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Endocrine disruptor, dioxin (TCDD)-induced mitochondrial dysfunction and apoptosis in human trophoblast-like JAR

Su-Chee Chen1, Tien-Ling Liao, Yau-Huei Wei

  • 1Department of Obstetrics and Gynecology, Cathay General Hospital, Taipei, Taiwan, ROC.

Molecular Human Reproduction
|January 20, 2010
PubMed

Insights

2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) causes oxidative damage and mitochondrial dysfunction in human trophoblast cells. These effects lead to apoptosis, potentially explaining TCDD

Area of Science:

  • Reproductive Toxicology
  • Cell Biology
  • Environmental Health

Background:

  • 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is an endocrine disruptor with known adverse effects on human reproduction.
  • Mechanisms underlying TCDD's impact on early human implantation remain poorly understood.

Purpose of the Study:

  • To investigate the link between mitochondrial dysfunction and TCDD-induced toxicity in human trophoblast-like cells (JAR cells).
  • To elucidate the cellular pathways affected by TCDD exposure relevant to implantation.

Main Methods:

  • Assessed TCDD effects on JAR cell viability, reactive oxygen species (ROS) generation, and oxidative damage markers (lipid peroxides, 8-hydroxy-2'-deoxyguanosine).
  • Quantified mitochondrial parameters including mitochondrial DNA (mtDNA) copy number, ATP content, and mtDNA mutations.
  • Analyzed protein expression of apoptosis-related factors (p53, Bax, Bcl2, cytochrome c, caspase 3).

Main Results:

  • TCDD exposure significantly increased oxidative damage, including lipid peroxidation and DNA oxidation.
  • Mitochondrial dysfunction was evident, characterized by reduced mtDNA copy number, decreased ATP levels, and increased mtDNA deletions.
  • TCDD induced apoptosis via p53 accumulation, Bax overexpression, cytochrome c release, and caspase 3 activation.

Conclusions:

  • Oxidative damage and mitochondrial dysfunction are key mechanisms mediating TCDD-induced apoptosis in human trophoblast-like cells.
  • These findings provide insights into the detrimental effects of TCDD on early human implantation.

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