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Hepatobiliary function in senescent male Sprague-Dawley rats
J A Handler1, C A Genell, R S Goldstein
1Department of Toxicology, SmithKline Beecham Pharmaceuticals, King of Prussia, Pennsylvania 19406.
Hepatology (Baltimore, Md.)
|June 1, 1994
Summary
Aging impairs bile flow due to reduced canalicular and ductular function in rat livers. Senescent livers show decreased bile acid transport and lower oxygen uptake, impacting overall hepatobiliary function.
Area of Science:
- Hepatology
- Aging Research
- Physiology
Background:
- Age-related decline in bile flow can impact liver health.
- Understanding intrahepatic mechanisms of aging is crucial for liver function.
Purpose of the Study:
- To investigate age-related changes in bile acid-dependent and -independent bile flow.
- To evaluate the effects of aging on canalicular versus ductular flow and hepatic tight junction permeability.
Main Methods:
- Isolated perfused rat liver model (young vs. senescent).
- Assessed oxygen uptake, bile acid transport, canalicular flow (14C-erythritol clearance), and tight junction permeability (tritiated inulin, horseradish peroxidase).
Main Results:
- Senescent rat livers exhibited significantly lower oxygen uptake (75 vs. 121 mumol/gm/hr).
- Total bile flow and 14C-erythritol clearance were reduced in senescent livers, indicating decreased canalicular flow.
- Bile acid-dependent and -independent flow decreased by 50% and 60%, respectively. Hepatocellular uptake and excretion of taurocholate were also reduced by approximately 50%.
Conclusions:
- Aging significantly impairs intrinsic hepatobiliary function, leading to reduced bile flow.
- Decreased canalicular function and impaired bile acid transport are key factors in age-related reductions in bile flow.