Calcium phosphatase calcineurin influences tau metabolism.

Calcium phosphatase calcineurin influences tau metabolism.
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磷酸钙钙调神经蛋白会影响tau代谢。

DOI:
10.1016/j.neurobiolaging.2012.05.003
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发表时间:
2013-02
影响因子:
4.2
通讯作者:
Goate AM
Goate AM
中科院分区:
医学2区
文献类型:
--
作者:
Karch CM;Jeng AT;Goate AM

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阿尔茨海默病(AD)的特征在于脑中神经元损失和β-淀粉样蛋白斑块和神经元缠结的积累。β-淀粉样蛋白和tau/ptau 181的脑脊液(CSF)水平也与AD相关。我们先前已经证明钙调磷酸酶的单核苷酸多态性与CSF ptau 181水平和AD进展相关。在这项研究中,我们证明,钙调神经磷酸酶蛋白水平与痴呆的严重程度和Braak缠结阶段在AD大脑呈负相关,钙调神经磷酸酶活性在AD大脑中整体降低。然后,我们试图通过测量培养细胞中的细胞外tau来模拟观察到的CSF tau的变化。用钙调磷酸酶抑制剂处理的SH-SY 5 Y细胞产生降低的钙调磷酸酶活性和相应的细胞外ptau 181的增加。这些发现与我们在AD患者中的观察结果一致,AD患者具有升高的CSF ptau 181和降低的脑提取物中的钙调磷酸酶活性。因此,我们已经确定了一个基因,有助于AD的病理和功能的后果,在培养的细胞中的tau代谢。
Alzheimer’s disease (AD) is characterized by neuronal loss and the accumulation of β-amyloid plaques and neurofibrillary tangles in the brain. Cerebrospinal fluid (CSF) levels of β-amyloid and tau/ptau181 are also associated with AD. We have previously demonstrated that a single nucleotide polymorphism in calcineurin is associated with CSF ptau181 levels and AD progression. In this study, we demonstrate that calcineurin protein levels are inversely correlated with dementia severity and Braak tangle stage in AD brains, and calcineurin activity is globally reduced in AD brains. We then sought to model the observed changes in CSF tau by measuring extracellular tau in cultured cells. SH-SY5Y cells treated with calcineurin inhibitors produced reduced calcineurin activity and a corresponding increase in extracellular ptau181. These findings are consistent with our observations in AD patients, who have elevated CSF ptau181 and reduced calcineurin activity in brain extracts. Thus, we have identified a gene that contributes to AD pathology and has functional consequences on tau metabolism in cultured cells.
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