eLife:颠覆旧识!痴呆蛋白“变坏”比我们猜测的要“早”

2018-07-15 悠然 生物探索

7月10日,《eLife》期刊以“Inert and seed-competent tau monomers suggest structural origins of aggregation”为题发表了这一项突破性成果。来自于德克萨斯大学西南医学中心的O'Donnell大脑研究所的科学家们解析了Tau蛋白在形成更大聚合体之前的“变形记”。这一发现为AD提供了一种新的策略——在Tau蛋白变坏之前将


由Tau蛋白异常聚集形成的纤维缠结,最终会破坏神经元之间的突触连接。(图片来源:UT Southwestern)

7月10日,《eLife》期刊以“Inert and seed-competent tau monomers suggest structural origins of aggregation”为题发表了这一项突破性成果。来自于德克萨斯大学西南医学中心的O'Donnell大脑研究所的科学家们解析了Tau蛋白在形成更大聚合体之前的“变形记”。这一发现为AD提供了一种新的策略——在Tau蛋白变坏之前将其稳定下来,从而及早诊疗AD。

Tau蛋白是由一系列氨基酸构成,可以折叠成特定的形状。正常折叠的Tau蛋白不会形成有害的聚合体。之前,Tau蛋白单体被认为是天生无结构的,且只有在与其他Tau蛋白聚集形成纤维缠结之后才会“变坏”。现在,这一最新研究却打破了这一猜想。


图片来源:eLife

最新发现

阿尔茨海默病与神经退行性疾病中心的负责人Marc Diamond教授和团队从人类大脑中提取Tau蛋白,并将其分离成单个分子之后意外发现了不一样的结果——Tau蛋白有“好和坏”两种形式,而且“有害”形式的Tau蛋白会暴露正常情况下折叠在内的一部分。这一部分结构会导致其与其他Tau蛋白相结合,从而形成杀死神经元的缠结。

“虽然这一最新成果的临床效益依然需要时间验证,但是这可能是我们迄今为止最大的发现,很大程度上改变了我们对问题的看法。”Marc Diamond教授表示道,“观察到第一个分子的变化,由此找到神经退化的机制,这是解析疾病发生最初的方式。”

研究意义

几十年来,虽然在临床试验耗费了数十亿美元,阿尔兹海默症依然是全球最具破坏性、最令人困惑的疾病之一。Marc Diamond相信,解析疾病的成因,有望提供重要靶标,从而在记忆力丧失、认知力下降等症状出现之前找到诊疗的对策。

下一步,他将带领团队开发一个简单的临床检测,通过患者的血液或者脊髓液发现异常Tau蛋白的第一个生物学信号。同时,他们希望研发出治疗方法——用药物稳定“好”形式的Tau蛋白,或者去除“变化”的Tau蛋白。

Marc Diamond引用了一个值得乐观且令人信服的理由:近期获批的一款药物tafamidis能够稳定一种形状改变的蛋白——转甲状腺素蛋白(transthyretin,TTR),会在心脏中造成致命的蛋白累积,类似于Tau蛋白让大脑崩溃一样。

Marc Diamond团队之前已经证实Tau类似于朊病毒,可以像病毒一样在大脑中传播。他们发现,Tau蛋白能够形成不同的自我复制结构。现在,最新研究表明,Tau蛋白可能会形成多种可能的形状,且每一种形状关联着不同的痴呆症。

原始出处:

Hilda Mirbaha, Dailu Chen, Olga A Morazova, et.al. Inert and seed-competent tau monomers suggest structural origins of aggregation. eLife 2018;7:e36584

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    2018-10-20 clmlylxy
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    2019-02-13 膀胱癌
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    2018-07-16 1209e435m98(暂无昵称)

    学习了.谢谢分享

    0

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    2018-07-15 医者仁心5538

    学习了

    0

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    2018-07-15 神功盖世

    0

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    2018-07-15 junJUN

    老年人痴呆何药可用??

    0

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    2018-07-15 1ddf0692m34(暂无匿称)

    学习了.长知识

    0

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    2018-07-15 kafei

    学习了谢谢

    0

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Neurology:新线索提醒!晚年高血压患者要谨防老年痴呆的“光临”

近日,来自芝加哥拉什大学的研究挑战了一种理论,即老年时患高压并不像年轻时那样有害。这项最新研究显示,晚年高血压可能会损伤大脑,且与阿尔兹海默症有关。

Neurology:非糖尿病女性低空腹血清胰岛素与痴呆

之前的一项研究报道在老年男性的5年随访中,空腹胰岛素与痴呆之间存在U形关联。该研究结果证实了女性人群的非线性关联,低胰岛素值的高风险不是由于临床前痴呆或胰岛素分泌受损。这种情况表明痴呆发生可能存在新的途径,其与参与糖尿病的代谢途径有所不同。

Semin Arthritis Rheu:干燥综合征患者的痴呆风险

这项人群回顾性队列研究显示,SS患者罹患痴呆的风险升高。

JAMA Neurol:视网膜神经纤维层厚度与认知衰退

研究认为,对于无神经退行性疾病人群,较薄的视网膜神经纤维层厚度与认知能力较差以及后继认知能力衰退相关

Am J Neuroradiol:急性皮质和近皮质微梗死的MRI信号演变

大量证据显示微梗死是一种老年人常见的神经病理改变。在Alzheimer病(AD)和血管性痴呆患者中更常见。ACT研究(Adult Changes in Thought)是一个纵向基于人群关于脑龄和痴呆的研究,其尸检数据显示与痴呆最为相关的病理改变为微梗死数量的增加。