Acta Neuropathologica: 在器官型脑片培养和体内,神经元活动调节α-突触核蛋白的聚集和扩散

2020-10-11 MedSci原创 MedSci原创

错误折叠的α-突触核蛋白形成被称为Lewy小体(LB)和Lewy轴突(LN)的神经元包涵体,这是帕金森病(PD)和Lewy小体痴呆(DLB)的病理特征。

错误折叠的α-突触核蛋白(αSyn)形成被称为Lewy小体(LB)和Lewy轴突(LN)的神经元包涵体,这是帕金森病(PD)和Lewy小体痴呆(DLB)的病理特征,而多系统萎缩(MSA)中的胶质细胞浆内含物(GCI)也含有纤维αSyn,但在少突胶质细胞中而不是在神经元中发现。阿尔茨海默病(AD)患者的大脑中也普遍存在αSyn病理学,而伴有αSyn病理学的神经退行性疾病通常被称为突触核蛋白病。

αSyn预制纤维(PFF)诱导内源性αSyn聚集,导致突触传递减少。神经元活动调节αSyn的释放,然而,神经元活动是否调节αSyn病理学的扩散仍然是个未知数。在这里,我们建立了野生型(WT)小鼠海马切片培养系统,发现CA3区Ca2+内流和αSyn PFF的摄取均高于CA1亚区。在αSyn PFF处理的海马或中脑切片培养中,药物增强的神经元活性显著增加了αSyn病理学改变,加速了多巴胺能神经元的退化。一直以来,神经元过度活跃促进了PFF在微流体腔内沿轴突/树突转运。出乎意料的是,增强IRRK2 G2019s突变切片培养的神经元活性进一步增加了αSyn病理学,尤其是LB的形成比WT切片培养的多。最后,在WT小鼠背侧纹状体注射αSyn PFF和化学发生调节剂后,运动行为和αSyn病理学都有可能因增强神经元活性而恶化,因为它们通过降低神经元活性而得到改善。因此,深入了解神经元活动对αSyn聚集和扩散的影响以及多巴胺能神经元的脆弱性,可能为LB病(LBD)患者提供新的治疗策略。

方法:全长人α突触(1-140)蛋白在BL21 (DE3) RIL细胞中表达,并进行纯化。将重组αSyn稀释至5 mg/mL于无菌杜尔贝科PBS(Cellgro,Mediatech;pH调节至7.0,无Ca2+或Mg2+)中,然后在37°C下以1000转持续搅拌培养7天来进行纤维化。通过电子显微镜、沉降研究和所述的硫黄素T-结合试验验证了α-合成纤维的成功。将组装好的αSyn PFF进行校准并储存在-80°C下。

综上所述,神经元活动应被视为加速人类PD患者αSyn病理学扩散的驱动力。事实上,调节神经元活动可能成为治疗突触核细胞病的一种新疗法。

Wu, Q., Shaikh, M.A., Meymand, E.S. et al. Neuronal activity modulates alpha-synuclein aggregation and spreading in organotypic brain slice cultures and in vivo. Acta Neuropathol (2020). https://doi.org/10.1007/s00401-020-02227-6

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    2021-04-11 windight
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    2020-11-17 yb6560
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