Tau mislocalization to dendritic spines mediates synaptic dysfunction independently of neurodegeneration.

Tau mislocalization to dendritic spines mediates synaptic dysfunction independently of neurodegeneration.
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DOI:
10.1016/j.neuron.2010.11.030
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发表时间:
2010-12-22
期刊:
影响因子:
16.2
通讯作者:
Liao, Dezhi
Liao, Dezhi
中科院分区:
医学1区
文献类型:
--
作者:
Hoover, Brian R.;Reed, Miranda N.;Su, Jianjun;Penrod, Rachel D.;Kotilinek, Linda A.;Grant, Marianne K.;Pitstick, Rose;Carlson, George A.;Lanier, Lorene M.;Yuan, Li-Lian;Ashe, Karen H.;Liao, Dezhi

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微管相关蛋白tau在阿尔茨海默氏症和其他致命的痴呆症中积累,当前脑神经元死亡时就会显现出来。了解这些疾病的最新进展表明,脑功能障碍先于神经变性,但tau的作用尚不清楚。在这里,我们表明早期tau相关的缺陷不是由于突触或神经元的丧失,而是由于过度磷酸化的tau在完整的树突棘中积聚而引起的突触异常,它通过损害谷氨酸受体运输或突触锚定来扰乱突触功能。14个疾病相关的丝氨酸和苏氨酸氨基酸残基的突变产生了假性过度磷酸化的tau,导致了tau的错误定位,而磷酸化缺陷的tau的产生阻止了tau对树突棘的错误靶向。因此,tau的磷酸化在介导tau错误定位和随后的突触损伤中起着关键作用。这些数据表明,由tau引起的早期突触功能障碍位于树突棘中。
The microtubule-associated protein tau accumulates in Alzheimer’s and other fatal dementias, which manifest when forebrain neurons die. Recent advances in understanding these disorders indicate that brain dysfunction precedes neurodegeneration, but the role of tau is unclear. Here, we show that early tau-related deficits develop not from the loss of synapses or neurons, but rather as a result of synaptic abnormalities caused by the accumulation of hyperphosphorylated tau within intact dendritic spines, where it disrupts synaptic function by impairing glutamate receptor trafficking or synaptic anchoring. Mutagenesis of 14 disease-associated serine and threonine amino acid residues to create pseudohyperphosphorylated tau caused tau mislocalization while creation of phosphorylation-deficient tau blocked the mis-targeting of tau to dendritic spines. Thus, tau phosphorylation plays a critical role in mediating tau mislocalization and subsequent synaptic impairment. These data establish that the locus of early synaptic malfunction caused by tau resides in dendritic spines.
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