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A modified screening method for estimating erythrocyte glucose phosphate isomerase.

J E Smith, M S Lee

    Canadian Journal of Comparative Medicine : Revue Canadienne De Medecine Comparee
    |January 1, 1974
    PubMed
    Summary

    This study presents a new fluorimetric method for estimating erythrocyte glucose phosphate isomerase activity using small blood volumes. The assay is adaptable for various animal species, facilitating comparative biochemical studies.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Clinical Chemistry

    Background:

    • Erythrocyte glucose phosphate isomerase (GPI) is a key enzyme in glycolysis.
    • Accurate measurement of GPI activity is important for understanding red blood cell metabolism and related disorders.
    • Existing methods may require larger sample volumes or lack adaptability across species.

    Purpose of the Study:

    • To develop and describe a novel fluorimetric assay for quantifying erythrocyte glucose phosphate isomerase (GPI) activity.
    • To optimize the method for use with minimal blood samples.
    • To ensure the assay's applicability to diverse animal species.

    Main Methods:

    • A hemolysate was prepared by lysing erythrocytes with water.
    • The hemolysate was incubated with a reaction mixture containing Tris-HCl buffer, MgCl2, nicotinamide adenine dinucleotide phosphate (NADP+), glucose-6-phosphate dehydrogenase (G6PD), and fructose-6-phosphate.

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  • Nicotinamide adenine dinucleotide phosphate fluorescence was measured, and hemoglobin concentration was determined spectrophotometrically for normalization.

    • Main Results:

    • A sensitive fluorimetric method for erythrocyte GPI estimation was successfully established.
    • The assay requires only a small volume of blood (5 µL).
    • The method demonstrated applicability across various animal species, accommodating differing GPI activity levels.

    Conclusions:

    • The described fluorimetric technique provides a reliable and efficient means to measure erythrocyte GPI activity.
    • Its low sample volume requirement and interspecies adaptability make it a valuable tool for research.
    • This method facilitates comparative studies of glycolysis and enzyme kinetics in red blood cells.