Silver nanoparticles affect lens rather than retina development in zebrafish embryos

Area of Science:

• Developmental toxicology
• Nanomaterial safety
• Zebrafish embryogenesis

Background:

• Silver nanoparticles (AgNPs) are known to affect erythroid cell, chromatophore, and myofibril development in zebrafish embryos.
• Limited data exists on the specific effects of AgNPs on ocular development, particularly lens formation.

Purpose of the Study:

• To investigate the biological effects of AgNPs on zebrafish eye development, with a focus on lens formation.
• To elucidate the mechanisms underlying AgNP-induced eye abnormalities.

Main Methods:

• Zebrafish embryos were exposed to or injected with 0.4 mg/L AgNPs.
• Morphological changes in eye formation were assessed.
• Gene expression of lens crystallin isoforms and retinal genes was analyzed.
• Cell apoptosis and nuclear DNA/RNA export were examined in lens cells.

Main Results:

• No significant morphological changes in overall eye formation were observed.
• Clefts and vacuoles were identified in the lenses of AgNP-exposed embryos.
• Down-regulated expression of lens crystallin isoform genes was detected, while retinal gene expression remained normal.
• No significant cell apoptosis or blockage of nuclear DNA/RNA export was observed in lens cells.

Conclusions:

• AgNPs specifically inhibit zebrafish lens development rather than retinal development.
• AgNPs induce lens abnormalities through mechanisms independent of apoptosis or impaired nuclear export.
• Further research is needed to understand the precise molecular pathways involved in AgNP-induced lens damage.