Rhinacanthin C Alleviates Amyloid-β Fibrils' Toxicity on Neurons and Attenuates Neuroinflammation Triggered by LPS, Amyloid-β, and Interferon-γ in Glial Cells.

Rhinacanthin C Alleviates Amyloid-β Fibrils' Toxicity on Neurons and Attenuates Neuroinflammation Triggered by LPS, Amyloid-β, and Interferon-γ in Glial Cells.
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DOI:
10.1155/2017/5414297
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发表时间:
2017
影响因子:
--
通讯作者:
Wen SF
Wen SF
中科院分区:
生物学2区
文献类型:
--
作者:
Chuang KA;Li MH;Lin NH;Chang CH;Lu IH;Pan IH;Takahashi T;Perng MD;Wen SF

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神经炎症在阿尔茨海默病(AD)的病理生理学中起着核心作用。抑制神经炎症的化合物已被确定为阿尔茨海默病的潜在治疗靶点。犀牛毒素C(Rhinacantin C,RC)是刺五加属植物中的一种萘醌类化合物,目前被认为是一种有效的抗炎分子。然而,RC在神经炎症中的确切作用仍有待阐明。在本研究中,我们研究了RC对内毒素、淀粉样蛋白-β肽(A-β)或干扰素-γ-(干扰素-γ-)诱导的神经元和神经胶质细胞病理事件的调节作用。我们的研究结果表明,RC可预防A-β对大鼠海马神经元的毒性作用,并能抑制脂多糖激活的一氧化氮合酶(NO)的产生、诱导型一氧化氮合酶(INOS)的表达和大鼠神经胶质细胞的NF-κB信号转导。同样,RC通过减少大鼠小胶质细胞一氧化氮的产生和诱导型一氧化氮合酶、IL-1β、CCl-2和CCl-5mRNA的表达而抑制内毒素诱导的神经炎症。BV-2小胶质细胞的进一步研究表明,RC抑制内毒素、Aβ和干扰素γ刺激的IL-6和肿瘤坏死因子-α的分泌。值得注意的是,在BV-2细胞对Aκ或β-γ的反应中,核因子-ERKB和ERK1的激活被RC取消。此外,RC可保护神经元免受Aβ刺激的小胶质细胞条件性介质依赖毒性。总而言之,这些数据突出了RC在神经保护方面的有益作用,并支持RC对神经炎症介导的条件的治疗意义。
Neuroinflammation plays a central role in the pathophysiology of Alzheimer's disease (AD). Compounds that suppress neuroinflammation have been identified as potential therapeutic targets for AD. Rhinacanthin C (RC), a naphthoquinone ester found in Rhinacanthus nasutus Kurz (Acanthaceae), is currently proposed as an effective molecule against inflammation. However, the exact role of RC on neuroinflammation remains to be elucidated. In the present study, we investigated RC effect on modulating lipopolysaccharides (LPS), amyloid-β peptide (Aβ), or interferon-γ- (IFN-γ-) evoked pathological events in neurons and glia. Our findings demonstrated that RC prevented Aβ-induced toxicity in rat hippocampal neurons and attenuated LPS-activated nitric oxide (NO) production, inducible nitric oxide synthase (iNOS) expression, and NF-κB signaling in rat glia. Likewise, RC suppressed LPS-induced neuroinflammation by reducing NO production and iNOS, IL-1β, CCL-2, and CCL-5 mRNA levels in rat microglia. Further studies using BV-2 microglia revealed that RC inhibited LPS-, Aβ-, and IFN-γ-stimulated IL-6 and TNF-α secretion. Of note, NF-κB and ERK activation was abrogated by RC in BV-2 cell response to Aβ or IFN-γ. Moreover, RC protected neurons from Aβ-stimulated microglial conditioned media-dependent toxicity. Collectively, these data highlight the beneficial effects of RC on neuroprotection and support the therapeutic implications of RC to neuroinflammation-mediated conditions.
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