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Fatty acid oxidation by developing rat kidney.

N Freund, M Sedraoui, J P Geloso

    Biology of the Neonate
    |January 1, 1984
    PubMed
    Summary
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    The developing rat kidney shows limited fatty acid oxidation in utero. This capacity significantly increases after birth, peaking during the suckling period, suggesting a link to nutritional supply.

    Area of Science:

    • Biochemistry
    • Developmental Biology
    • Renal Physiology

    Background:

    • Free fatty acids (FFA) are crucial substrates for mature kidney function.
    • The metabolic capabilities of the developing kidney, particularly regarding FFA oxidation, are not fully understood.

    Purpose of the Study:

    • To investigate the in vitro fatty acid oxidation capacity of the developing rat kidney.
    • To determine how renal FFA oxidation changes during the perinatal period and its potential relation to nutritional status.

    Main Methods:

    • Kidney slices from fetal and postnatal rats (days 1-30) were incubated with U-14C-palmitate.
    • Palmitate uptake and oxidation to CO2 were measured after 90 minutes.
    • Experiments included varying palmitate concentrations and maternal starvation models.

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    Main Results:

    • Fetal rat kidneys exhibited low palmitate uptake and oxidation.
    • Both uptake and oxidation increased significantly after birth, reaching maximum levels between days 5 and 10 postpartum.
    • Maternal starvation during gestation enhanced palmitate oxidation in fetal kidney slices.

    Conclusions:

    • The developing rat kidney gains significant capacity for free fatty acid oxidation postnatally.
    • This developmental trajectory suggests that nutritional supply plays a critical role in establishing renal FFA oxidation during the perinatal period.