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Pristine and artificially-aged polystyrene microplastic particles differ in regard to cellular response.

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Weathered microplastic particles cause broader adverse reactions in cells than pristine ones. This highlights the need for realistic particle testing in microplastic risk assessment.

Keywords:
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Area of Science:

  • Environmental Science
  • Toxicology
  • Cell Biology

Background:

  • Microplastic particles (MP) are a global environmental concern.
  • Current cytotoxicity studies often use pristine MP, not environmentally weathered ones.
  • Limited data exists on the biological impact of weathered MP on mammalian cells.

Purpose of the Study:

  • To compare the cytotoxicity of pristine and weathered microplastic particles.
  • To investigate the cellular and molecular responses to different MP types.
  • To emphasize the importance of using realistic MP in risk assessments.

Main Methods:

  • Murine macrophages were exposed to polystyrene MP.
  • MP were either pristine or artificially weathered (aged up to 130 days).
  • Physicochemical characterization, cytotoxicity assays, transcriptome analysis, and metabolic pathway prediction were performed.

Main Results:

  • Pristine MP exposure primarily induced TNF-α release.
  • Weathered MP, characterized by sharp edges, triggered more extensive adverse cellular reactions.
  • Transcriptome and metabolic pathway analyses revealed distinct responses to pristine versus weathered MP.

Conclusions:

  • Weathered microplastic particles elicit a more severe cellular response than pristine particles.
  • The physical characteristics of MP (e.g., sharp edges) significantly influence cytotoxicity.
  • Future microplastic risk assessments should incorporate realistic, weathered particles and comprehensive biological assays.