阿尔茨海默的突破：恢复了两个小时的睡眠，没有清理脑板
- 日期：
- 2026年10月19日 - 2026年10月19日 (英语).
- 资料来源：
- 肯塔基大学
- 总结：
科学家发现了阿尔茨海默病中失眠的意外原因：脑部免疫细胞过度活跃。 通过暂时清除这些细胞，研究人员恢复了小鼠每天两个多小时的睡眠，揭示出一个有希望的新治疗目标。
- 共享：
科学家发现了阿尔茨海默氏病扰乱睡眠的意想不到的原因，他们的研究结果表明这个问题可能是可逆转的。 在涉及小鼠阿尔茨海默症类似脑部变化的实验中，研究人员恢复了每天两个多小时的睡眠，而没有去除与该疾病相关的酰胺板。
令人惊讶的发现指出一个被忽视的罪魁祸首：大脑自身的免疫细胞。 这些细胞不是简单地保护大脑免受损伤，而是会引发炎症，干扰健康的睡眠。
肯塔基大学的研究人员发现，这些免疫细胞的大部分暂时被消灭，使得小鼠能够更长时间的睡眠，在深沉的恢复性睡眠阶段花费更多的时间。 结果显示，有可能采取新的办法，治疗阿尔茨海默症最具有破坏性的症状之一。
研究结果发表在"阿尔茨海默症与痴呆症"杂志上，由肯塔基大学医学院生理学副教授香农·L·澳门利(英语：Shannon L. Macauley)领导的团队和近代博士研究生尼古拉斯·J·君士坦丁诺(英语：Nicholas J. Constantino)的第一作者报告。
澳门利将这一发现描述为"paradigm-turning"，因为它挑战了人们对为何阿尔茨海默症患者经常面临严重睡眠问题的普遍理解。
大脑免疫系统如何干扰睡眠
为了了解研究者发现了什么想象一下厨房里爆发了一场小火大楼的喷洒系统没有抑制火焰，而是在各地激活，淹没了整个房屋，并造成广泛的破坏。
在阿尔茨海默氏病发作期间，脑部可能发生类似的情况。
Amyloid牌是粘性蛋白质碎片的矿床，在神经细胞之间积累。 它们是阿尔茨海默氏症的特征之一，长期以来就因其在疾病中的作用而受到调查。
大脑中还包含被称为微胶片的专用免疫细胞。 这些细胞通常通过清除碎片，对伤害作出反应，帮助维持神经元的健康环境来保护神经系统。
然而，当微胶片检测到酰基平板时，它们的防御反应可能会变得过度。 它们不是简单地应对威胁，而是释放出可能干扰正常大脑活动的煽动性信号。
科学家传统上将阿尔茨海默症的睡眠问题主要与受损的神经元或氨基杂质板的积累联系起来。 新的发现表明免疫系统对这些牌匾的反应起着主要作用。
“基本上，我们表明，造成睡眠损失的不是牌匾本身，也不是完全功能失调的神经元，而是实际上的微胶片。” "米克罗格莉亚是免疫细胞，当它们响应牌子时，会踢出这种精心设计的炎症级联，仿佛微格丽亚整晚都在狂欢，让大脑保持清醒".
