Effects of pristine or contaminated polyethylene microplastics on zebrafish development

Area of Science:

• Environmental Science
• Ecotoxicology
• Aquatic Biology

Background:

• Microplastics (MP) are pervasive environmental contaminants.
• Organic pollutants adsorbed onto MPs pose risks to aquatic ecosystems and human health.
• The biological impact of pristine and contaminated MPs on aquatic organisms requires further investigation.

Purpose of the Study:

• To evaluate the biological effects of pristine and benzo[α]pyrene-contaminated polyethylene microplastics (MP-BaP) on zebrafish (Danio rerio).
• To assess the impact on growth, reproduction, skeletal development, and intergenerational effects.

Main Methods:

• Zebrafish larvae were chronically exposed to pristine MP and MP-BaP via diet.
• Growth parameters, fecundity, egg morphology, skeletal development, and bone quality were assessed at various time points.
• Histological analysis of the gut and gene expression analysis were performed.

Main Results:

• Long-term exposure to MP and MP-BaP impaired zebrafish growth and skeletal development.
• MP-BaP significantly affected reproductive parameters and caused intergenerational bone formation impairment.
• Intestinal inflammation and altered gene expression related to pollutant response and oxidative stress were observed.

Conclusions:

• Pristine and contaminated microplastics pose significant risks to aquatic organisms.
• Long-term exposure can lead to severe health issues, including intergenerational effects.
• This study highlights the urgent need to address microplastic pollution in aquatic environments.