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1,1-Dichloroethylene: an apoptotic hepatotoxin?
Environmental Health Perspectives
|August 1, 1984
Summary
1,1-dichloroethylene causes early liver cell damage, including apoptosis-like changes in hepatocytes before widespread necrosis. This toxic effect impacts bile canaliculi and mitochondria within two hours in fasted rats.
Area of Science:
- Hepatotoxicity
- Cellular Biology
- Toxicology
Background:
- 1,1-dichloroethylene is a known hepatotoxin.
- Understanding the early cellular mechanisms of its toxicity is crucial for developing interventions.
Purpose of the Study:
- To investigate the initial cellular and subcellular alterations in rat livers following 1,1-dichloroethylene administration.
- To determine the temporal sequence of damage and identify specific cellular targets.
Main Methods:
- Administration of 1,1-dichloroethylene to fasted rats.
- Histochemical staining for enzyme activity localization.
- Microscopic examination of liver tissue for ultrastructural changes.
Main Results:
- Early (within 2 hr) liver damage included bile canaliculi dilation/disruption, mitochondrial matrix changes, and plasma membrane alterations.
- Selective enzyme activity loss occurred at canalicular and mitochondrial membranes.
- Hepatocytes showed apoptosis-like features (chromatin aggregation, blebbing) preceding detectable plasma membrane leakiness.
Conclusions:
- 1,1-dichloroethylene initiates apoptosis-like degradation in hepatocytes.
- This process occurs before or concurrently with centrolobular necrosis.
- Early cellular damage precedes significant plasma membrane permeability changes.