Impacts of microplastics on immunity.

Area of Science:

• Environmental Science
• Immunology
• Toxicology

Background:

• Disposable plastic products degrade into microplastics (MPs) and nanoplastics (NPs), presenting environmental risks.
• While MP toxicology in marine life and mammals is studied, human immune system impacts require urgent investigation.
• MPs interact with the environment and human body, triggering immune responses and immunotoxicity.

Purpose of the Study:

• To review the production and environmental interactions of MPs.
• To elucidate the mechanisms of MP interaction with the human immune system, focusing on immunotoxicity.
• To highlight the need for comprehensive research on MP immunotoxicity.

Main Methods:

• Literature review on MP generation, environmental fate, and biological interactions.
• Analysis of cellular uptake mechanisms and subsequent disruption of intracellular signaling pathways.
• Examination of toxicological pathways, including reactive oxygen species generation, DAMPs, TLRs, and cytokine production.

Main Results:

• MPs can be internalized by cells, disrupting immune homeostasis and causing tissue damage.
• Reactive oxygen species generation is a key mechanism, leading to inflammatory responses.
• Formation of a protein-corona enhances MP toxicity by binding pollutants and pathogens.

Conclusions:

• MPs can disrupt intracellular signaling, alter immune homeostasis, and induce immunotoxicity.
• Further research is crucial to understand the immunological hazards of MPs, considering various factors like composition, size, and concentration.
• Urgent investigation into human immunological risks from MP exposure is necessary.