Scientists Discover Why Microplastics Trigger Inflammation

Scientists have discovered the reason why microplastics trigger inflammation, offering a potential explanation for their association with serious health issues like heart attacks, stroke, dementia, and brain tumors. A study published in Nature reveals that microplastics interact with water, generating highly reactive molecules. When plastic fragments into microscopic particles, its surface-to-volume ratio increases dramatically, amplifying any chemical activity.

This heightened reactivity is due to the hydrophobic nature of plastic surfaces, which repel water and prevent hydrogen bonding typically found in liquid form. This alteration in molecular arrangements and local electrical environment results in increased chemical reactivity. The researchers examined various types of microplastics, including polystyrene, polyethylene, polyvinyl chloride, polypropylene, and polyethylene terephthalate.

As microplastics fragment, they create a vast amount of new surface area, leading to heightened toxicity. Prior studies have linked microplastics to inflammation, oxidative stress, and decreased mitochondrial activity, but the new research provides a potential mechanism for these effects by demonstrating that the plastic-water interface can disrupt proteins, cell membranes, and more.

While the study does not directly connect this to human tissue damage, the authors hope to link fundamental interfacial chemistry with quantitative measurements of biological effects to better understand potential health risks.