Co-Exposure to Polystyrene Microplastics and Bisphenol A Contributes to the Formation of Liver Fibrosis in Mice...

Area of Science:

• Environmental Health
• Toxicology
• Molecular Biology

Background:

• Food safety concerns regarding polystyrene microplastics (PS-MPs) and bisphenol A (BPA) are globally significant.
• The combined toxicological impact of PS-MPs and BPA on mammalian liver function is not well understood.

Purpose of the Study:

• To investigate the synergistic toxic effects of PS-MPs and BPA coexposure on liver cells and mouse livers.
• To elucidate the molecular mechanisms underlying PS-MP and BPA-induced liver damage.

Main Methods:

• Utilized AML12 cells and mouse models for in vitro and in vivo studies.
• Performed histopathological staining to assess liver tissue changes.
• Quantified the expression levels of Bmal1 and E-cad genes.
• Conducted luciferase reporter assays to examine gene regulation.

Main Results:

• Coexposure to PS-MPs and BPA demonstrated synergistic toxicity in AML12 cells and mouse livers.
• Histopathology revealed excessive extracellular matrix accumulation, indicative of fibrosis.
• Bmal1 and E-cad gene expression were downregulated following coexposure.
• BMAL1 and CLOCK overexpression enhanced E-cad gene activity, suggesting a regulatory role.

Conclusions:

• Coexposure to PS-MPs and BPA promotes liver fibrosis by suppressing the BMAL1/E-cad signaling pathway.
• The study identifies a novel mechanism of toxicity for these prevalent environmental contaminants.
• Findings highlight the critical need for assessing combined exposure risks in food safety.