A recent study from the University of Rhode Island's College of Pharmacy has shed light on the potential health impacts of micro- and nanoplastics, particularly concerning brain health and cognitive decline. These tiny plastic particles are ubiquitous in the environment and can enter the human body through various channels, including drinking water, food, and air.
The research, led by assistant professor Jaime Ross, builds upon earlier findings that demonstrated microplastics' ability to penetrate bodily systems, including the blood-brain barrier. The latest study explored the effects of these plastic particles on cognitive function, particularly in mice genetically modified to carry the APOE4 gene, a known risk factor for Alzheimer’s disease. Mice with the APOE4 variant are 3.5 times more likely to develop Alzheimer’s compared to those with the APOE3 variant.
During the study, mice were exposed to microplastics through their drinking water for three weeks. Following this exposure, behavioral tests indicated significant changes in cognitive abilities. Notably, male mice exhibited increased exploration of open areas, while female mice showed slower recognition of novel objects, both behaviors indicative of cognitive decline.
The findings suggest that exposure to microplastics may influence cognitive health, particularly in individuals carrying genetic predispositions for Alzheimer's. Ross emphasizes the need for further research into the relationship between microplastic exposure and cognitive decline, especially given the prevalence of these particles in the environment.
In light of these results, the Microplastics Safety Act has been introduced in Congress to investigate the human health impacts of microplastics, aiming to address potential risks to vulnerable populations and promote regulatory action. Ross advocates for increased funding and awareness regarding the health effects of microplastics to inform public policy and safeguard public health.