Polystyrene nanoplastics cause developmental abnormalities, oxidative damage and immune toxicity in early zebrafish...

Area of Science:

• Environmental Toxicology
• Nanotoxicology
• Aquatic Ecotoxicology

Background:

• Aquatic ecosystems face increasing contamination from polystyrene nanoplastics (PSNPs).
• PSNPs pose risks to aquatic organisms, potentially disrupting development, inducing oxidative stress, and impairing immune function.

Purpose of the Study:

• To investigate the effects of PSNP exposure on zebrafish (Danio rerio) embryos.
• To assess developmental abnormalities, oxidative stress, and immune toxicity induced by PSNPs.

Main Methods:

• Zebrafish embryos were exposed to PSNPs at concentrations of 0.01, 0.1, 1, and 10 µg/mL from 2 to 120 hours post-fertilization (hpf).
• Evaluated developmental endpoints, PSNP accumulation in tissues, swimming behavior, and gene expression related to oxidative stress and immunity.

Main Results:

• PSNP exposure caused dose-dependent developmental abnormalities, including delayed hatching, reduced survival, smaller body length, and smaller eye diameter.
• PSNPs accumulated in various tissues, impaired swimming performance, induced oxidative damage via altered antioxidant gene expression, and triggered immune toxicity through dysregulated immune gene expression.
• Observed interconnected impacts of developmental defects, oxidative stress, and immune responses.

Conclusions:

• PSNPs induce significant developmental abnormalities, oxidative stress, and immune toxicity in zebrafish embryos.
• The findings underscore the systemic risks of nanoplastics contamination in aquatic environments.
• Highlights the need for further research into the long-term ecological consequences of PSNPs.