関連する実験動画

Updated: Jun 12, 2025

Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice

Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice

Published on: June 19, 2019

シナプス・ケミオゲネティクスによって明らかにされた,ホメオスタティック・スリープ・プレッシャーの前頭部シナプス調節

Takeshi Sawada^1,2, Yusuke Iino³, Kensuke Yoshida^3,4

¹International Research Center for Neurointelligence (WPI-IRCN), UTIAS, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.

Science (New York, N.Y.)

|September 26, 2024

まとめ

科学者は脳細胞間の結合の強さつまりシナプス結合の強さが睡眠の圧力に直接影響を及ぼすことを発見しました前頭前皮質のシナプス強さを高めると睡眠の量とデルタパワーが増加し睡眠調節の重要な生物学的メカニズムが明らかになります

科学分野:

神経科学
睡眠科学
細胞生物学

背景:

ホメオスタティックなプロセスで睡眠が調節されますが睡眠圧力の生物学的な根拠は不明です
睡眠中に蓄積され,睡眠中に消去される睡眠圧力は,睡眠の開始と調節に不可欠です.
既存の研究では細胞レベルの変化とデルタパワーのようなマクロレベルの睡眠圧力の指標との関連が完全に解明されていません

研究の目的:

細胞のシナプス強さと睡眠圧力のマーカーである電気脳図のデルタパワーの因果関係を調べるため
シナプスの強さを操作し睡眠への影響をテストする理論的枠組みと分子ツールを開発する
特定の脳の領域のシナプス力が哺乳類の睡眠圧力を決定するかどうか

主な方法:

神経細胞の"ダウン状態"とデルタパワーに対するシナプス強さの影響を予測する数学的モデルを開発した.
カリリン-7の化学的に誘導された転位のための新しい分子ツール (SYNCit-K) を作成し,シナプス強さを操作しました.
哺乳類における前頭前皮質 (PFC) の刺激性ニューロンにおけるシナプス増強を誘導するためにSYNCit-Kを使用した.

主要な成果:

シナプスの強さが増加するとデルタパワーが上昇すると予測されました
SYNCit-Kを用いた実験的な操作は,PFCにおけるシナプス増強が非急速眼運動睡眠量を増加させることを示した.
PFC刺激性ニューロンのシナプス増強はデルタパワーを増加させ,睡眠圧力の増加と相関することが示された.

結論:

細胞のシナプス強さは哺乳類のマクロレベルの睡眠圧力の決定要因である.
前頭前皮質のシナプス増強は,睡眠量とデルタパワーを増加させることで,睡眠の調節に直接影響します.
この研究は,睡眠圧力の生物学的な基礎を理解するための新しい分子理論的枠組みを提供します.

さらに関連する動画

Polygraphic Recording Procedure for Measuring Sleep in Mice

Polygraphic Recording Procedure for Measuring Sleep in Mice

Published on: January 25, 2016

The Sleep Nullifying Apparatus: A Highly Efficient Method of Sleep Depriving Drosophila

The Sleep Nullifying Apparatus: A Highly Efficient Method of Sleep Depriving Drosophila

Published on: December 14, 2020

関連する概念動画

Understanding Sleep

Understanding Sleep

Sleep, an essential biological state, involves significant reductions in physical activity, sensory awareness, and interaction with the environment. This complex physiological process is primarily regulated by specific brain regions, notably the hypothalamus and pons, which govern the sleep-wake cycle or circadian rhythm.
The circadian rhythm, a nearly 24-hour cycle, is deeply influenced by environmental light cues. Light exposure directly affects the hypothalamus, which in turn regulates...

Overview of Synapses

Overview of Synapses

A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the...

Neural Regulation of Blood Pressure

Neural Regulation of Blood Pressure

The neural regulation of blood pressure involves intricate interactions between the autonomic nervous system (ANS) and cardiovascular system, ensuring adequate perfusion of tissues. This regulation primarily occurs through baroreceptor and chemoreceptor reflexes, involving both short-term and long-term mechanisms.
Baroreceptor Reflex
Baroreceptors, located in the carotid sinuses and aortic arch, detect changes in blood pressure. When blood pressure rises, these stretch-sensitive receptors...

Regulation of Food Intake

Regulation of Food Intake

Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...

Sleep-Wake Cycles

Sleep-Wake Cycles

Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:

Chemical Synapses

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...