Microglial derived tumor necrosis factor-α drives Alzheimer's disease-related neuronal cell cycle events.

Microglial derived tumor necrosis factor-α drives Alzheimer's disease-related neuronal cell cycle events.
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DOI:
10.1016/j.nbd.2013.10.007
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发表时间:
2014-02
影响因子:
6.1
通讯作者:
Lamb BT
Lamb BT
中科院分区:
医学1区
文献类型:
--
作者:
Bhaskar K;Maphis N;Xu G;Varvel NH;Kokiko-Cochran ON;Weick JP;Staugaitis SM;Cardona A;Ransohoff RM;Herrup K;Lamb BT

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大量神经元丢失是阿尔茨海默病(AD)的重要病理特征。然而,其机制仍不清楚。在这里,我们证明了神经炎症,细胞自主的小胶质细胞,能够诱导神经元细胞周期事件(CCE),这对终末分化的神经元是有毒的。首先,寡聚淀粉样β蛋白(Apo)介导的小胶质细胞激活通过肿瘤坏死因子-α(Tumor-Nunction-α,TFFJNK)和c-jun Kinase(JNK)信号通路诱导神经元CCE。第二,过继转移AD转基因小鼠(R1.40)的CD11b+小胶质细胞通过肿瘤坏死因子α信号通路诱导神经元细胞周期蛋白D1的表达。第三,R1.40小鼠肿瘤坏死因子α的遗传缺陷(R1.40-肿瘤坏死因子α−/−)可诱导神经元性CCE。最后,有丝分裂活跃的神经元在空间上与F4/80+激活的小胶质细胞共存于人类AD脑中,并且这些神经元中的一部分是凋亡的。综上所述,我们的数据提示小胶质细胞的细胞自主作用,并确认肿瘤坏死因子α是在AD发病机制中促进神经元CCE的负责细胞因子。
Massive neuronal loss is a key pathological hallmark of Alzheimer’s disease (AD). However, the mechanisms are still unclear. Here we demonstrate that neuroinflammation, cell autonomous to microglia, is capable of inducing neuronal cell cycle events (CCEs), which are toxic for terminally differentiated neurons. First, oligomeric amyloid-beta peptide (ApO)-mediated microglial activation induced neuronal CCEs via the tumor-necrosis factor-α (TNFα) and the c-Jun Kinase (JNK) signaling pathway. Second, adoptive transfer of CD11b+ microglia from AD transgenic mice (R1.40) induced neuronal cyclin D1 expression via TNFα signaling pathway. Third, genetic deficiency of TNFα in R1.40 mice (R1 .40-Tnfα−/−) iled to induce neuronal CCEs. Finally, the mitotically active neurons spatially co-exist with F4/80+ activated microglia in the human AD brain and that a portion of these neurons are apoptotic. Together our data suggest a cell-autonomous role of microglia, and identify TNFα as the responsible cytokine, in promoting neuronal CCEs in the pathogenesis of AD.
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