COX-2 metabolic products, the prostaglandin I(2) and F(2α), mediate the effects of TNF-α and Zn(2+) in stimulating the phosphorylation of Tau.

COX-2 metabolic products, the prostaglandin I(2) and F(2α), mediate the effects of TNF-α and Zn(2+) in stimulating the phosphorylation of Tau.
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COX-2 代谢产物前列腺素 I2 和 F2α 介导 TNF-α 和 Zn(2 ) 刺激 Tau 磷酸化的作用。

DOI:
10.18632/oncotarget.21853
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发表时间:
2017-11-21
期刊:
影响因子:
--
通讯作者:
Wang P
Wang P
中科院分区:
其他
文献类型:
--
作者:
Wang Y;Guan PP;Yu X;Guo YS;Zhang YJ;Wang ZY;Wang P

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尽管环氧化酶-2(考克斯-2)和前列腺素(PGs)在调节淀粉样前体蛋白(APP)切割和β-淀粉样蛋白(Aβ)产生中的作用已成为众多研究的主题,但它们对tau蛋白磷酸化的影响在很大程度上被忽视。以人TauP 301 S转基因(Tg)小鼠为体内模型,研究表明PGI 2和PGF 2 α通过PI 3-K/AKT、ERK 1/2和JNK/c-Jun信号通路介导肿瘤坏死因子α(TNF-α)和锌离子(Zn 2+)上调tau蛋白磷酸化。具体地说,我们初步发现高浓度的Zn 2+通过锌转运蛋白3(ZnT 3)依赖的机制,通过刺激TNF-α的活性,上调考克斯-2的表达。考克斯-2上调然后通过PGI 2和F2α处理刺激tau在Ser 202和Ser 400/Thr 403/Ser 404的磷酸化,无论是在i. c. v.注射小鼠或在N2 A细胞中。利用n2 a细胞作为体外模型,我们进一步揭示了PI 3-K/AKT、ERK 1/2和JNK/c-Jun通路在介导PGI 2和F2α对tau蛋白磷酸化的作用中的关键作用。最后,根据筑巢或抱肢测试,NS 398处理延迟了TauP 301 S Tg小鼠中认知下降的发作。
Although the roles of cyclooxygenase-2 (COX-2) and prostaglandins (PGs) in regulating amyloid precursor protein (APP) cleavage and β-amyloid protein (Aβ) production have been the subjects of numerous investigations, their effects on tau phosphorylation have been largely overlooked. Using human TauP301S transgenic (Tg) mice as in vivo model, our results demonstrated that PGI2 and PGF2α mediated the effects of tumor necrosis factor α (TNF-α) and Zinc ions (Zn2+) on upregulating the phosphorylation of tau via the PI3-K/AKT, ERK1/2 and JNK/c-Jun signaling pathways. Specifically, we initially found that high level of Zn2+ upregulates the expression of COX-2 via stimulating the activity of TNF-α in a zinc transporter 3 (ZnT3)-dependent mechanism. COX-2 upregulation then stimulates the phosphorylation of tau at both Ser 202 and Ser 400/Thr 403/Ser 404 via PGI2 and F2α treatment either in i.c.v.-injected mice or in n2a cells. Using n2a cells as in vitro model, we further revealed critical roles for the PI3-K/AKT, ERK1/2 and JNK/c-Jun pathways in mediating the effects of PGI2 and F2α in the phosphorylation of tau. Finally, NS398 treatment delayed the onset of cognitive decline in TauP301S Tg mice according to the nest construction or limb clasping test.
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