Tenuigenin protects dopaminergic neurons from inflammation via suppressing NLRP3 inflammasome activation in microglia.

Tenuigenin protects dopaminergic neurons from inflammation via suppressing NLRP3 inflammasome activation in microglia.
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Tenuigenin通过抑制小胶质细胞中NLRP 3炎性体活化来保护多巴胺能神经元免受炎症。

DOI:
10.1186/s12974-017-1036-x
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发表时间:
2017-12-20
影响因子:
9.3
通讯作者:
Wang X
Wang X
中科院分区:
医学1区
文献类型:
--
作者:
Fan Z;Liang Z;Yang H;Pan Y;Zheng Y;Wang X

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越来越多的证据表明,炎症小体诱导的炎症反应在帕金森病(PD)的发病机制中起着至关重要的作用。因此,抑制NLRP 3炎性体活化可在治疗PD中提供治疗益处。远志皂苷元是远志的主要活性成分,具有潜在的抗炎活性,但其作用机制尚不清楚。本研究通过建立1-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)诱导的PD小鼠模型,探讨远志皂苷元对黑质多巴胺能神经元的影响。接下来,我们在BV 2小胶质细胞和成年小鼠中激活NLRP 3炎性体,以研究tenuigenin的神经保护作用的机制。我们证明了用tenuigenin治疗增加纹状体多巴胺能水平并改善MPTP诱导的运动障碍。此外,tenuigenin显着改善MPTP小鼠模型黑质多巴胺能神经元的变性和抑制NLRP 3炎性小体的激活。我们进一步发现,在BV 2小胶质细胞中,tenuigenin减少细胞内活性氧(ROS)的产生,并抑制NLRP 3炎性小体活化,随后的半胱天冬酶-1切割和白细胞介素-1 β分泌。这些数据表明,tenuigenin通过下调ROS抑制NLRP 3炎性体的活化。相应地,体内数据显示,tenuigenin通过抑制NLRP 3炎性体来减弱黑质中由脂多糖(LPS)诱导的小胶质细胞活化。我们的研究结果表明,tenuigenin保护多巴胺能神经元免受炎症部分通过抑制NLRP 3炎性小体激活的小胶质细胞,并建议有前途的临床使用tenuigenin PD治疗。
Emerging evidence indicates that nod-like receptor family, pyrin domain-containing 3 (NLRP3) inflammasome-induced inflammation plays a crucial role in the pathogenesis of Parkinson’s disease (PD). Thus, inhibition of NLRP3 inflammasome activation may offer a therapeutic benefit in the treatment of PD. Tenuigenin, a major active component of Polygala tenuifolia, has been shown to have potential anti-inflammatory activity, but the underlying mechanisms remain obscure. In the present study, the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced mouse model of PD was established to explore the effect of tenuigenin on dopaminergic neurons in substantia nigra. We next activated NLRP3 inflammasome in both BV2 microglia cells and adult mice to investigate the mechanisms for the neuroprotective effect of tenuigenin. We demonstrated that treatment with tenuigenin increased striatal dopaminergic levels and improved motor impairment induced by MPTP. Also, tenuigenin significantly ameliorated the degeneration of dopaminergic neurons and inhibited NLRP3 inflammasome activation in substantia nigra of MPTP mouse model. We further found that tenuigenin reduced intracellular reactive oxygen species (ROS) production and suppressed NLRP3 inflammasome activation, subsequent caspase-1 cleavage, and interleukin-1β secretion in BV2 microglia cells. These data indicate that tenuigenin inhibits the activation of NLRP3 inflammasome via downregulating ROS. Correspondingly, in vivo data showed that tenuigenin attenuates microglia activation induced by lipopolysaccharide (LPS) in substantia nigra via suppressing NLRP3 inflammasome. Our findings reveal that tenuigenin protects dopaminergic neurons from inflammation partly through inhibition of NLRP3 inflammasome activation in microglia, and suggest the promising clinical use of tenuigenin for PD therapy.
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