Phosphorylation in the amino terminus of tau prevents inhibition of anterograde axonal transport.

Phosphorylation in the amino terminus of tau prevents inhibition of anterograde axonal transport.
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DOI:
10.1016/j.neurobiolaging.2011.06.006
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发表时间:
2012-04
影响因子:
4.2
通讯作者:
Brady ST
Brady ST
中科院分区:
医学2区
文献类型:
--
作者:
Kanaan NM;Morfini G;Pigino G;LaPointe NE;Andreadis A;Song Y;Leitman E;Binder LI;Brady ST

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阿尔茨海默病(AD)和其他tau蛋白病的特征在于由微管相关蛋白tau组成的纤维状内含物。最近,我们证明了在丝状聚集体或N-末端tau亚型中的tau(aa 2-18)的N-末端激活涉及蛋白磷酸酶1和糖原合成酶激酶3的信号级联,其导致顺行快速轴突运输(FAT)的抑制。我们将tau蛋白中由aa 2-18组成的功能基序称为磷酸酶激活结构域或PAD。在这里,我们表明,在酪氨酸18,这是一个fyn磷酸化位点内PAD的tau磷酸化,阻止抑制顺行脂肪诱导的丝状tau和6D tau。此外,Fyn介导的酪氨酸18磷酸化在疾病相关形式的tau(例如tau丝)中减少。一种新的PAD特异性单克隆抗体显示,在AD缠结形成的演变中,tau中PAD的暴露发生在酪氨酸18磷酸化之前,并且比酪氨酸18磷酸化更频繁。这些结果表明,N-末端磷酸化可能构成了一种调节机制,控制tau介导的抑制AD中的顺行脂肪。
Alzheimer’s disease (AD) and other tauopathies are characterized by fibrillar inclusions composed of the microtubule-associated protein, tau. Recently, we demonstrated that the N-terminus of tau (aa 2–18) in filamentous aggregates or N-terminal tau isoforms activates a signaling cascade involving protein phosphatase 1 and glycogen synthase kinase 3 that results in inhibition of anterograde fast axonal transport (FAT). We have termed the functional motif comprised of aa 2–18 in tau the phosphatase-activating domain or PAD. Here, we show that phosphorylation of tau at tyrosine 18, which is a fyn phosphorylation site within PAD, prevents inhibition of anterograde FAT induced by both filamentous tau and 6D tau. Moreover, Fyn-mediated phosphorylation of tyrosine 18 is reduced in disease-associated forms of tau (e.g. tau filaments). A novel PAD-specific monoclonal antibody revealed that exposure of PAD in tau occurs before and more frequently than tyrosine 18 phosphorylation in the evolution of tangle formation in AD. These results indicate that N-terminal phosphorylation may constitute a regulatory mechanism that controls tau-mediated inhibition of anterograde FAT in AD.
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发表时间: 1997-12-01
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影响因子: 1.7
作者:
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DOI: 10.1023/b:neur.0000044190.96426.b9
发表时间: 2004-05-01
期刊: JOURNAL OF NEUROCYTOLOGY
影响因子: --
作者:
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