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Characteristics of hepatic excretory function during development.

S Z Cagen, J E Gibson

    The Journal of Pharmacology and Experimental Therapeutics
    |July 1, 1979
    PubMed
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    Young rats show immature hepatic excretory function, with impaired ouabain transport limiting liver function. This functional insufficiency in neonates improves with age, reaching adult levels by 35 days old.

    Area of Science:

    • Hepatology
    • Developmental Biology
    • Pharmacology

    Background:

    • Hepatic excretory function is crucial for drug metabolism and detoxification.
    • Understanding the developmental trajectory of liver function is vital for predicting drug responses in neonates.

    Purpose of the Study:

    • To characterize the developmental changes in hepatic excretory function in rats.
    • To identify the key determinants of functional insufficiency in young rats.

    Main Methods:

    • Investigated the transport of ouabain and sulfobromophthalein (BSP) in rats of different ages (15 to 45 days).
    • Utilized bile duct ligation and bile salt infusion to assess excretory capacity.
    • Measured plasma and intestinal ouabain concentrations, and plasma disappearance of BSP.

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    Main Results:

    • 15-day-old rats exhibited lower intestinal ouabain content and higher plasma concentrations compared to older rats.
    • Impaired ouabain transport in neonates correlated with low initial liver ouabain concentration.
    • Bile duct ligation and bile salt infusion had less impact on BSP and ouabain transport in 15-day-old rats than in adult rats.
    • Hepatic uptake of ouabain was slower in young rats, potentially limiting overall transport function.

    Conclusions:

    • Hepatic excretory function, particularly ouabain transport, is immature in 15-day-old rats.
    • The inability of young rats to efficiently accumulate ouabain in the liver is a key factor in their functional insufficiency.
    • Hepatic uptake rate, rather than transport into bile, appears to be the primary determinant of limited excretory function in young rats.