Supersensitive presynaptic dopamine D2 receptor inhibition of the striatopallidal projection in nigrostriatal dopamine-deficient mice.

Supersensitive presynaptic dopamine D2 receptor inhibition of the striatopallidal projection in nigrostriatal dopamine-deficient mice.
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超敏突触前多巴胺 D2 受体抑制黑质纹状体多巴胺缺陷小鼠的纹状体苍白球投射。

DOI:
10.1152/jn.00161.2013
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发表时间:
2013
影响因子:
2.5
通讯作者:
Zhou,Fu-Ming
Zhou,Fu-Ming
中科院分区:
医学3区
文献类型:
--
作者:
Wei,Wei;Li,Li;Yu,Guoliang;Ding,Shengyuan;Li,Chengyao;Zhou,Fu-Ming

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纹状体表达多巴胺(DA)D2受体(D2R)的中棘神经元(D2-MSN)投射并抑制苍白球(GP)内的GABA能神经元,构成了基底节运动控制回路间接通路的重要环节。这些纹状体延髓轴突终末表达突触前D2Rs,抑制GABA的释放,从而调节基底节的功能。在此,我们发现,在转录因子Pitx3基因突变小鼠中,模拟帕金森病(PD)中DA失神经的背侧纹状体DA严重缺失,纹状体GABA能突触传递对突触前D2R介导的抑制显示出更高的敏感性,剂量-反应曲线左移,尽管最大抑制没有改变。在功能上,与野生型小鼠相比,低浓度的DA能更有效地减少纹状体苍白素抑制诱导的突变型小鼠的GP神经元活动暂停。这些结果表明,DA丢失后,突触前D2R抑制纹状体苍白质突触变得超敏感。这些超敏感的D2R可能弥补了帕金森病患者DA的丢失,并对GP神经元的活动产生了强烈的去抑制作用,这可能与多巴胺能治疗对帕金森病患者的运动刺激作用有关。
The dopamine (DA) D2 receptor (D2R)-expressing medium spiny neurons (D2-MSNs) in the striatum project to and inhibit the GABAergic neurons in the globus pallidus (GP), forming an important link in the indirect pathway of the basal ganglia movement control circuit. These striatopallidal axon terminals express presynaptic D2Rs that inhibit GABA release and thus regulate basal ganglion function. Here we show that in transcription factor Pitx3 gene mutant mice with a severe DA loss in the dorsal striatum mimicking the DA denervation in Parkinson's disease (PD), the striatopallidal GABAergic synaptic transmission displayed a heightened sensitivity to presynaptic D2R-mediated inhibition with the dose-response curve shifted to the left, although the maximal inhibition was not changed. Functionally, low concentrations of DA were able to more efficaciously reduce the striatopallidal inhibition-induced pauses of GP neuron activity in DA-deficient Pitx3 mutant mice than in wild-type mice. These results demonstrate that presynaptic D2R inhibition of the striatopallidal synapse becomes supersensitized after DA loss. These supersensitive D2Rs may compensate for the lost DA in PD and also induce a strong disinhibition of GP neuron activity that may contribute to the motor-stimulating effects of dopaminergic treatments in PD.
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