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Updated: May 26, 2025

Author Spotlight: Investigating the Effects of Compounds on Intestinal Tissue Using 3D Human Cell Line Models
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Exposure of Polystyrene Nano- and Microplastics in Increasingly Complex In Vitro Intestinal Cell Models.

Kristen A Marcellus1, David Prescott1, Michal Scur1

  • 1Regulatory Toxicology Research Division, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, Ottawa, ON K1A 0K9, Canada.

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|February 25, 2025
PubMed
Summary
This summary is machine-generated.

Polystyrene microplastics did not harm intestinal cells but could be internalized and translocated. Further research is needed to understand human exposure risks from microplastics (MNPLs).

Keywords:
barrier integrityintestinal cellsmicroplasticsnanoplasticspolystyrene

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Area of Science:

  • Environmental Science
  • Toxicology
  • Cell Biology

Background:

  • Microplastics (MNPLs) are emerging environmental contaminants due to increased plastic production.
  • Human exposure and health impacts of MNPLs are not well understood, despite detection in human tissues.
  • Previous studies suggest potential toxicity of MNPLs in mammalian models.

Purpose of the Study:

  • To investigate the impact of polystyrene nano- and microplastics on intestinal cell models.
  • To assess particle internalization, cytotoxicity, barrier integrity, and translocation in varying cell culture complexities.

Main Methods:

  • Utilized undifferentiated Caco-2 mono-culture, differentiated mono-culture, and tri-culture transwell models.
  • Assessed particle association, cytotoxicity, clearance/retention, membrane integrity, and translocation.
  • Examined polystyrene particles of varying sizes (nano- and microplastics).

Main Results:

  • Only 50 nm and 500 nm polystyrene particles were internalized by undifferentiated cells.
  • No cytotoxicity was observed at any tested concentrations.
  • Particles did not impact barrier integrity, but 50 nm particles translocated, attenuated by a mucus layer in tri-culture models.

Conclusions:

  • Polystyrene MNPLs show low toxicity and limited internalization in intestinal models.
  • Translocation of smaller particles occurs, potentially reduced by mucus.
  • Further research is essential to fully comprehend human MNPL exposure risks.