Toxic vascular effects of polystyrene microplastic exposure

Area of Science:

• Environmental Science
• Toxicology
• Cardiovascular Medicine

Background:

• Microplastic pollution, particularly from polystyrene microplastics (PSMPs), is a global concern.
• While PSMP toxicity is studied in various organs, its impact on vascular toxicity remains poorly understood.
• Vascular calcification (VC) is a significant risk factor for cardiovascular disease.

Purpose of the Study:

• To investigate the vascular toxicity of microplastics (MPs).
• To explore the association between MP levels in human feces and thoracic aortic calcification.
• To examine the effects of PSMP exposure on VC, gut microbiota, and intestinal health in rats.

Main Methods:

• Human fecal samples analyzed for 7 polymer types, comparing patients with and without thoracic aortic calcification.
• Correlation analysis between MP abundance (total, polypropylene, polystyrene) and VC scores.
• Animal study exposing rats to PSMPs, assessing VC, gut microbiota composition, intestinal inflammation, and barrier function.

Main Results:

• Patients with VC had higher levels of total MPs, polypropylene (PP), and polystyrene (PS) in feces.
• Significant positive correlations were found between VC score and fecal abundance of total MPs, PP, and PS.
• PSMP exposure induced mild VC in normal rats and aggravated VC in VDN-treated rats, alongside gut dysbiosis and intestinal damage.

Conclusions:

• Human exposure to microplastics, specifically polystyrene, is associated with vascular calcification.
• PSMP exposure poses a risk to cardiovascular health by inducing vascular calcification and disrupting gut homeostasis.
• This study provides a basis for assessing the cardiovascular risks associated with microplastic exposure.