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Brain microvessel hexokinase: kinetic properties.

B M Djuricić, B B Mrsulja

    Experientia
    |February 15, 1979
    PubMed
    Summary

    Brain capillary and parenchymal hexokinase exhibit distinct kinetic properties. These differences in enzyme kinetics suggest the presence of two unique hexokinase enzymes within the brain

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    Area of Science:

    • Biochemistry
    • Neuroscience
    • Enzymology

    Background:

    • Hexokinase is a critical enzyme in glucose metabolism.
    • Understanding hexokinase function is vital for brain energy homeostasis.
    • Distinct hexokinase isoforms may exist in different brain cell types.

    Purpose of the Study:

    • To investigate the kinetic differences between brain capillary and parenchymal hexokinase.
    • To elucidate the impact of various substrates and conditions on hexokinase activity.

    Main Methods:

    • Enzyme kinetic assays were performed.
    • Hexokinase activity was measured in the presence of glucose, ATP, fructose, potassium, and sodium.
    • Experiments were conducted at varying pH levels.

    Main Results:

    • Parenchymal hexokinase showed greater susceptibility to glucose inhibition compared to capillary hexokinase.
    • Parenchymal hexokinase demonstrated higher tolerance to ATP concentration variations.
    • Increased fructose and potassium concentrations inhibited parenchymal hexokinase more significantly.
    • Parenchymal hexokinase exhibited greater activity at lower pH values.

    Conclusions:

    • Kinetic properties of brain capillary and parenchymal hexokinase are demonstrably different.
    • The findings strongly suggest the existence of two distinct hexokinase enzymes in brain parenchyma and endothelial cells of microvessels.

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