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激活D2类多巴胺受体可以改善PPT1KI小鼠的神经网络和认知功能

Jun-Qiang Zhao^1,2, Bing-Yan Feng¹, Zhen-Li Ye³

¹First Affiliated Hospital of Xinxiang Medical University, Xinxiang, 435000, China.

Acta pharmacologica Sinica

|September 16, 2024

概括

在小鼠模型中,棕基蛋白硫酶1 (PPT1) 缺乏会损害大脑功能. 激活多巴胺D2类受体,特别是DR2和DR4,改善了认知和运动缺陷,这表明神经元状脂症的治疗标.

科学领域:

神经科学是一个神经科学.
生物化学生物化学
遗传学遗传学是一个

背景情况:

棕基蛋白硫酶1 (PPT1) 缺乏导致婴儿神经元状脂症 (INCL),一种神经退行性疾病.
PPT1突变导致 lysosomal 降解受损和渐进的神经元损伤.
以前的研究表明,在缺乏PPT1的小鼠中,海马的马振荡受损.

研究的目的:

调查PPT1-缺陷小鼠 (PPT1-KI) 中多巴胺受体 (DR) 表达变化的研究.
评估多巴胺和DR激动剂对PPT1-KI小鼠神经网络活动,认知和运动功能的影响.
探索INCL.的潜在治疗点.

主要方法:

通过Y迷宫,新型物体识别和旋转棒测试来评估认知和运动功能.
催生并记录在脑部切片中的海马玛振荡.
通过免疫细胞化学和免疫沉分析多巴胺受体表达.
评估了多巴胺和DR激动剂 (quinpirole,A412997) 的作用.

主要成果:

PPT1-KI小鼠在马振荡,记忆力和运动功能方面呈现逐渐减弱.
观察到异常DR表达:DR4增加,DR2减少,DR1/DR3保持.
PPT1与DR4和DR2相互作用.
多巴胺,昆皮醇和A412997在很大程度上恢复了马振荡和认知缺陷.
A412997治疗增加了PPT1-KI小鼠的海马体CaMKII活性.

结论:

激活D2类多巴胺受体 (DR2,DR4) 改善了PPT1-KI小鼠的认知和网络活动障碍.
特定的DR子单位代表INCL和相关的神经退行性疾病的潜在治疗点.
恢复 lysosomal 功能和调节多巴胺基通路可能提供双重治疗策略.

关键词:

认知功能认知功能多巴胺是多巴胺的一种.多巴胺D4受体的受体婴儿神经神经状体脂素症棕酸-蛋白质化酶1 1 γ 振荡的振荡

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Long-term Potentiation

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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.

Long-term Potentiation

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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