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Related Experiment Videos

Non-esterified fatty acids may regulate human leucocyte sodium pump activity.

L L Ng, T D Hockaday

    Clinical Science (London, England : 1979)
    |December 1, 1986
    PubMed
    Summary

    Human leucocyte sodium pump activity, measured by 22Na+ efflux, is inversely related to fasting non-esterified fatty acids. Glucose intake increases pump activity and decreases fatty acids, while linoleic acid inhibits it.

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    Area of Science:

    • Biochemistry
    • Human Physiology
    • Cellular Biology

    Background:

    • The sodium pump (Na+,K+-ATPase) is crucial for cellular ion balance.
    • Non-esterified fatty acids (NEFAs) are implicated in regulating cellular functions.
    • The direct impact of NEFAs on human leucocyte sodium pump activity requires elucidation.

    Purpose of the Study:

    • To investigate the relationship between human leucocyte sodium pump activity and plasma NEFA levels.
    • To determine the effect of glucose loading on leucocyte sodium pump activity and NEFA levels.
    • To examine the in vitro effect of NEFAs on leucocyte sodium pump activity.

    Main Methods:

    • Measurement of ouabain-sensitive 22Na+ efflux rate constants in human leucocytes.
    • Assessment of plasma NEFA levels in fasting subjects.
    • Evaluation of leucocyte Na+,K+-ATPase activity after in vitro incubation with NEFAs.

    Main Results:

    • A significant inverse correlation was observed between leucocyte 22Na+ efflux rate and fasting plasma NEFA levels (rs = -0.73).
    • Oral glucose administration increased leucocyte sodium pump activity and decreased plasma NEFA levels.
    • In vitro incubation with linoleic acid significantly inhibited leucocyte ouabain-sensitive 22Na+ efflux and Na+,K+-ATPase activity.

    Conclusions:

    • Fasting plasma NEFA levels are inversely related to human leucocyte sodium pump activity.
    • Glucose intake enhances leucocyte sodium pump activity, potentially mediated by a reduction in NEFAs.
    • NEFAs, particularly unsaturated ones, can directly inhibit leucocyte Na+,K+-ATPase activity, suggesting a role in plasma-mediated inhibition.

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