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Polystyrene microplastics induce mitochondrial damage in mouse GC-2 cells.

Tao Liu1, Baolian Hou1, Zhiping Wang1

  • 1Department of Occupational and Environmental Health, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China.

Ecotoxicology and Environmental Safety
|April 30, 2022
PubMed
Summary

Polystyrene microplastics (PS-MPS) cause sperm damage by harming mitochondria in mouse cells. This study reveals PS-MPS mitochondrial toxicity, impacting ATP, membrane potential, and DNA, offering insights into male reproductive health risks.

Keywords:
ATPAutophagyMitochondrialPolystyrene MicroplasticsROS

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Area of Science:

  • Environmental Science
  • Toxicology
  • Cell Biology

Background:

  • Microplastics (MPs) are pervasive environmental contaminants.
  • Exposure to MPs poses potential human health risks.
  • Polystyrene microplastics (PS-MPS) are linked to mouse sperm damage, but mechanisms are unclear.

Purpose of the Study:

  • To investigate the mitochondrial toxicity of 5 µm PS-MPS in GC-2 cells (mouse spermatocyte line).
  • To elucidate the mechanism of PS-MPS-induced sperm damage.

Main Methods:

  • Exposure of GC-2 cells to 5 µm PS-MPS.
  • Assessment of mitochondrial function: ATP content, membrane potential, genome integrity.
  • Analysis of mitochondrial dynamics (fusion/fission) and autophagy pathways (PINK1/Parkin).
  • Evaluation of oxidative stress and time-series effects.

Main Results:

  • PS-MPS exposure decreased ATP content and mitochondrial membrane potential.
  • Mitochondrial genome integrity was compromised, and homeostasis of mitochondrial dynamics was disrupted.
  • The PINK1/Parkin autophagy pathway was activated, indicating cellular response to damage.
  • PS-MPS induced mitochondrial damage via oxidative stress, with partial functional recovery observed.

Conclusions:

  • Polystyrene microplastics exhibit significant mitochondrial toxicity.
  • This toxicity contributes to sperm damage, highlighting reproductive health concerns.
  • Findings provide a mechanistic basis for understanding PS-MPS effects on male fertility.