Oleuropein Prevents Neuronal Death, Mitigates Mitochondrial Superoxide Production and Modulates Autophagy in a Dopaminergic Cellular Model.

Oleuropein Prevents Neuronal Death, Mitigates Mitochondrial Superoxide Production and Modulates Autophagy in a Dopaminergic Cellular Model.
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DOI:
10.3390/ijms17081293
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发表时间:
2016-08-09
影响因子:
5.6
通讯作者:
Martinoli MG
Martinoli MG
中科院分区:
生物学2区
文献类型:
--
作者:
Achour I;Arel-Dubeau AM;Renaud J;Legrand M;Attard E;Germain M;Martinoli MG

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帕金森病(PD)是一种进行性神经退行性疾病,主要影响黑质中的多巴胺能神经元。目前帕金森病尚无治愈方法,目前的药物旨在缓解临床症状,因此预防仍是降低该病患病率的理想策略。本研究的目的是研究橄榄衍生物中的主要酚类化合物橄榄苷(OLE)是否可以防止帕金森毒素6-羟基多巴胺(6-OHDA)作用下分化的PC12细胞的多巴胺能神经元变性。我们还研究了OLE减轻线粒体氧化应激和调节自噬通量的能力。我们通过测量细胞毒性和凋亡事件获得的结果表明,OLE显著减少神经元死亡。OLE还可通过抑制超氧化物歧化酶活性而减少线粒体产生的活性氧物种。此外,对细胞质中自噬小泡和酸性小泡的定量以及特定自噬标记的表达揭示了OLE对巴菲罗星A1诱导的自噬通量损伤的调节作用。总之,我们的结果将OLE定义为神经元多巴胺能细胞模型中的一种神经保护、抗氧化和自噬调节分子。
Parkinson’s disease (PD) is a progressive neurodegenerative disorder, primarily affecting dopaminergic neurons in the substantia nigra. There is currently no cure for PD and present medications aim to alleviate clinical symptoms, thus prevention remains the ideal strategy to reduce the prevalence of this disease. The goal of this study was to investigate whether oleuropein (OLE), the major phenolic compound in olive derivatives, may prevent neuronal degeneration in a cellular dopaminergic model of PD, differentiated PC12 cells exposed to the potent parkinsonian toxin 6-hydroxydopamine (6-OHDA). We also investigated OLE’s ability to mitigate mitochondrial oxidative stress and modulate the autophagic flux. Our results obtained by measuring cytotoxicity and apoptotic events demonstrate that OLE significantly decreases neuronal death. OLE could also reduce mitochondrial production of reactive oxygen species resulting from blocking superoxide dismutase activity. Moreover, quantification of autophagic and acidic vesicles in the cytoplasm alongside expression of specific autophagic markers uncovered a regulatory role for OLE against autophagic flux impairment induced by bafilomycin A1. Altogether, our results define OLE as a neuroprotective, anti-oxidative and autophagy-regulating molecule, in a neuronal dopaminergic cellular model.
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