A recent study conducted by researchers at the University of California, Riverside, has highlighted a potential link between microplastic exposure and the development of atherosclerosis, a condition that narrows arteries and is associated with heart attacks and strokes. The research, published in the journal Environment International, utilized a mouse model to investigate how microplastics—tiny plastic particles found in various environmental contexts—may influence cardiovascular health.
The study focused on LDLR-deficient mice, which are commonly used to study atherosclerosis. Over a nine-week period, male and female mice were exposed daily to microplastics at levels reflective of those found in contaminated food and water. Results indicated that male mice exhibited a significant increase in plaque formation in their arteries compared to their female counterparts, with a 63% increase in plaque at the aortic root and a 624% increase in the brachiocephalic artery. Notably, this increase in plaque did not correlate with changes in body weight or cholesterol levels, suggesting that traditional risk factors were not at play.
The research team discovered that microplastics disrupted the function of endothelial cells, which line the arteries and play a crucial role in regulating inflammation and circulation. These microplastics were found to activate gene pathways in endothelial cells that promote atherosclerosis, indicating a possible direct contribution to cardiovascular disease.
Lead researcher Changcheng Zhou emphasized the need for further investigation into the reasons behind the sex-specific effects observed and the molecular mechanisms involved. The study underscores the urgency of understanding the health implications of rising microplastic pollution, with plans for future research to explore how various types of microplastics affect vascular health differently in humans. The study received partial funding from the National Institutes of Health.