Cortical alpha-synuclein preformed fibrils do not affect interval timing in mice.

Cortical alpha-synuclein preformed fibrils do not affect interval timing in mice.
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DOI:
10.1016/j.neulet.2021.136273
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发表时间:
2021-11-20
影响因子:
2.5
通讯作者:
Narayanan NS
Narayanan NS
中科院分区:
医学4区
文献类型:
--
作者:
Zhang Q;Abdelmotilib H;Larson T;Keomanivong C;Conlon M;Aldridge GM;Narayanan NS

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帕金森氏病(PD)的一个显著特征是与错误折叠的α-突触核蛋白相关的路易体病理。以往的研究表明,纹状体注射α-突触核蛋白预形成的纤维(PFF)可以诱导天然α-突触核蛋白以类似蛋白的方式错误折叠和聚集,导致细胞死亡和运动功能障碍。在这里,我们测试了将α-突触核蛋白pff注射到内侧前额叶皮质是否会导致间隔计时障碍,这是一种认知任务,在人类帕金森病患者和帕金森病啮齿动物模型中受到干扰。我们将PFF或人α-突触核蛋白单体注射到预先注射了编码人α-突触核蛋白或对照蛋白过表达的腺相关病毒(AAV)的小鼠的前额叶内侧皮质。尽管存在显著的内侧前额叶皮质突触核病,但我们没有观察到固定间隔计时的一致性缺陷。这些结果表明,皮质α-突触核蛋白并不可靠地干扰固定时间间隔的计时。
One hallmark feature of Parkinson’s disease (PD) is Lewy body pathology associated with misfolded alpha-synuclein. Previous studies have shown that striatal injection of alpha-synuclein preformed fibrils (PFF) can induce misfolding and aggregation of native alpha-synuclein in a prion-like manner, leading to cell death and motor dysfunction in mouse models. Here, we tested whether alpha-synuclein PFFs injected into the medial prefrontal cortex results in deficits in interval timing, a cognitive task which is disrupted in human PD patients and in rodent models of PD. We injected PFF or monomers of human alpha-synuclein into the medial prefrontal cortex of mice pre-injected with adeno-associated virus (AAV) coding for overexpression of human alpha-synuclein or control protein. Despite notable medial prefrontal cortical synucleinopathy, we did not observe consistent deficits in fixed-interval timing. These results suggest that cortical alpha-synuclein does not reliably disrupt fixed-interval timing.
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