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Updated: Jun 27, 2026

Retrograde Labeling of Retinal Ganglion Cells in Adult Zebrafish with Fluorescent Dyes
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Cadmium affects retinogenesis during zebrafish embryonic development.

Elly Suk Hen Chow1, Michelle Nga Yu Hui, Chi Wa Cheng

  • 1Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China.

Toxicology and Applied Pharmacology
|December 23, 2008
PubMed
Summary

Cadmium exposure in zebrafish embryos causes microphthalmia (small eyes) and blindness by disrupting retinal development and optic nerve formation. This study reveals cellular mechanisms behind cadmium-induced ocular malformations and visual impairment.

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Area of Science:

  • Developmental toxicology
  • Neuroscience
  • Ophthalmology

Background:

  • Ocular malformations are common in aquatic species exposed to toxicants.
  • Zebrafish embryos are a sensitive model for studying developmental toxicity.

Purpose of the Study:

  • To investigate the effects of cadmium exposure on zebrafish eye development and visual function.
  • To determine the cellular basis of cadmium-induced microphthalmia and blindness.

Main Methods:

  • Zebrafish embryos were exposed to cadmium from sphere to segmentation stage.
  • Eye development, retinal cell differentiation, and retinotectal projections were analyzed.
  • Behavioral assays assessed visual abilities.

Main Results:

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  • Cadmium exposure induced microphthalmia and behavioral blindness.
  • Reduced retinal progenitor cells and retinal ganglion cells (RGCs) were observed.
  • Photoreceptor cells were absent, RGC axons were reduced, and optic nerves were disrupted.

Conclusions:

  • Cadmium impairs neuronal differentiation in the retina, affecting RGC axon formation and cone photoreceptor development.
  • These disruptions lead to microphthalmia and visual impairment in zebrafish embryos.
  • Cadmium acts as a potent teratogen affecting ocular development and visual system integrity.