换句话说，大脑对阿尔茨海默氏病变的反应，可能会在牌位本身引起的问题之外产生更多的问题。 研究者将这种广泛的反应比作"全屋反应"，其中的防御机制最终造成比预期更多的破坏。
追踪脑内阿尔茨海默症的睡眠变化
为了调查微胶片和睡眠之间的联系，科学家们研究了两组小鼠。 一组在基因上被先发制人以发展酰胺板块，而另一组则由经历典型衰老的普通"摇摆型"小鼠组成。
研究人员在两岁时对动物进行了检查：6个月，在转基因小鼠中首次出现斑块，18个月，当疾病模型显示出更先进的病理学。
比较这些组别有助于科学家区分与阿尔茨海默病理学相关的变化和大脑老化后自然发生的变化。
团队使用几种先进技术测量睡眠，并检查大脑内部发生的情况。
每只鼠标都装有一个记录电脑学(EEG)和电磁学(EMG)的小装置。
EEG测量大脑的电活性，包括神经元网络通信时产生的规律和节奏。 这些电路信号的变化取决于大脑是清醒的，做梦还是经历深眠。
EMG测量肌肉中的电活性。 将这两种技术结合起来，使研究人员能够确定不同的睡眠阶段，并确定每个阶段中动物的停留时间。
科学家们还希望可以直观地看到整个大脑中氨基杂酚板与免疫细胞之间的关系。
为此，他们使用了光板显微镜，一种使生物组织透明化的成像技术，并以一层薄的激光光照照亮它。 由此产生的图像可以编组成详细的三维地图，使科学家能够检查本来难以看到的结构。
这种方法揭示了板块和微胶片在整个大脑的分布，帮助研究人员了解免疫细胞在哪些地方应对阿尔茨海默病变。
暂时清除87%的脑膜细胞
为了确定微胶片是否实际对睡眠中断负责，团队进行了一项实验，旨在暂时消灭大部分这些细胞。
研究人员服用一种名为Pexidartinib(PLX3397)的药物，最初用于癌症研究。 它屏蔽了一个细胞信号微型胶片赖以生存
小鼠在食物中服药14天后，大约87%的微胶片已经耗尽。
这使得科学家可以测试当驱动炎症反应的细胞基本不存在时，睡眠是否会改善。
研究人员还使用一种叫Fitting Oscillations and One Over Vention(FOOF)的数学方法对动物的大脑活动进行了详细的分析。
这种技术将电信号分为周期性活动(我们通常认为是脑波的节奏波)和周期性活动(背景性电噪声).
通过审查这些不同的部分，小组可以确定大脑如何运作的变化，包括大脑在本应休息期间是否仍然异常活跃。
这个过程有点像监测一个汽车发动机，以确定它是否继续高速运行，即使车辆应该是闲置的。
关于阿尔茨海默脑浆的惊奇发现
澳门利称结果为"轻而易举且出乎意料".
最令人惊奇的发现之一是，睡眠问题并没有随着氨基甲酸盐板的积累而继续恶化。
研究人员最初预计，增加牌子积聚将导致睡眠扰动逐渐加剧。 相反，小鼠的睡眠问题相对较早，即使牌位水平急剧上升，这些问题基本没有变化。
"我预计随着牌匾负担变得更加严重，睡眠中断也会恶化"，称君士坦丁诺。 "睡眠和皮质EEG活动的中断，发生在6个月，当牌坊首次出现时，并没有恶化18个月，尽管牌坊负担的两倍多".
小组将这一模式描述为上限效应。 基本上，睡眠中断似乎在疾病过程的早期达到一定程度，而不是与大脑中的酰胺量成正比增长。
这表明牌子引发的初步煽动性反应可能特别重要。 一旦微胶体被激活并干扰睡眠，额外的板块积聚不一定会导致睡眠损失的等效增加。
该发现提供了一个重要的线索，说明为什么睡眠紊乱可以在阿尔茨海默氏病中相对早期出现。
阿尔茨海默症打破了睡眠与正常老龄化的不同类型
研究还揭示了由正常衰老导致的睡眠变化和与阿尔茨海默病理学相关的睡眠变化之间的显著差异。
睡眠不是一个单一的统一状态。 整个夜晚，大脑会穿过几个阶段，履行不同的功能。
快速眼动(REM)睡眠与生动的梦想有着紧密的联系，并在处理记忆中发挥重要作用。 研究人员发现，正常的衰老主要减少了这种类型的睡眠。
然而阿尔茨海默症的病变产生了不同的效果。 它有选择地干扰了非快速眼动(NREM)睡眠，包括最深和最恢复身体的睡眠阶段。
在NREM睡眠期间，大脑履行支持学习、记忆和恢复的基本维护功能。 深睡眠也与有助于清除大脑中代谢废物产品的过程有关。
"恢复性睡眠对于身体修补，学习和记忆以及洗涤当日的毒素具有超重要的意义"(Macauley 称).
