Polystyrene Microplastics Trigger Liver Damage Through Impaired Mitochondrial Biogenesis and Mitochondrial Dynamics

Area of Science:

• Environmental Toxicology
• Molecular Biology
• Hepatology

Background:

• Polystyrene microplastics (PS-MPs) are pervasive environmental contaminants.
• Evidence suggests systemic toxicity, but mechanisms of hepatic effects are unclear.

Purpose of the Study:

• Investigate hepatotoxic effects of PS-MPs.
• Elucidate mechanisms: bioaccumulation, mitochondrial homeostasis, inflammation, apoptosis, and liver function.

Main Methods:

• Animal exposure to varying PS-MP concentrations.
• Analysis of liver tissues: GC-MS, biochemical assays, histopathology, molecular analyses.
• Principal Component Analysis for data interpretation.

Main Results:

• PS-MPs accumulate in the liver, especially at higher doses (20 and 40 μg).
• Exposure caused significant liver dysfunction (elevated enzymes, altered protein levels) and histopathological damage.
• Activated inflammatory (NF-κB) and apoptotic (caspase-3) pathways.
• Dysregulated mitochondrial homeostasis genes (biogenesis, fusion, mitophagy markers).

Conclusions:

• PS-MPs induce significant hepatotoxicity.
• Mechanisms involve impaired mitochondrial homeostasis and activated inflammatory/apoptotic pathways.
• The liver is a primary target for microplastic toxicity, warranting further investigation.