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Glutamine metabolism in bone.

R M Biltz, J M Letteri, E D Pellegrino

    Mineral and Electrolyte Metabolism
    |January 1, 1983
    PubMed
    Summary

    Rat calvaria and compact bone actively transport and metabolize glutamine. This amino acid serves as a precursor for ammonia, glutamate, other amino acids, and carbon dioxide in bone tissue.

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    Area of Science:

    • Biochemistry
    • Bone Physiology
    • Cellular Metabolism

    Background:

    • Glutamine is a key amino acid with diverse metabolic roles.
    • Bone tissue's metabolic pathways are not fully elucidated.
    • Understanding nutrient utilization in bone is crucial for skeletal health.

    Purpose of the Study:

    • To investigate glutamine utilization by rat calvaria and compact bone.
    • To identify the specific metabolic pathways involved in glutamine degradation in bone.
    • To determine the products of glutamine metabolism in bone.

    Main Methods:

    • Studied active transport of glutamine into bone cells.
    • Assayed glutamine degradation by phosphate-dependent glutaminase.
    • Measured enzyme kinetics and pH optima.
    • Utilized glutamine analogs to inhibit enzyme activity.
    • Quantified ammonia and CO2 production from labeled glutamine.
    • Assessed activities of related enzymes like glutamate dehydrogenase and transaminases.

    Main Results:

    • Glutamine is actively transported into bone via sodium-dependent mechanisms.
    • Phosphate-dependent glutaminase degrades glutamine into ammonia and glutamate.
    • Enzyme kinetics and pH optima for glutaminase were characterized.
    • Inhibition studies confirmed the role of glutaminase and transaminases.
    • Glutamine metabolism yields ammonia, glutamate, amino acids, and carbon dioxide.

    Conclusions:

    • Glutamine is a significant metabolic substrate for rat bone.
    • Phosphate-dependent glutaminase, transaminases, and citric acid cycle are key to bone glutamine metabolism.
    • These pathways contribute to bone's production of essential metabolites.

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