大脑间歇性离子组成的变化控制着睡眠-觉醒周期
Fengfei Ding1, John O'Donnell2, Qiwu Xu2
1Center for Translational Neuromedicine, University of Rochester Medical Center, Rochester, NY 14642, USA. Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
概括
神经调节剂在清醒时增加细胞外 ([K(+) ]e,而睡眠和麻醉会减少它. 细胞外离子变化控制神经活动模式,决定大脑状态.
科学领域:
- 神经科学是一个神经科学.
- 神经生理学 神经生理学
背景情况:
- 清醒依赖于来自上升兴奋系统的神经调节器.
- 这些神经调节器在全球范围内改变神经元活动的机制尚不清楚.
研究的目的:
- 研究神经调节剂和细胞外离子度在调节大脑状态中的作用.
- 为了确定细胞外离子组成是否影响神经活动模式.
主要方法:
- 在皮层切片和体内活体中记录细胞外离子度 ([K(+) ]e,[Ca(2+) ]e,[Mg(2+) ]e,[H(+) ]e) 和细胞外体积.
- 用四毒素对皮层切片进行电静止.
- 在小鼠的清醒,睡眠和麻醉期间比较离子谱.
主要成果:
- 神经调节剂在沉默的皮层切片中增加了细胞外K(+) 度 ([K(+) ]e).
- 在体内,兴奋与增加的[K(+) ]e和减少的[Ca(2+) ]e,[Mg(2+) ]e,[H(+) ]e以及细胞外体积相关.
- 睡眠和麻醉显示了相反的趋势:减少[K(+) ]e,增加其他离子和体积.
- 在睡眠小鼠中改变细胞外离子组成诱导了类似于清醒的脑电图模式.
结论:
- 细胞外离子度,特别是[K(+]e,在编排依赖状态的神经活动中起着至关重要的作用.
- 细胞外离子组成的变化足以在清醒和睡眠模式之间切换.
- 这项研究揭示了一种通过离子动态控制大脑状态的新机制.
更多相关视频
相关概念视频
Sleep-Wake Cycles
3.2K
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:
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
3.2K
Understanding Sleep
1.8K
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...
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...
1.8K
Overview of Synapses
8.8K
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 synapse and bind to...
8.8K
Circadian Rhythms and Gene Regulation
4.7K
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
4.7K
Circadian Rhythms and Gene Regulation
2.5K
2.5K
Management of Insomnia
766
The sleep cycle, an integral part of human health, consists of several stages with distinct characteristics and functions. It begins with a transition from wakefulness to sleep, known as the light sleep phase, followed by the restorative deep sleep phase, essential for physical recovery and growth. The cycle concludes with the Rapid Eye Movement (REM) phase, characterized by high brain activity and vivid dreaming. Insomnia, a prevalent sleep disorder, involves difficulty falling asleep, staying...
766


