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Bile secretory function: a determinant of adriamycin disposition
Archives Internationales De Pharmacodynamie Et De Therapie
|June 1, 1980
Summary
Adriamycin (ADR) is primarily eliminated via bile in rats. Bile flow reduction significantly impairs ADR elimination, increasing plasma and tissue drug levels.
Area of Science:
- Pharmacokinetics
- Drug Metabolism
- Toxicology
Background:
- Adriamycin (ADR) is an important chemotherapeutic agent.
- Understanding ADR's elimination pathways is crucial for managing its toxicity.
Purpose of the Study:
- To investigate the primary routes of Adriamycin (ADR) excretion in rats.
- To determine the impact of altered bile flow on ADR disposition.
Main Methods:
- Intravenous injection of Adriamycin (ADR) in anesthetized rats.
- Collection and analysis of bile and urine samples.
- Induction of cholestasis using sodium taurolithocholate.
- Renal elimination blockade via kidney ligation.
Main Results:
- ADR is extensively eliminated in bile (26.6%) and moderately in urine (4.4%) within 3 hours.
- Inhibition of bile flow significantly reduced biliary excretion of ADR equivalents.
- Reduced biliary excretion led to increased urinary excretion and overall reduced drug elimination.
- Cholestasis resulted in significantly elevated plasma and tissue ADR levels.
Conclusions:
- Biliary excretion is the predominant route for Adriamycin (ADR) elimination in rats.
- Impaired bile flow significantly alters ADR pharmacokinetics, leading to drug accumulation and potential toxicity.