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Mitochondrial/cytosolic carbon transfer in the developing rat brain

T B Patel, J B Clark

    Biochimica Et Biophysica Acta
    |November 5, 1981
    PubMed
    Summary

    Ketone bodies are effective precursors for brain biosynthesis in suckling rats, but less so in adults. Citrate and acetoacetate efflux rates from mitochondria vary with development and substrate.

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    Area of Science:

    • Biochemistry
    • Neuroscience
    • Developmental Biology

    Background:

    • Mitochondrial function is crucial for brain energy metabolism and biosynthesis.
    • Understanding substrate utilization and efflux in developing brain mitochondria is key to comprehending metabolic shifts.

    Purpose of the Study:

    • To investigate developmental changes in citrate and acetoacetate efflux from rat brain mitochondria.
    • To compare efflux rates between free and synaptic mitochondria using various substrates.
    • To assess the impact of phenylpyruvate on efflux rates.

    Main Methods:

    • Studied citrate and acetoacetate efflux from rat brain mitochondria (free and synaptic).
    • Utilized different substrates: pyruvate, 3-hydroxybutyrate, and acetoacetate.
    • Examined developmental changes from postnatal to adult stages and effects of phenylpyruvate.

    Main Results:

    • Acetoacetate efflux showed no significant difference between free and synaptic mitochondria; citrate efflux was higher in free mitochondria.
    • Acetoacetate efflux peaked at weaning (21 days) and decreased by 50% in adults when using 3-hydroxybutyrate + malate.
    • Citrate efflux showed minimal change with development using 3-hydroxybutyrate + malate, but doubled from 5-20 days with pyruvate + malate.
    • Phenylpyruvate inhibited both acetoacetate and citrate efflux in adult and 21-day-old rat brain mitochondria.

    Conclusions:

    • Ketone bodies are effective precursors for cytosolic biosynthetic activities in suckling rat brain, potentially surpassing glucose.
    • In adult rat brain, ketone bodies are less efficient precursors for biosynthetic activities compared to suckling rats.
    • Developmental stage significantly influences substrate utilization and efflux patterns in brain mitochondria.

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