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Related Experiment Video

Updated: Jun 10, 2026

Imaging Approaches to Assessments of Toxicological Oxidative Stress Using Genetically-encoded Fluorogenic Sensors
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PCB congener specific oxidative stress response by microarray analysis using human liver cell line.

Supriyo De1, Somiranjan Ghosh, Raghunath Chatterjee

  • 1Department of Biology, Howard University, Washington, DC 20059, United States.

Environment International
|July 20, 2010
PubMed
Summary
This summary is machine-generated.

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Polychlorinated biphenyls (PCBs) induce cell death via oxidative stress. Different PCB congeners, like PCB-77 and PCB-153, trigger distinct molecular pathways leading to apoptosis in liver cells.

Area of Science:

  • Toxicology
  • Molecular Biology
  • Cell Biology

Background:

  • Polychlorinated biphenyls (PCBs) are persistent environmental pollutants with known toxic effects.
  • Understanding the specific mechanisms of PCB congener toxicity, particularly concerning oxidative stress and apoptosis, is crucial for risk assessment.

Purpose of the Study:

  • To investigate the differential effects of two PCB congeners, PCB-77 and PCB-153, on oxidative stress and apoptosis in human liver cells (HepG2).
  • To elucidate the distinct molecular pathways activated by each congener leading to cellular damage.

Main Methods:

  • Exposure of HepG2 cells to PCB-77 and PCB-153 at 70 μM for 0-24 hours.
  • Assessment of apoptosis using fluorescent microscopy.
  • Gene Set Enrichment Analysis (GSEA) to identify enriched pathways.

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  • Paraquat assay to measure oxidative stress levels.
  • Validation of gene expression using Taqman real-time PCR and immunoblotting.
  • In-silico analysis to predict signaling pathways.

    • Main Results:

    • Both PCB-77 and PCB-153 induced significant apoptosis in HepG2 cells after 12 hours of exposure.
    • GSEA identified oxidative stress as a primary response, with PCB-77 exhibiting higher toxicity.
    • Each congener displayed a unique gene expression signature and activated distinct apoptotic pathways.
    • PCB-153 primarily acted through the TNF and Fas receptor pathways.
    • PCB-77 predominantly engaged the aryl hydrocarbon receptor (AhR) and cytochrome P450 (CYP1A1) pathway.

    Conclusions:

    • PCB congeners induce apoptosis through oxidative stress via distinct molecular mechanisms.
    • PCB-77 and PCB-153 exhibit differential toxicity profiles and signaling pathway activation.
    • The findings highlight the importance of considering congener-specific effects in PCB risk assessment.