小柯机器人

40赫兹的光刺激不会引起阿尔茨海默病模型小鼠的自然伽马振荡
2023-03-12 13:25

美国纽约大学György Buzsáki团队近期取得重要工作进展,他们研究发现40赫兹(Hz)的光刺激不会引起阿尔茨海默病模型小鼠的自然伽马振荡。相关研究成果2023年3月6日在线发表于《自然—神经科学》杂志上。

据介绍,人们需要非侵入性方法来改善疾病。

研究人员探索了40 Hz闪烁光是否在阿尔茨海默病的APP/PS1和5xFAD小鼠模型的大脑中引起伽马振荡并抑制β-淀粉样蛋白。研究人员在视觉皮层、内嗅皮层或海马体中使用多位点定硅探头记录,发现40 Hz闪烁模拟在这些区域中没有发生自然伽马振荡。

此外,海马体中的尖峰响应较弱,这表明40 Hz的光不能有效地夹带深层结构。小鼠避免了与海马胆碱能活性升高相关的40 Hz闪烁光。研究人员发现,在40 Hz刺激后,通过免疫组织化学或体内双光子成像,斑块计数或小胶质细胞形态没有可靠的变化,β-淀粉样蛋白40/42的水平也没有降低。

因此,视觉闪烁刺激可能不是调节深层结构活动的可行机制。

附:英文原文

Title: Forty-hertz light stimulation does not entrain native gamma oscillations in Alzheimer’s disease model mice

Author: Soula, Marisol, Martn-vila, Alejandro, Zhang, Yiyao, Dhingra, Annika, Nitzan, Noam, Sadowski, Martin J., Gan, Wen-Biao, Buzski, Gyrgy

Issue&Volume: 2023-03-06

Abstract: There is a demand for noninvasive methods to ameliorate disease. We investigated whether 40-Hz flickering light entrains gamma oscillations and suppresses amyloid-β in the brains of APP/PS1 and 5xFAD mouse models of Alzheimer’s disease. We used multisite silicon probe recording in the visual cortex, entorhinal cortex or the hippocampus and found that 40-Hz flickering simulation did not engage native gamma oscillations in these regions. Additionally, spike responses in the hippocampus were weak, suggesting 40-Hz light does not effectively entrain deep structures. Mice avoided 40-Hz flickering light, associated with elevated cholinergic activity in the hippocampus. We found no reliable changes in plaque count or microglia morphology by either immunohistochemistry or in vivo two-photon imaging following 40-Hz stimulation, nor reduced levels of amyloid-β 40/42. Thus, visual flicker stimulation may not be a viable mechanism for modulating activity in deep structures.

DOI: 10.1038/s41593-023-01270-2

Source: https://www.nature.com/articles/s41593-023-01270-2

Nature Neuroscience:《自然—神经科学》,创刊于1998年。隶属于施普林格·自然出版集团,最新IF:28.771
官方网址:https://www.nature.com/neuro/
投稿链接:https://mts-nn.nature.com/cgi-bin/main.plex


本期文章:《自然—神经科学》:Online/在线发表

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