失去这个重要的睡眠阶段可能会有超过白天疲劳的后果。
由于健康睡眠有助于维持大脑的内部环境，中断可能干扰通常清除潜在有害废物的过程。 研究者怀疑这可能助长自愈循环，阿尔茨海默症的病理会干扰睡眠，睡眠不足可能进一步加剧疾病。
因此，打破这一循环可以成为一个重要的治疗战略。
超过两个小时的睡眠在不移除花板的情况下恢复
最显著的结果是研究者们用阿尔茨海默病理学暂时从小鼠大脑中移除了大部分微胶片。
动物们每天得到两个多小时的睡眠。
他们还经历了较长的恢复性NREM睡眠期，让他们有更多的机会自然过渡到REM睡眠，这对记忆形成很重要。
更令人惊讶的是，这些改进并未减少氨基甲状腺素水平。
牌子还在但老鼠睡得好多了
这一调查结果提供了证据，证明由微胶片驱动的炎症反应直接导致睡眠中断，压制这种反应至少可以扭转一些相关的睡眠问题。
它还表明，研究人员可能不需要去除氨基甲酸盐板以改善阿尔茨海默氏病中的睡眠。
虽然这些发现很有希望，但实验是在小鼠身上进行的，人们还没有表现出同样的效益。 暂时去除大部分大脑的免疫细胞，也并不是对阿尔茨海默症患者的一种既定或实际的治疗。
研究者现在关心的是，能否通过调整微滑翔活性来复制有益的效果，而不是消灭细胞本身。
如果这种方法最终在人类中证明是成功的，它可以提供一种改善睡眠的方法，并有可能减轻大脑上一些糟糕睡眠场所的额外压力。
发现背后的研究团队
这项工作是在肯塔基大学桑德斯-布朗老龄问题中心生理学系的澳门利实验室进行的。
澳门利将这一成就归功于与愿意挑战关于阿尔茨海默症的既定思想的学生和研究人员的"美丽伙伴关系".
"我爱那些主动，发现自己的热情，好奇，不断推下去的人"
本文由 AI图鉴自动抓取并翻译，版权归原作者所有；如需查看原文请点下方链接。
"Mind-blowing" Alzheimer’s breakthrough: Two hours of sleep restored without clearing brain plaques
- Date:
- October 19, 2026
- Source:
- University of Kentucky
- Summary:
- Scientists have uncovered an unexpected culprit behind sleep loss in Alzheimer’s disease: overactive immune cells in the brain. By temporarily removing these cells, researchers restored more than two hours of sleep per day in mice, revealing a promising new target for treatment.
- Share:
Scientists have discovered an unexpected reason why Alzheimer's disease disrupts sleep, and their findings suggest that the problem may be reversible. In experiments involving mice with Alzheimer's-like brain changes, researchers restored more than two hours of sleep per day without removing the amyloid plaques associated with the disease.
The surprising discovery points to an overlooked culprit: the brain's own immune cells. Rather than simply protecting the brain from damage, these cells can trigger inflammation that interferes with healthy sleep.
Researchers at the University of Kentucky found that temporarily eliminating most of these immune cells allowed the mice to sleep longer and spend more time in the deep, restorative stages of sleep. The results suggest a potential new approach to treating one of the most disruptive symptoms of Alzheimer's disease.
The findings, published in the journal Alzheimer's & Dementia, were reported by a team led by Shannon L. Macauley, Ph.D., an associate professor of physiology at the University of Kentucky College of Medicine, and first author Nicholas J. Constantino, Ph.D., a recent doctoral graduate.
Macauley described the discovery as "paradigm-shifting" because it challenges the prevailing understanding of why people with Alzheimer's often experience severe sleep problems.
