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Primary changes in liver damage by aspirin in rats
T Tomoda1, T Kurashige, Y Hayashi
1Department of Pediatrics, Kochi Medical School, Japan. tomodat@kochi-ms.ac.jp
Acta Paediatrica Japonica : Overseas Edition
|January 20, 1999
Summary
Acetylsalicylic acid (ASA) causes liver damage through mechanisms that were previously unclear. Early indicators include mitochondrial dysfunction and specific lamellar structures in bile canaliculi, suggesting a sensitive marker for liver injury.
Area of Science:
- Hepatology
- Toxicology
- Biochemistry
Background:
- Acetylsalicylic acid (ASA) is known to induce liver cell damage.
- The precise mechanisms underlying ASA-induced hepatotoxicity remain largely unknown.
Purpose of the Study:
- To elucidate the earliest cellular and ultrastructural changes in the liver following oral administration of ASA.
- To identify sensitive indicators of ASA-induced liver injury.
Main Methods:
- Rats were orally administered ASA at 50 mg/kg and 150 mg/kg bodyweight for 7 days.
- Mitochondria were isolated for respiration measurements.
- Liver tissue was examined using electron microscopy for ultrastructural changes.
Main Results:
- Uncoupling of oxidative phosphorylation was observed in mitochondria from ASA-treated rats.
- Ultrastructural examination revealed lamellar structures in bile canaliculi in all ASA-treated rats.
- No overt histological changes were evident at the light microscopy level.
Conclusions:
- Lamellar structures in bile canaliculi represent a sensitive ultrastructural marker for early ASA-induced liver damage.
- These structures are negative for bilirubin staining, distinguishing them from other potential causes of liver injury.