PNAS | 睡眠里的“合奏”：去甲腎上腺素、5-羥色胺與乙酰膽堿在NREM期竟然同步起伏

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Title:Synchrony of neuromodulatory systems during NREM sleep

發表時間：2025.12.24

Journal:PNAS（Proceedings of the National Academy of Sciences of the United States of America）

影響因子：9.1

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AI一句話銳評

把NREM睡眠從“低活動”改寫為“多神經調質按節律同步協作的調控窗口”，這篇文章讓“睡眠里的協調指揮”第一次在體內被清晰看見。

引言

我們對“睡著了的大腦”常有一種直覺：像把燈調暗，整體活動變弱就行。但現實更像精細的“狀態切換系統”。經典觀點認為，單胺類（monoamines）如去甲腎上腺素（norepinephrine, NE）與5-羥色胺（serotonin, 5-HT）在清醒最高、NREM睡眠降低、REM睡眠幾乎沉默；而乙酰膽堿（acetylcholine, ACh）在清醒與REM較活躍、在NREM相對低。

可如果你有過夜里“明明沒醒透卻突然警覺一下”的體驗，就會意識到：睡眠并非一條平滑曲線，而是夾雜著微覺醒（microarousal, MA）與短暫波動。近年來，借助遺傳編碼的神經遞質熒光傳感器（GRAB sensors），研究者發現NE、5-HT、ACh在NREM期并不是“低且穩”，而是以超慢頻率（infraslow oscillation, ISO，約0.02–0.03 Hz）呈現節律性起伏，并與腦電（EEG）中紡錘波相關的σ頻段功率（sigma power）起落耦合。

一個關鍵但一直缺乏體內直接證據的問題隨之出現：這些神經調質系統在NREM期各自“自顧自振蕩”，還是彼此協調、甚至相互依賴？如果它們真的同步，那就可能是大腦在睡眠中實現“既穩態維持、又隨時可被喚醒”的一種機制，也可能解釋睡眠對記憶等過程的精細調控為何需要跨腦區、跨系統的配合。本文正是圍繞“多種神經調質在NREM期是否同步、同步是否推動覺醒、同步如何被系統間相互作用所塑造”展開。

實驗設計與方法邏輯

作者在小鼠中同時植入EEG/EMG電極并進行雙位點光纖光度法（2-site fiber photometry），在內側前額葉（medial prefrontal cortex, mPFC）與海馬（hippocampus）表達NE、5-HT、ACh的GRAB熒光傳感器，記錄自然睡眠-覺醒循環；用譜相干（spectral coherence）與互相關（cross-correlation）刻畫ISO同步與時序，并以σ功率谷值對齊分析不同結局（持續NREM、MA、清醒、轉REM）前的釋放幅度與同步強度；再用藥理學“靜默”5-HT或NE系統檢驗依賴性，并用低頻光遺傳激活（optogenetics）在不引發狀態轉換的條件下測試系統間因果耦合。

核心發現

1）NREM期NE與5-HT高度同步（Figure 1）

在NREM睡眠中，去甲腎上腺素（NE）與5-羥色胺（5-HT）呈同頻（ISO）起伏，且時間差接近0，顯示兩套系統并行協同，而非各自獨立波動。

2）ACh也同步，但更早啟動（Figure 2–3）

乙酰膽堿（ACh）與NE/5-HT同樣在ISO頻段同步，但ACh穩定領先約2–4秒，提示NREM期調質波動存在固定的先后序列。

3）同步越強越容易走向微覺醒/清醒（Figure 4）

當一次NREM-ISO循環最終進入微覺醒（MA）或清醒時，NE、5-HT、ACh的釋放幅度與跨系統同步強度都更高，可預測NREM向覺醒方向的狀態轉換。

4）三系統相互依賴且可互相驅動（Figure 5–6）

藥理靜默NE或5-HT會連帶削弱另外兩者及ACh的NREM-ISO；在不引發醒來的低頻光遺傳刺激下，激活NE或5-HT神經元可誘發其他系統釋放，支持跨系統耦合具有因果性。

Fig. 1. Synchronized release of NE and 5-HT during NREM sleep.

Fig. 2. Synchronized release of ACh and 5-HT during NREM sleep.

Fig. 3. Synchronized release of NE and ACh during NREM sleep.

Fig. 4. Synchronized release of multiple neuromodulators promotes arousal.

Fig. 5. ISO during NREM sleep requires coordination among neuromodulatory systems.

Fig. 6. Optogenetic activation of neuromodulatory systems.

Abstract

Neuromodulatory systems play an essential role in regulating brain states and functions. The canonical view is that the release of monoamines including norepinephrine (NE) and serotonin (5-HT) is high during wakefulness and attenuated during sleep, particularly during rapid eye movement (REM) sleep, whereas the cholinergic system is active during both wakefulness and REM sleep and quiescent during non–REM (NREM) sleep. Recent studies have revealed a slow and rhythmic release pattern of neuromodulators during NREM sleep that drives infraslow oscillation (ISO) (0.02 to 0.03 Hz) in the brain. A key question is whether/how the release of different neuromodulators during sleep is coordinated. In this study, we combined 2-site fiber photometry with electroencephalogram/electromyography recording to monitor the release of NE, 5-HT, and acetylcholine in the cortex and hippocampus during sleep and wake cycles. We found that the ISO of these neuromodulators is synchronized during NREM sleep. The synchrony between neuromodulatory systems increases in the oscillatory cycles leading to arousal. Furthermore, pharmacological inhibition of either the 5-HT or NE system eliminates the oscillation of other neuromodulators during NREM sleep. Optogenetic activation of 5-HT or NE neurons during NREM sleep induces the release of other neuromodulators in the absence of sleep-to-wake transitions. These results suggest that the rhythmic neuromodulator releases are highly coordinated in the brain. The synchrony among multiple neuromodulatory systems across brain regions provides a powerful neural mechanism to orchestrate sleep architecture and sleep-related neural processes.

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分享人：BQ

審核：PsyBrain 腦心前沿編輯部