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Microplastics Decrease the Toxicity of 137Cs in the Zebrafish Embryo-Larva.

Fangni Du1,2,3, Wenjun Zhao4, Shaofei Cao1,2,3

  • 1China Institute for Radiation Protection, Taiyuan 030006, China.

Toxics
|April 27, 2026
PubMed
Summary
This summary is machine-generated.

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Radionuclides like cesium-137 (137Cs) and microplastics (MPs) pose environmental risks. This study found 137Cs harms zebrafish development, but MPs may reduce its toxic effects by absorbing the radionuclide.

Area of Science:

  • Environmental Toxicology
  • Ecotoxicology
  • Aquatic Toxicology

Background:

  • Radionuclides and microplastics (MPs) are prevalent environmental contaminants.
  • Their combined toxicological risks in aquatic ecosystems are poorly understood.
  • Understanding co-exposure effects is crucial for ecological risk assessment.

Purpose of the Study:

  • To investigate the toxicological effects of 137Cs and PS-MPs co-exposure on zebrafish embryos.
  • To elucidate the underlying mechanisms of toxicity and potential interactions.
  • To assess the ecological risks associated with these co-contaminants.

Main Methods:

  • Zebrafish embryos were exposed to 137Cs and polystyrene MPs (PS-MPs) for 7 days.
  • Developmental endpoints (hatching, behavior) and transcriptomic profiles were analyzed.
Keywords:
137Csecological risksmicroplasticstoxicityzebrafish embryos

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  • KEGG enrichment analysis identified affected biological pathways.

    • Main Results:

    • 137Cs exposure significantly impaired zebrafish development, causing delayed hatching and altered swimming behavior.
    • Transcriptomic analysis revealed widespread gene expression changes in 137Cs-exposed groups, particularly affecting lipid metabolism.
    • MPs showed a potential protective effect by absorbing 137Cs, reducing internal irradiation and toxicity.
    • 137Cs-induced lipid metabolism toxicity may explain neuro-related gene alterations and behavioral abnormalities.

    Conclusions:

    • Combined exposure to 137Cs and MPs presents complex ecological risks.
    • 137Cs induces developmental and behavioral toxicity in zebrafish via lipid metabolism disruption.
    • MPs may mitigate 137Cs toxicity through radionuclide absorption during early development.
    • Further research is needed to fully understand the long-term implications of these co-contaminants.