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Protein kinases in human leukemic cells.

F Phan-Dinh-Tuy, J Henry, C Boucheix

    American Journal of Hematology
    |July 1, 1985
    PubMed
    Summary

    Leukemic cells show increased casein kinase 2 (CK2) activity and cyclic AMP (cAMP) binding capacity, linked to proliferation rather than cell type. These changes suggest a role in leukemia development.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Hematology

    Background:

    • Protein kinases and cyclic AMP (cAMP) binding proteins play crucial roles in cellular signaling.
    • Alterations in these pathways are implicated in various cancers, including leukemia.
    • Understanding these molecular changes can provide insights into leukemia pathogenesis.

    Purpose of the Study:

    • To investigate protein kinase activities and cAMP binding capacity in human leukemic cells compared to normal controls.
    • To determine if specific kinase activities or cAMP binding patterns are altered in different types of leukemia.
    • To correlate observed molecular changes with cellular proliferation and differentiation status.

    Main Methods:

    • Assessed protein kinase activities using [gamma 32P] ATP as a phosphoryl donor on artificial substrates.
    • Measured GTP-dependent casein kinase 2 (CK2) activity.
    • Quantified cyclic AMP (cAMP) binding capacity and identified regulatory subunits.
    • Compared findings in peripheral blood cells from patients with acute myelogenous leukemia (AML) and chronic myelogenous leukemia in blastic crisis (BC-CML) against normal controls.

    Main Results:

    • General protein phosphorylating activities were similar between normal and leukemic cells.
    • GTP-dependent casein kinase 2 (CK2) activity was significantly elevated in proliferating myeloblastic cells from AML and BC-CML patients, unlike normal granulocytes.
    • Endogenous phosphotyrosine levels did not differ significantly between leukemic and normal cells.
    • cAMP binding capacity was increased in proliferating leukemic cells, primarily due to higher levels of the R1 regulatory subunit of cAMP-dependent protein kinases.
    • Distinct cAMP binding protein patterns in normal cells became less defined in leukemic cells.

    Conclusions:

    • Elevated CK2 activity and increased cAMP binding capacity are characteristic of proliferating human leukemic cells.
    • These molecular alterations appear to be associated with increased proliferation or impaired differentiation, rather than the specific cellular origin of the leukemia.
    • The findings suggest that targeting these pathways could be a potential therapeutic strategy for leukemia.

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