How the Brain's Immune System Can Disrupt Sleep
To understand what the researchers uncovered, imagine a small fire breaking out in a kitchen. Instead of containing the flames, the building's sprinkler system activates everywhere, flooding the entire house and causing widespread damage.
Something similar may happen in the brain during Alzheimer's disease.
Amyloid plaques are deposits of sticky protein fragments that accumulate between nerve cells. They are one of the characteristic features of Alzheimer's and have long been investigated for their role in the disease.
The brain also contains specialized immune cells known as microglia. These cells normally protect the nervous system by removing debris, responding to injuries, and helping maintain a healthy environment for neurons.
However, when microglia detect amyloid plaques, their defensive response can become excessive. Instead of simply addressing the threat, they release inflammatory signals that may interfere with normal brain activity.
Scientists have traditionally linked sleep problems in Alzheimer's primarily to damaged neurons or the accumulation of amyloid plaques. The new findings suggest that the immune system's reaction to those plaques plays a major role.
"Basically, we showed that it is not the plaques themselves, or solely dysfunctional neurons, that cause sleep loss but actually microglia," said Macauley. "Microglia are immune cells that, when they respond to plaques, kick off this elaborate cascade of inflammation, as if the microglia are partying all night, and keeping the brain awake."
In other words, the brain's response to Alzheimer's pathology may create additional problems beyond those caused by the plaques themselves. The researchers compared this widespread reaction to a "whole house response," in which a defense mechanism ends up causing more disruption than expected.
Tracking Alzheimer's Sleep Changes Inside the Brain
To investigate the connection between microglia and sleep, the scientists studied two groups of mice. One group was genetically predisposed to develop amyloid plaques, while the other consisted of normal "wild-type" mice that experienced typical aging.
The researchers examined the animals at two ages: six months, when plaques first appeared in the genetically modified mice, and 18 months, when the disease model showed more advanced pathology.
Comparing these groups helped the scientists distinguish changes associated with Alzheimer's pathology from those that naturally occur as the brain ages.
The team used several advanced technologies to measure sleep and examine what was happening inside the brain.
Each mouse was fitted with a small device that recorded electroencephalography (EEG) and electromyography (EMG).
EEG measures the brain's electrical activity, including the patterns and rhythms produced when networks of neurons communicate. These electrical signals change depending on whether the brain is awake, dreaming or experiencing deep sleep.
EMG measures electrical activity in muscles. Combining the two techniques allowed researchers to identify different sleep stages and determine how long the animals remained in each one.
The scientists also wanted to visualize the relationship between amyloid plaques and immune cells throughout the brain.
For this, they used light-sheet microscopy, an imaging technique that makes biological tissue transparent and illuminates it with a thin layer of laser light. The resulting images can be assembled into detailed three-dimensional maps, allowing scientists to examine structures that would otherwise be difficult to see.
This approach revealed the distribution of plaques and microglia across the brain, helping researchers understand where immune cells were responding to Alzheimer's pathology.
Scientists Temporarily Remove 87% of Brain Immune Cells
To determine whether microglia were actually responsible for disrupted sleep, the team conducted an experiment designed to temporarily eliminate most of these cells.
The researchers administered a drug called Pexidartinib (PLX3397), which was originally developed for cancer research. It blocks a cellular signal that microglia depend on for survival.
After the mice received the medication in their food for 14 days, approximately 87% of their microglia had been depleted.
This allowed the scientists to test whether sleep would improve when the cells driving the inflammatory response were largely absent.
The researchers also performed a detailed analysis of the animals' brain activity using a mathematical method called Fitting Oscillations and One Over Frequency (FOOOF).
This technique separates electrical signals into periodic activity (the rhythmic waves we usually think of as brain waves) and aperiodic activity (the background electrical noise).
By examining these different components, the team could identify changes in how the brain was functioning, including whether it remained unusually active during periods when it should have been resting.
The process is somewhat like monitoring a car engine to determine whether it continues running at high speed even when the vehicle is supposed to be idle.
