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ipRGCs Sensitive Blue Light Exposure Promotes the Robustness of Circadian and Neural Stem Cells in Sleep Deprived

Zhaoting Bu1,2,3, Xiaotong Li1, Jinyu Shi1,2,3

  • 1Department of Neuroimmunology and Antibody Engineering, Beijing Institute of Basic Medical Sciences, Beijing 100850, China.

Stem Cells International
|August 1, 2025
PubMed

Insights

Exposure to 480 nm blue light helps mice with sleep deprivation by stabilizing clock genes, improving activity, and reducing anxiety. This light therapy may also enhance cognitive function and neural stem cell gene expression.

Area of Science:

  • Neuroscience
  • Chronobiology
  • Light Therapy

Background:

  • Sleep deprivation (SD) disrupts circadian rhythms, potentially leading to emotional and cognitive disorders.
  • Light therapy is used for circadian disorders, but its biological mechanisms and optimal treatments require further investigation.

Purpose of the Study:

  • To investigate the effects of 480 nm blue light, targeting intrinsically photosensitive retinal ganglion cells (ipRGCs), on circadian rhythms, emotional and cognitive behaviors, and neural stem cell (NSC) gene expression in mice experiencing acute SD.
  • To explore the potential of blue light as a therapeutic strategy for SD-induced behavioral and molecular disruptions.

Main Methods:

  • Mice subjected to 24-hour acute sleep deprivation (SD).
  • Exposure to 480 nm blue light (~1300 lux, 30 min) twice daily (8:00 a.m. and 8:00 p.m.).
  • Assessment of circadian clock gene stability, nocturnal activity, anxiety-like behaviors, cognitive abilities, and NSC stemness gene expression.

Main Results:

  • Blue light exposure stabilized disrupted clock genes and increased nocturnal activity in SD mice.
  • A significant reduction in anxiety-like behaviors and enhancement of cognitive abilities were observed.
  • 480 nm blue light mitigated fluctuations in NSC stemness gene expression induced by SD, possibly by enhancing suprachiasmatic nucleus (SCN) circadian oscillation amplitude.

Conclusions:

  • 480 nm blue light effectively ameliorates circadian rhythm disruption, anxiety, and cognitive deficits caused by acute sleep deprivation in mice.
  • This light therapy may offer a novel strategy for managing circadian rhythm-related disorders by influencing NSC stemness and SCN oscillations.
Keywords:
blue lightcircadian rhythmneural stem cellssleep deprivation

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