz, Nathaniel;Greengard, Paul

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DARPP-32是一种双功能蛋白激酶/磷酸酶抑制剂,在纹状体信号传导中起重要作用。DARPP-32在T34的磷酸化对于介导精神兴奋剂和抗精神病药物的作用是必不可少的;然而,已知这些药物具有相反的行为和临床作用。我们假设,这些药物对纹状体黑质和纹状体苍白球神经元,其中包括不同的输出通路的基底神经节发挥不同的作用。为了直接测试这一想法,我们开发了新的BAC转基因小鼠,其允许在纹状体黑质和纹状体苍白球神经元中选择性地分析DARPP-32磷酸化。使用这种新的方法,我们表明,可卡因,一种精神兴奋剂,氟哌啶醇,镇静产生抗精神病药,在两个神经元群体的DARPP-32磷酸化,可以解释其相反的行为效应发挥不同的作用。此外,我们发现,多种靶向纹状体的药物具有细胞类型特异性作用,这是以前的方法无法辨别的。
DARPP-32 is a dual function protein kinase/phosphatase inhibitor which plays a vital role in striatal signaling. The phosphorylation of DARPP-32 at T34 is essential for mediating the effects of both psychostimulant and antipsychotic drugs; however these drugs are known to have opposing behavioral and clinical effects. We hypothesized that these drugs exert differential effects on striatonigral and striatopallidal neurons which comprise distinct output pathways of the basal ganglia. To directly test this idea, we developed novel BAC transgenic mice which allow analysis of DARPP-32 phosphorylation selectively in striatonigral and striatopallidal neurons. Using this new methodology we show that cocaine, a psychostimulant, and haloperidol, a sedation-producing antipsychotic, exert differential effects on DARPP-32 phosphorylation in the two neuronal populations which can explain their opposing behavioral effects. Furthermore, we find that a variety of drugs that target the striatum have cell-type specific effects which previous methods were not able to discern.
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