Modulation of lipopolysaccharide-induced memory insult, γ-secretase, and neuroinflammation in triple transgenic mice by 5-lipoxygenase.

Modulation of lipopolysaccharide-induced memory insult, γ-secretase, and neuroinflammation in triple transgenic mice by 5-lipoxygenase.
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DOI:
10.1016/j.neurobiolaging.2013.11.016
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发表时间:
2014-05
影响因子:
4.2
通讯作者:
Praticò D
Praticò D
中科院分区:
医学2区
文献类型:
--
作者:
Joshi YB;Giannopoulos PF;Chu J;Praticò D

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除了淀粉样蛋白和 tau 蛋白病理学之外,阿尔茨海默病 (AD) 的一个持续特征是强烈的炎症反应,这被认为是其发病机制中的一个活跃参与者。 5-脂氧合酶 (5LO) 是一种促炎酶,也是该疾病小鼠模型中 AD 样表型的内源性调节剂。为了进一步了解 5LO 在 AD 发病机制中的作用,我们将 3xTg 和 3xTg/5LO 敲除小鼠暴露于脂多糖 (LPS)(一种已知的神经炎症诱导剂),并评估其对其 AD 样表型的影响。用 LPS 治疗的 3xTg 小鼠表现出行为恶化、γ-分泌酶上调和神经炎症反应增加。这些效应在 5LO 基因缺陷的 3xTg 小鼠中被完全阻止。相比之下,缺乏 5LO 并不能防止由细胞周期蛋白依赖性激酶 5 激活介导的特定表位 tau 磷酸化增加。我们的数据表明,5LO 通路影响 AD 样表型的关键神经病理学特征(行为、Abeta、小胶质细胞增生、星形细胞增多症),但不影响 LPS 依赖性神经炎症模型中的其他特征(tau 病理学)。 5LO 在体内影响 LPS 依赖性效应的相反方式支持 AD 中神经炎症反应的复杂性质及其在调节淀粉样蛋白和 tau 神经病理学中的不同作用。
Besides amyloid and tau pathology, a constant feature of Alzheimer’s disease (AD) is an intense inflammatory response, which is considered an active player in its pathogenesis. The 5-Lipoxygenase (5LO) is a proinflammatory enzyme and an endogenous modulator of AD-like phenotype in mouse models of the disease. To further understand the role of 5LO in AD pathogenesis, we exposed the 3xTg and 3xTg/5LO knockout mice to lipopolysaccharide (LPS), a known inducer of neuroinflammation, and evaluated its effect on their AD-like phenotype. 3xTg mice treated with LPS manifested a worsening of behavior, γ-secretase up-regulation, and increased neuroinflammatory responses. These effects were completely prevented in 3xTg mice genetically deficient for 5LO. By contrast, the absence of 5LO did not protect against increase in tau phosphorylation at specific epitopes that were mediated by the activation of the cyclin-dependent kinase 5. Our data demonstrate that the 5LO pathway affects key neuropathological features of the AD-like phenotype (behavior, Abeta, microgliosis, astrocytosis) but not others (tau pathology) in the LPS-dependent neuroinflammation model. The opposite ways whereby 5LO influences the LPS-dependent effects in vivo supports the complex nature of the neuroinflammatory response in AD and its differential role in modulating amyloid and tau neuropathology.
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