Polyethylene Microplastics and Human Cells: A Critical Review

Area of Science:

• Environmental Science
• Toxicology
• Cell Biology

Background:

• Microplastics (MPs), particularly from polyethylene (PE), are ubiquitous due to widespread production and poor waste management.
• PE MPs are detected in human biological samples, raising concerns about bioavailability and health impacts.
• These particles persist in the environment and resist degradation, leading to continuous formation.

Purpose of the Study:

• To review the current understanding of polyethylene microplastic (PE MP) presence in biological systems.
• To explore the toxicological effects of PE MPs on human cells and potential health implications.
• To highlight the need for standardized quantification methods and regulatory policies.

Main Methods:

• Review of in vitro studies on the effects of PE MPs on various human cell types (epithelial, immune, neuronal).
• Analysis of findings related to cellular responses such as oxidative stress, inflammation, apoptosis, and epigenetic changes.
• Examination of potential health outcomes linked to PE MP exposure, including cardiovascular and metabolic diseases.

Main Results:

• In vitro studies show PE MPs induce concentration-dependent cytotoxicity, mitochondrial dysfunction, and inflammation.
• PE MPs can disrupt cellular membranes, trigger epithelial-to-mesenchymal transition (EMT), and cause epigenetic dysregulation.
• MPs can carry harmful additives and contaminants, increasing their overall toxicity.

Conclusions:

• PE MPs pose a significant threat to human health, with potential links to various diseases.
• Standardized methods for MP quantification in human samples are urgently needed.
• Reducing PE MP release through improved waste management and biodegradable alternatives is essential to minimize human exposure and health risks.