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Cytochrome reductase activities in rat brain microsomes during development

M Takeshita, M Miki, T Yubisui

    Journal of Neurochemistry
    |October 1, 1982
    PubMed
    Summary

    Microsomal NADH-cytochrome b5 reductase and NADPH-cytochrome c reductase activities in rat brains increase during postnatal development, peaking around 23-30 days. These changes correlate with fatty acid elongation processes in the developing brain.

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    Area of Science:

    • Biochemistry
    • Neuroscience
    • Developmental Biology

    Background:

    • Microsomal reductases, specifically NADH-cytochrome b5 reductase and NADPH-cytochrome c reductase, play crucial roles in cellular metabolic processes.
    • Understanding the developmental trajectory of these enzyme activities in the brain is essential for comprehending neurodevelopmental changes.
    • Fatty acid elongation is a key process in brain development, requiring specific enzymatic machinery.

    Purpose of the Study:

    • To investigate the postnatal developmental changes in microsomal NADH-cytochrome b5 reductase and NADPH-cytochrome c reductase activities in the rat brain.
    • To correlate the developmental patterns of these reductase activities with microsomal fatty acid elongation.
    • To determine the regional distribution of these reductase activities in different brain regions of developing rats.

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    Main Methods:

    • Enzyme activity assays were performed on rat brain microsomes at various postnatal ages.
    • Microsomal fatty acid elongation was assessed to correlate with reductase activity.
    • Specific activities of the reductases were measured in homogenates from cerebral hemispheres, medulla oblongata, midbrain, and cerebellum.

    Main Results:

    • Both NADH-cytochrome b5 reductase and NADPH-cytochrome c reductase activities showed a significant increase from low levels in immature brains to peak levels between 23 and 30 days of postnatal age.
    • The developmental increase in reductase activities coincided with enhanced microsomal fatty acid elongation.
    • Regional analysis in 20-day-old rats revealed highest specific activities in the cerebral hemispheres and medulla oblongata, intermediate levels in the midbrain, and the lowest activities in the cerebellum.

    Conclusions:

    • Microsomal NADH-cytochrome b5 reductase and NADPH-cytochrome c reductase activities undergo significant postnatal development in the rat brain, paralleling fatty acid elongation.
    • The developmental timing and regional distribution suggest a critical role for these reductases in specific brain regions during maturation.
    • These findings provide insights into the biochemical adaptations of the developing brain and their relationship to lipid metabolism.