Nature Neurosci:睡眠差居然与老年痴呆相关

2015-06-05 佚名 生物谷

来自加州大学伯克利分校的研究人员们发现老年痴呆症的beta-淀粉样蛋白沉淀,与睡眠差(尤其是非快速动眼期睡眠的中断)及大脑的长时期记忆力减退有关。这项研究揭示了老年痴呆症引起记忆力下降的一种可能的方式,即影响睡眠。相关研究结果于近日在线发表在Nature Neuroscience杂志上。 在此项研究中,研究人员们利用了正电子发射断层扫描(PET)来测量大脑中beta-淀粉样蛋白的沉积量;用功

来自加州大学伯克利分校的研究人员们发现老年痴呆症的beta-淀粉样蛋白沉淀,与睡眠差(尤其是非快速动眼期睡眠的中断)及大脑的长时期记忆力减退有关。这项研究揭示了老年痴呆症引起记忆力下降的一种可能的方式,即影响睡眠。相关研究结果于近日在线发表在Nature Neuroscience杂志上。

在此项研究中,研究人员们利用了正电子发射断层扫描(PET)来测量大脑中beta-淀粉样蛋白的沉积量;用功能性磁共振成像(fMRI)来检测大脑在记忆活动中的活性;用脑电图(EEG)来记录大脑在睡眠时的脑电波;最后,他们利用统计模型来分析所有的数据。

研究人员招募了26名年龄在65到81之间的老年人,他们没有痴呆症,神经退行性病变,睡眠或是精神障碍。首先,这些老年人接受了正电子发射断层扫描(PET),来测量他们大脑中beta-淀粉样蛋白的量。接着,他们被要求记住120个词组,并且检验他们最终记住了多少个。在接下来的8小时睡眠中,脑电图记录了他们的脑电波。第二天早上,这些老年人被要求回想昨天记住的词组,同时他们的大脑接受了功能性磁共振成像的检测,此时,可以检测到大脑海马区域的活性,短暂的记忆被储存在这里,之后这些记忆被传送到前额叶皮层。结果显示,参与者中内侧额叶皮层的beta-淀粉样蛋白最高者,睡眠质量最差,而且,在第二天的词组记忆测试中,参与者忘记了一半以上的前一天所记住的词组。

此项研究提示,大脑中越多的beta-淀粉样蛋白,会导致睡眠质量越差,结果,记忆力也越差。而且,越差的睡眠,也会反过来导致大脑清除这些有害的蛋白的能力越差,这是一种恶性循环。然而,低质量的睡眠和有害的蛋白,哪一个因素是此恶性循坏的起始点,现在仍不清楚。


原始出处:

Bryce A Mander, Shawn M Marks, Jacob W Vogel, Vikram Rao, Brandon Lu, Jared M Saletin, Sonia Ancoli-Israel, William J Jagust & Matthew P Walker.β-amyloid disrupts human NREM slow waves and related hippocampus-dependent memory consolidation.Nature Neuroscience, June 1, 2015.doi:10.1038/nn.4035

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    2016-01-26 doctording1

    这篇文章有一定深度

    0

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    2016-01-26 doctording1

    是一篇不错的文章

    0

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    2016-04-03 liye789132251
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    2015-06-10 qinweihan19

    看来我有有AD的危险

    0

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    2015-06-10 Messichen1992

    以后睡好点啊

    0

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    2015-06-08 18619c0a62m

    ?

    0

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    2015-06-07 lsndxfj

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