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Related Concept Videos

Photoreceptors and Visual Pathways01:22

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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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Investigating Migraine-Like Behavior Using Light Aversion in Mice
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Short-wavelength artificial light affects visual neural pathway development in mice.

Xuhong Zhang1, Xiaoyu Wang2, Hong Zhu1

  • 1Department of Ophthalmology, the First Affiliated Hospital of Zhejiang University, Hangzhou, Zhejiang Province, China.

Ecotoxicology and Environmental Safety
|July 26, 2023
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Short wavelength artificial light exposure during early development delays visual pathway maturation in mice. This impacts ocular development, visual function, and neural circuitry, highlighting potential health risks of modern lighting.

Keywords:
MRNA sequencingNeurotransmitter transportSynapsesViolet lightVisual development

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Developmental Biology

Background:

  • Modern life relies heavily on artificial light, which can negatively impact health.
  • Short-wavelength artificial light, particularly violet light, is implicated in various health issues, including ocular and mental problems.
  • The precise effects of artificial light spectrum on the developing mammalian visual neuronal pathway remain poorly understood.

Purpose of the Study:

  • To investigate how different artificial light spectra influence the development of the visual neuronal pathway in mice.
  • To assess the impact of short-wavelength light on ocular development, visual function, and retinal neuronal structure.

Main Methods:

  • C57BL/6 mice were exposed to full-spectrum white, violet, or green light from eye opening (7:00-19:00).
  • Ocular axial dimensions, visual acuity, retinal electrical activity, cone density, retinal ganglion cell density, and axonal structures were assessed.
  • Gene expression analysis (KEGG and GO enrichment) was performed to identify affected pathways.

Main Results:

  • Short-wavelength light exposure led to shorter ocular axial length, reduced visual acuity, and impaired retinal electrical activity.
  • S-cone density decreased, while amacrine cells showed increased activation.
  • Axonal terminals in the lateral geniculate nucleus (LGN) became less clustered, and genes related to neural circuitry and neurotransmitter function were differentially expressed.

Conclusions:

  • Early-stage exposure to short-wavelength artificial light delays visual pathway development in mice.
  • Alterations in axon terminus structure and neurotransmitter function appear to be key consequences.
  • Green light showed minimal effects, suggesting wavelength-specific impacts on visual system development.