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Related Concept Videos

Cholesterol: Significance and Regulation01:29

Cholesterol: Significance and Regulation

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Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
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Insufficient Sleep and Sleep Deprivation01:13

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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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Line Loss01:10

Line Loss

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The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss.
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Reducing Line Loss01:18

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In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
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Stages of Sleep01:22

Stages of Sleep

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Sleep progresses through distinct stages, each characterized by specific brain wave patterns and physiological responses ranging from wakefulness to stages of non-rapid eye movement, known as non-REM, to rapid eye movement, referred to as REM. Understanding these stages helps in recognizing how sleep supports various bodily and cognitive functions.
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Nervous Tissue: Myelin01:25

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The myelin sheath is a multilayered lipid and protein covering that insulates the axon of a neuron, enhancing the speed of nerve impulse conduction. Axons without this sheath are referred to as unmyelinated. Two types of neuroglia, Schwann cells in the peripheral nervous system (PNS) and oligodendrocytes in the central nervous system (CNS) are responsible for producing myelin sheaths.
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Drug-Induced Sleep Endoscopy DISE with Target Controlled Infusion TCI and Bispectral Analysis in Obstructive Sleep Apnea
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Sleep loss induces cholesterol-associated myelin dysfunction.

Reyila Simayi1,2, Eleonora Ficiarà1,2, Oluwatomisin Faniyan2,3

  • 1School of Pharmacy, University of Camerino, Camerino 62032, Italy.

Proceedings of the National Academy of Sciences of the United States of America
|January 20, 2026
PubMed
Summary
This summary is machine-generated.

Sleep deprivation impairs myelin integrity, leading to nerve signal delays and cognitive deficits. Restoring cholesterol transport to myelin can reverse these effects, revealing a new therapeutic target for sleep loss.

Keywords:
myelinoligodendrocytesleepwhite matter

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Public Health

Background:

  • Sleep deprivation is a growing public health concern with known behavioral impacts like reduced alertness.
  • The underlying biological mechanisms linking sleep loss to behavioral impairment are not fully understood.

Purpose of the Study:

  • To investigate the biological consequences of sleep deprivation on myelin integrity and nerve signal propagation.
  • To identify molecular pathways, particularly lipid metabolism, affected by sleep loss.
  • To explore potential interventions targeting these pathways.

Main Methods:

  • Assessed myelin integrity and nerve signal propagation in sleep-deprived models.
  • Analyzed oligodendrocyte transcriptome and lipidome to identify molecular changes.
  • Investigated the effect of modulating cholesterol transport on behavioral outcomes.

Main Results:

  • Sleep deprivation significantly impacts myelin integrity, causing increased nerve conduction delays and hindered interhemispheric synchronization.
  • Oligodendrocyte transcriptome and lipidome profiling revealed endoplasmic reticulum stress and dysregulated lipid metabolism, specifically cholesterol homeostasis.
  • Enhancing cholesterol transport to myelin sheaths ameliorated sleep deprivation-induced deficits in nerve signal propagation and behavior.

Conclusions:

  • Oligodendrocyte cholesterol dysregulation plays a crucial role in the behavioral deficits associated with sleep deprivation.
  • Targeting cholesterol homeostasis in oligodendrocytes presents a novel therapeutic strategy for mitigating sleep loss consequences.