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Related Concept Videos

Insufficient Sleep and Sleep Deprivation01:13

Insufficient Sleep and Sleep Deprivation

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Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
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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...
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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...
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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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.
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Related Experiment Video

Updated: Jun 23, 2025

Establishing a Device for Sleep Deprivation in Mice
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Sleep deprivation induces corneal endothelial dysfunction by downregulating Bmal1.

Yani Wang1,2,3, Qun Wang1,2,3, Shengqian Dou1,2,3

  • 1Eye Institute of Shandong First Medical University, Qingdao Eye Hospital of Shandong First Medical University, 5 Yan er dao Road, Qingdao, 266071, China.

BMC Ophthalmology
|June 21, 2024
PubMed
Summary

Sleep deprivation impairs corneal endothelial function by downregulating the core clock gene Bmal1, leading to mitochondrial dysfunction. Restoring Bmal1 levels can protect against this damage.

Keywords:
Bmal1Corneal endotheliumMitochondrial functionSleep deprivation

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Area of Science:

  • Ophthalmology
  • Sleep Medicine
  • Cell Biology

Background:

  • Sleep deprivation (SD) is a widespread issue linked to health problems and increased ocular disease risk.
  • The impact of sleep loss on corneal endothelial function is not well understood.
  • This study investigates how SD affects the corneal endothelium and its underlying mechanisms.

Purpose of the Study:

  • To determine the effect of sleep deprivation on corneal endothelial function.
  • To elucidate the mechanism by which sleep deprivation impacts the corneal endothelium.
  • To investigate the role of the core clock gene Bmal1 in this process.

Main Methods:

  • Established sleep deprivation models in male C57BL/6J mice.
  • Assessed corneal endothelial barrier and pump functions, mitochondrial function, and expression of ZO-1, Atp1a1, and core clock genes.
  • Utilized Bmal1 knockdown and overexpression in vivo and in vitro, including mitochondrial stress tests.

Main Results:

  • Sleep deprivation damaged corneal endothelial barrier and pump functions, causing mitochondrial dysfunction.
  • SD significantly downregulated the core clock gene Bmal1.
  • Bmal1 knockdown worsened endothelial dysfunction, while Bmal1 overexpression ameliorated SD-induced damage.

Conclusions:

  • Downregulation of Bmal1 by SD impairs mitochondrial bioenergetics, leading to corneal endothelial dysfunction.
  • This study provides insights into how sleep loss affects corneal endothelium physiology.
  • Findings expand understanding of sleep deprivation's role in ocular diseases.