Autophagic impairment contributes to systemic inflammation-induced dopaminergic neuron loss in the midbrain.

Autophagic impairment contributes to systemic inflammation-induced dopaminergic neuron loss in the midbrain.
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自噬损伤导致中脑系统性炎症引起的多巴胺能神经元损失

DOI:
10.1371/journal.pone.0070472
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Liu CF
Liu CF
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zheng HF;Yang YP;Hu LF;Wang MX;Wang F;Cao LD;Li D;Mao CJ;Xiong KP;Wang JD;Liu CF

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神经炎症在帕金森病 (PD) 的发病机制中发挥着重要作用,可诱导和加速多巴胺能 (DA) 神经元损失。自噬是清除错误折叠或聚集蛋白质(例如 α-突触核蛋白 (α-SYN))的关键机制,可能会影响中脑 DA 神经元的存活。然而,自噬是否会导致 DA 神经元的神经炎症诱导的毒性仍然未知。观察到,向年轻(3 个月大)和老年(16 个月大)雄性 C57BL/6J 小鼠腹腔注射脂多糖(LPS,5 mg/kg)会引起持续性神经炎症,该炎症与 DA 神经元的延迟和进行性损失以及中脑中 α-SYN 的积累有关。自噬底物-p62 (SQSTM1) 持续增加,而 LC3-II 和 HDAC6 表现出早期增加然后下降。体外研究进一步证明TNF-α可诱导PC12细胞死亡。此外,亚致死剂量的 TNF-α (50 ng/ml) 增加了 LC3-II、p62 和 α-SYN 的表达,这表明 TNF-α 引发了细胞自噬损伤。神经炎症可能会导致自噬损伤,进而导致中脑 DA 神经元变性。
Neuroinflammation plays an important role in the pathogenesis of Parkinson’s disease (PD), inducing and accelerating dopaminergic (DA) neuron loss. Autophagy, a critical mechanism for clearing misfolded or aggregated proteins such as α-synuclein (α-SYN), may affect DA neuron survival in the midbrain. However, whether autophagy contributes to neuroinflammation-induced toxicity in DA neurons remains unknown. Intraperitoneal injection of lipopolysaccharide (LPS, 5 mg/kg) into young (3-month-old) and aged (16-month-old) male C57BL/6J mice was observed to cause persistent neuroinflammation that was associated with a delayed and progressive loss of DA neurons and accumulation of α-SYN in the midbrain. The autophagic substrate-p62 (SQSTM1) persistently increased, whereas LC3-II and HDAC6 exhibited early increases followed by a decline. In vitro studies further demonstrated that TNF-α induced cell death in PC12 cells. Moreover, a sublethal dose of TNF-α (50 ng/ml) increased the expression of LC3-II, p62, and α-SYN, implying that TNF-α triggered autophagic impairment in cells. Neuroinflammation may cause autophagic impairment, which could in turn result in DA neuron degeneration in midbrain.
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