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Developmental changes in rat blood choline concentration

S H Zeisel, R J Wurtman

    The Biochemical Journal
    |September 15, 1981
    PubMed
    Summary
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    Neonatal rats have high serum choline levels due to milk intake. This concentration decreases with age as choline metabolism shifts, with increased conversion to betaine in mature rats.

    Area of Science:

    • Biochemistry
    • Developmental Biology
    • Nutritional Science

    Background:

    • Serum choline concentration is notably high in newborn rats, declining to adult levels by 20 days.
    • Rat milk is a primary source of choline for pups, influencing their serum concentrations.

    Purpose of the Study:

    • To investigate the contribution of dietary intake to neonatal rat serum choline levels.
    • To characterize the metabolic fate and age-dependent changes in choline conversion in rats.

    Main Methods:

    • Comparison of serum choline concentrations in fed versus milk-deprived rat pups.
    • In vivo and in vitro studies to determine choline half-life and metabolic conversion rates.
    • Assay of choline oxidase activity (choline dehydrogenase and betaine aldehyde dehydrogenase) at different ages.

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    Main Results:

    • Rat pups denied milk had significantly lower serum choline.
    • In vivo, choline has a half-life of 70 minutes and is converted to betaine, phosphocholine, and phosphatidylcholine.
    • Phosphocholine formation rate is constant, while betaine formation rate increases with age, paralleling increased choline oxidase activity.

    Conclusions:

    • Dietary choline intake is crucial for maintaining high serum choline in neonatal rats.
    • Age-related increases in choline metabolism, particularly conversion to betaine, contribute to the decline in unesterified choline concentration.
    • Enzyme activity of choline metabolism, including choline dehydrogenase, increases with age in rats.