A Surprising Discovery About Alzheimer's Brain Plaques
Macauley called the results "mind-blowing and unexpected."
One of the most surprising findings was that sleep problems did not continue worsening as amyloid plaques accumulated.
The researchers initially expected that increasing plaque buildup would lead to progressively more severe sleep disturbances. Instead, the mice developed substantial sleep problems relatively early, and those problems remained largely unchanged even as plaque levels increased dramatically.
"I expected that as plaque burden became more severe, sleep disruption would also worsen," said Constantino. "The disruptions in sleep and cortical EEG activity that occur at 6 months, when plaques first emerge, did not worsen by 18 months, despite more than double the amount of plaque burden."
The team described this pattern as a ceiling effect. Essentially, sleep disruption appeared to reach a certain level early in the disease process rather than increasing in direct proportion to the amount of amyloid in the brain.
This suggests that the initial inflammatory response triggered by plaques may be particularly important. Once microglia become activated and disrupt sleep, additional plaque accumulation may not necessarily produce an equivalent increase in sleep loss.
The discovery offers an important clue as to why sleep disturbances can emerge relatively early in Alzheimer's disease.
Alzheimer's Disrupts a Different Type of Sleep Than Normal Aging
The study also revealed a notable difference between sleep changes caused by normal aging and those associated with Alzheimer's pathology.
Sleep is not a single, uniform state. Throughout the night, the brain moves through several stages that perform different functions.
Rapid eye movement (REM) sleep is strongly associated with vivid dreaming and plays an important role in processing memories. The researchers found that normal aging primarily reduced this type of sleep.
Alzheimer's pathology, however, had a different effect. It selectively disrupted non-rapid eye movement (NREM) sleep, which includes the deepest and most physically restorative stages of sleep.
During NREM sleep, the brain performs essential maintenance functions that support learning, memory, and recovery. Deep sleep is also associated with processes that help clear metabolic waste products from the brain.
"That restorative sleep is super important for physical repair, learning and memory and washing out the toxins of the day," Macauley said.
Losing this important stage of sleep could have consequences beyond daytime fatigue.
Because healthy sleep helps maintain the brain's internal environment, disruptions may interfere with processes that normally remove potentially harmful waste. Researchers suspect this could contribute to a self-reinforcing cycle in which Alzheimer's pathology disturbs sleep, and inadequate sleep may further aggravate the disease.
Breaking that cycle could therefore become an important treatment strategy.
More Than Two Hours of Sleep Restored Without Removing Plaques
The most striking result emerged after the researchers temporarily removed most of the microglia from the brains of mice with Alzheimer's-like pathology.
The animals gained more than two hours of sleep per day.
They also experienced longer periods of restorative NREM sleep, giving them more opportunities to transition naturally into REM sleep, which is important for memory formation.
Even more surprisingly, these improvements occurred without any reduction in amyloid plaque levels.
The plaques were still present, but the mice were sleeping substantially better.
This finding provides evidence that the inflammatory response driven by microglia contributes directly to sleep disruption and that suppressing this response can reverse at least some of the associated sleep problems.
It also suggests that researchers may not need to eliminate amyloid plaques to improve sleep in Alzheimer's disease.
Although these findings are promising, the experiments were conducted in mice, and the same benefits have not yet been demonstrated in people. Temporarily removing most of the brain's immune cells is also not an established or practical treatment for Alzheimer's patients.
The researchers are now interested in whether the beneficial effects can be reproduced by adjusting microglial activity rather than eliminating the cells themselves.
If such an approach eventually proves successful in humans, it could provide a way to improve sleep and potentially reduce some of the additional stress that poor sleep places on the brain.
The Research Team Behind the Discovery
The work was conducted in Macauley's laboratory in the Department of Physiology at the University of Kentucky's Sanders-Brown Center on Aging.
Macauley credits the achievement to a "beautiful partnership" with students and researchers who were willing to challenge established ideas about Alzheimer's disease.
"I love people who take initiative, find their passion, are curious, and keep pushin
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