Micheliolide suppresses LPS-induced neuroinflammatory responses.

Micheliolide suppresses LPS-induced neuroinflammatory responses.
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Micheliolide 抑制 LPS 诱导的神经炎症反应

DOI:
10.1371/journal.pone.0186592
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发表时间:
2017
期刊:
影响因子:
3.7
通讯作者:
Chen J
Chen J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Sun Z;Li G;Tong T;Chen J

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小胶质细胞参与的神经炎症被认为在各种神经退行性疾病中促进脑损伤。因此,抑制小胶质细胞过度活化可能对治疗神经退行性疾病具有治疗益处。含笑内酯(MCL)是一种倍半萜内酯,具有抑制多种炎症反应的作用。然而,MCL是否可以抑制LPS激活的BV 2小胶质细胞引起的神经炎症尚未被探索。在这项研究中,我们证明了用MCL处理BV 2细胞显著抑制LPS刺激的一氧化氮合酶(iNOS)和环氧合酶-2(考克斯-2)表达,以及肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL-6)和一氧化氮(NO)诱导。MCL还减弱多种促炎细胞因子和介质(如iNOS、考克斯-2、TNF-α、IL-6和IL-1β)的mRNA水平。机制研究表明,MCL抑制LPS刺激的IκBα/NF-κB通路和Akt通路的激活。MCL还能抑制LPS诱导的c-Jun N-末端激酶(JNK)、p38 MAPK激酶和细胞外信号调节激酶1/2(ERK 1/2)的活性。同时,MCL通过增强NF-E2相关因子2(Nrf 2)活性,显著促进抗氧化蛋白血红素氧合酶-1(HO-1)的表达。总之,我们的研究结果表明,MCL可能作为一种神经保护剂在神经炎症相关的神经退行性疾病。
Microglia-involved neuroinflammation is thought to promote brain damage in various neurodegenerative disorders. Thus, inhibition of microglial over-activation may have a therapeutic benefit for the treatment of neurodegenerative disorders. Micheliolide (MCL) is a sesquiterpene lactone which inhibits various inflammatory response. However, whether MCL can inhibit neuroinflammation caused by LPS-activated BV2 microglia has not yet been explored. In this study, we demonstrated that treatment of BV2 cells with MCL significantly repressed LPS-stimulated nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) expression, as well as tumor necrosis factor-alpha (TNF-α), interleukin-6 (IL-6) and nitric oxide (NO) induction. MCL also attenuated mRNA levels of multiple pro-inflammatory cytokines and mediators such as iNOS, COX-2, TNF-α, IL-6 and IL-1β. Mechanistic studies revealed that MCL suppressed LPS-stimulated the activation of IκBα/NF-κB pathway and Akt pathway. Moreover, MCL inhibited LPS-induced the activition of c-Jun N-terminal kinase (JNK), p38 MAPK kinase, and extracellular signal-regulated kinases 1/2 (ERK1/2). Meanwhile, MCL markedly promoted antioxidant protein heme oxygenase-1 (HO-1) expression by enhancing NF-E2-related factor 2 (Nrf2) activity. Together, our results imply that MCL may serve as a neuroprotective agent in neuroinflammation-related neurodegenerative disorders.
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