Overexpression of Tau Rescues Nogo-66-Induced Neurite Outgrowth Inhibition In Vitro

Overexpression of Tau Rescues Nogo-66-Induced Neurite Outgrowth Inhibition In Vitro
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Tau 的过度表达可在体外挽救 Nogo-66 诱导的神经突生长抑制

DOI:
10.1007/s12264-016-0068-z
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发表时间:
2016-10
期刊:
Neurosci. Bull.
影响因子:
--
通讯作者:
Nan-Xiang Xiong
Nan-Xiang Xiong
中科院分区:
其他
文献类型:
--
作者:
Hong-Yang Zhao;Yu-Chao Zuo;Nan-Xiang Xiong

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Nogo-66 在髓磷脂介导的神经突生长抑制中发挥核心作用。 Tau 是一种微管相关蛋白,参与微管组装和稳定。 tau 蛋白是否直接与生长因子受体相互作用,或与 Nogo-66 等再生抑制剂发生交互作用,尚未得到证实。在这里,我们报告 tau 的质粒过表达显着提高了总 tau、磷酸化 tau 和微管亲和力调节激酶 (MARK) 的蛋白水平。 Nogo-.66 短暂升高了总 tau 蛋白水平,并持续降低了 p-S262 tau(tau 在丝氨酸 262 处磷酸化)的水平,而对 p-T205 tau(tau 在苏氨酸 205 处磷酸化)的水平几乎没有影响。Nogo-66 显着降低了.MARK 的蛋白水平。 Hymenialdisine 是 MARK 的抑制剂,可显着降低 p-S262 tau 的水平。 tau 的过表达可挽救 Nogo-66 诱导的神经母细胞瘤 2a (N2a) 细胞和初级皮质神经元中神经突生长的抑制。然而,同时抑制 MARK 会消除 tau in.N2a 细胞对神经突生长的拯救作用。我们得出结论,tau at.S262 的去磷酸化能够调节 Nogo-66 信号传导,并且 tau 的过度表达可以在体外挽救 Nogo-66 诱导的轴突生长抑制。
Nogo-66 plays a central role in the myelinmediated.inhibition of neurite outgrowth. Tau is a microtubule-.associated protein involved in microtubule assembly.and stabilization. It remains unverified whether tau interacts.directly with growth factor receptors, or engages in.cross-talk with regeneration inhibitors like Nogo-66. Here,.we report that plasmid overexpression of tau significantly.elevated the protein levels of total tau, phosphorylated tau,.and microtubule-affinity regulating kinase (MARK). Nogo-.66 transiently elevated the total tau protein level and persistently.reduced the level of p-S262 tau (tau phosphorylated.at serine 262), whereas it had little influence on the.level of p-T205 tau (tau phosphorylated at threonine 205)..Nogo-66 significantly decreased the protein level of.MARK. Hymenialdisine, an inhibitor of MARK, significantly.reduced the level of p-S262 tau. Overexpression of.tau rescued the Nogo-66-induced inhibition of neurite.outgrowth in neuroblastoma 2a (N2a) cells and primary.cortical neurons. However, concomitant inhibition of MARK abolished the rescue of neurite outgrowth by tau in.N2a cells. We conclude that dephosphorylation of tau at.S262 is able to regulate Nogo-66 signaling, and that.overexpression of tau can rescue the Nogo-66-induced.inhibition of neurite outgrowth in vitro.
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发表时间: 2014-08
影响因子: 5.7
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