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Polystyrene microplastics internalization by term placental chorionic villi explants.

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Polystyrene microplastics (MPs) can enter and distribute within placental tissue, penetrating deep into villi without damaging the barrier. Further research is needed to understand the health implications of this placental microplastic uptake.

Keywords:
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Area of Science:

  • Environmental Science
  • Toxicology
  • Reproductive Biology

Background:

  • Microplastics (MPs) are emerging environmental contaminants found in human tissues, including the placenta.
  • The presence of MPs in the placenta raises concerns about potential placental barrier crossing and fetal exposure.

Purpose of the Study:

  • To investigate the placental barrier penetration and distribution of polystyrene (PS)-MPs in term placental chorionic villi explants.
  • To analyze the interaction of PS-MPs with placental tissues and explore potential internalization mechanisms.

Main Methods:

  • Term placental chorionic villi explants were exposed to 5 μm-size PS-MPs (100 μg/mL) for up to 72 hours.
  • Analysis of MP internalization and distribution was performed using optical microscopy, confocal atomic force microscopy (C-AFM), and fluorescence confocal imaging.

Main Results:

  • Polystyrene MPs were found to traverse the placental barrier, adsorbing to the surface and internalizing within the syncytiotrophoblast and chorionic villi mesenchyme.
  • MPs were observed up to 120 μm deep within the villi, surrounded by actin, suggesting active internalization mechanisms.
  • No evidence of placental barrier disruption or membrane rupture was observed during MP internalization.

Conclusions:

  • This study demonstrates that PS-MPs can penetrate placental tissue without compromising barrier integrity.
  • Urgent investigation is required to understand the implications of MP internalization on placental homeostasis and potential adverse effects on fetal development.
  • Further research should focus on elucidating MP internalization mechanisms and their physiological impacts in placental tissues.