Environmental exposure enhances the internalization of microplastic particles into cells

Area of Science:

• Environmental Science
• Toxicology
• Cell Biology

Background:

• Microplastic particles are pervasive environmental contaminants ingested by diverse organisms.
• Translocation of microplastics from the gastrointestinal tract to tissues is suspected, potentially via cellular internalization.
• The mechanisms driving microplastic cellular internalization remain largely unknown.

Purpose of the Study:

• To investigate whether environmental exposure influences microplastic cellular internalization.
• To identify factors on environmentally exposed microplastics that promote cellular uptake.
• To elucidate the role of cellular internalization in microplastic tissue translocation.

Main Methods:

• Comparison of cellular internalization rates of environmentally exposed versus pristine microplastic particles in macrophages.
• Identification of biomolecules forming an eco-corona on environmentally exposed microplastics using surface analysis techniques.

Main Results:

• Environmentally exposed microplastic particles exhibited significantly higher internalization rates into macrophages compared to pristine particles.
• Biomolecules forming an eco-corona were identified on the surface of environmentally exposed microplastics.
• Cellular internalization was confirmed as a primary route for microplastic translocation into tissues.

Conclusions:

• Environmental exposure, through the formation of an eco-corona, enhances microplastic cellular internalization.
• Cellular internalization is a critical mechanism for microplastic translocation into organismal tissues.
• Understanding microplastic-cell interactions is crucial for assessing environmental and human health risks.