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Related Experiment Videos

Rat liver hexokinases during development.

T Ureta, R Bravo, J Babul

    Enzyme
    |January 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Rat liver glucose-phosphorylating isozymes show a sequential developmental pattern. Isozymes A, B, and C peak early, while isozyme D matures later, with distinct particulate activity in newborns.

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    Area of Science:

    • Biochemistry
    • Developmental Biology
    • Enzymology

    Background:

    • Glucose phosphorylation is a critical step in glucose metabolism.
    • Isozymes of glucose-phosphorylating enzymes play distinct roles in cellular function.
    • Understanding the developmental regulation of these isozymes is crucial for metabolic studies.

    Purpose of the Study:

    • To investigate the developmental expression patterns of four glucose-phosphorylating isozymes in rat liver.
    • To characterize the temporal appearance and activity changes of these isozymes during postnatal development.
    • To examine the association of glucose phosphorylating activity with particulate fractions during development.

    Main Methods:

    • DEAE-cellulose column chromatography was employed for the separation of rat liver glucose-phosphorylating isozymes.

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  • Enzyme activity assays were performed on samples from rats at various developmental ages.
  • Particulate fractions were analyzed for glucose phosphorylating activity.

    • Main Results:

    • A sequential mode of appearance for isozymes A, B, and C was observed, with peak activities at days +1, +3, and +7, respectively.
    • Isozyme D activity was detected later, rising from day +18 to reach adult levels by day +30.
    • Particulate glucose phosphorylating activity, composed of three low-Km isozymes, was present in prenatal and newborn rats but diminished by day +15.

    Conclusions:

    • Rat liver glucose-phosphorylating isozymes exhibit distinct developmental expression profiles.
    • The developmental transition involves changes in both soluble and particulate enzyme forms.
    • These findings highlight the dynamic regulation of glucose metabolism during early life stages.