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Bone marrow: its contribution to heme catabolism.

Y Mähönen, M Anttinen, P Vuopio

    Annals of Clinical Research
    |January 1, 1976
    PubMed
    Summary

    Bone marrow heme catabolism enzymes, heme oxygenase (HO) and biliverdin reductase (BR), show adaptive regulation in various anemias and leukemias. These findings highlight the bone marrow

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    Area of Science:

    • Biochemistry
    • Hematology
    • Enzymology

    Background:

    • Heme oxygenase (HO) and biliverdin reductase (BR) are key enzymes in heme degradation.
    • Bone marrow plays a role in heme catabolism.
    • Understanding enzymatic capacity in hematologic disorders is crucial.

    Purpose of the Study:

    • To determine the enzymatic capacity of bone marrow for heme catabolism.
    • To compare heme oxygenase (HO) and biliverdin reductase (BR) activities in normal individuals and patients with various hematologic disorders.
    • To investigate the adaptive regulation of these enzymes in bone marrow.

    Main Methods:

    • Bone marrow aspirates were collected from normal individuals and patients with chronic leukemia (CL), acute leukemia (AL), refractory sideroblastic anemia (RA), iron-deficiency anemia (IA), hemolytic anemia (HA), and secondary anemia (SA).
    • Heme oxygenase (HO) and biliverdin reductase (BR) activities were measured using spectrophotometric assays.
    • Enzyme activities were quantified as nmoles of bilirubin per 10 mg protein per minute.

    Main Results:

    • Heme oxygenase (HO) activity was significantly elevated in chronic leukemia (CL) and hemolytic anemia (HA) compared to normal controls.
    • Biliverdin reductase (BR) activity was markedly increased in chronic leukemia (CL), hemolytic anemia (HA), and secondary anemia (SA).
    • Acute leukemia (AL) and iron-deficiency anemia (IA) showed HO and BR activities comparable to normal individuals.

    Conclusions:

    • Bone marrow heme oxygenase (HO) and biliverdin reductase (BR) activities demonstrate adaptive regulation in response to different hematologic conditions.
    • The bone marrow plays a significant physiological role in heme catabolism.
    • Altered HO and BR activities may serve as indicators of specific hematologic disorders.

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