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Nigrostriatal dopaminergic deficits and hypokinesia caused by inactivation of the familial parkinsonism-linked gene DJ-1

机译:家族性帕金森病相关基因DJ-1失活导致黑质纹状体多巴胺能缺乏和运动功能减退

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摘要

The manifestations of Parkinson's disease are caused by reduced dopaminergic innervation of the striatum. Loss-of-function mutations in the DJ-1 gene cause early-onset familial parkinsonism. To investigate a possible role for DJ-1 in the dopaminergic system, we generated a mouse model bearing a germline disruption of DJ-1. Although DJ-1(-/-) mice had normal numbers of dopaminergic neurons in the substantia nigra, evoked dopamine overflow in the striatum was markedly reduced, primarily as a result of increased reuptake. Nigral neurons lacking DJ-1 were less sensitive to the inhibitory effects of D2 autoreceptor stimulation. Corticostriatal long-term potentiation was normal in medium spiny neurons of DJ-1(-/-) mice, but long-term depression (LTD) was absent. The LTD deficit was reversed by treatment with D2 but not D1 receptor agonists. Furthermore, DJ-1(-/-) mice displayed hypoactivity in the open field. Collectively, our findings suggest an essential role for DJ-1 in dopaminergic physiology and D2 receptor-mediated functions.
机译:帕金森氏病的表现是由纹状体的多巴胺能神经支配减少引起的。 DJ-1基因的功能丧失突变引起早发的家族性帕金森病。为了研究DJ-1在多巴胺能系统中的可能作用,我们生成了带有DJ-1种系破坏的小鼠模型。尽管DJ-1(-/-)小鼠黑质中的多巴胺能神经元数量正常,但纹状体中诱发的多巴胺溢流明显减少,这主要是由于重摄取增加所致。缺乏DJ-1的黑质神经元对D2自身受体刺激的抑制作用较不敏感。在DJ-1(-/-)小鼠的中棘神经元中,皮层皮质长期增强作用是正常的,但没有长期抑制(LTD)。通过用D2而非D1受体激动剂治疗可以逆转LTD缺乏症。此外,DJ-1(-/-)小鼠在开阔的田野中表现出机能减退。总的来说,我们的发现表明DJ-1在多巴胺能生理和D2受体介导的功能中起着至关重要的作用。

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