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Chronic exposure to LED lighting impairs prefrontal cortex-dependent cognitive functions in adolescent rats
Jing Wang1,2, Xiaona Wang1,2,3, Yingying Han2
1Department of Neurology, the Second Affiliated Hospital, Jiangxi Province Key Laboratory of Brain Science and Brian Health, School of Basic Medical Sciences, Jiangxi Medical College, Nanchang University, Nanchang, 330031, Jiangxi, China.
Chronic exposure to Light-emitting diodes (LEDs) impairs cognitive functions in rats by affecting social interaction and memory. This may be due to reduced myelination in the medial prefrontal cortex (mPFC).
Area of Science:
- Neuroscience
- Cognitive Science
- Ophthalmology
Background:
- Light-emitting diodes (LEDs) are widely used for lighting.
- Previous research suggests potential physiological impacts of chronic LED exposure.
- The effect of LED lighting on cognitive functions is not well understood.
Purpose of the Study:
- To investigate the impact of chronic LED exposure on cognitive functions in an animal model.
- To explore the underlying neural mechanisms, specifically myelination in the medial prefrontal cortex (mPFC).
Main Methods:
- Sprague-Dawley (SD) rats were exposed to LED light daily for one month.
- Cognitive functions were assessed using social interaction, Morris water maze, and sound-location-association tasks.
- Immunohistochemical and Western blot analyses were used to examine myelination and oligodendrocyte levels in the mPFC.
Main Results:
- Chronic LED exposure significantly impaired social interaction ability.
- Spatial learning, memory, and auditory-spatial associative learning were negatively affected.
- A reduction in myelination and mature oligodendrocytes was observed in the mPFC.
Conclusions:
- Chronic LED exposure can impair cognitive functions dependent on the medial prefrontal cortex (mPFC).
- These impairments may be linked to a downregulation of myelin integrity in the mPFC.