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Changes in insulin binding activity during myeloid differentiation.

A Palumbo, C Brossa, G Turco

    Endocrinology
    |March 1, 1983
    PubMed
    Summary
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    Immature myeloid cells, including those in chronic myeloid leukemia (CML), have high insulin receptor numbers. Insulin binding decreases as these cells undergo terminal differentiation, whether spontaneous or induced.

    Area of Science:

    • Cell Biology
    • Endocrinology
    • Hematology

    Background:

    • Insulin receptors are crucial for cellular function.
    • Terminal differentiation of myeloid cells involves significant cellular changes.
    • Understanding insulin receptor dynamics during differentiation is important in both normal and malignant hematopoiesis.

    Purpose of the Study:

    • To investigate insulin binding activity during myeloid cell differentiation.
    • To compare insulin receptor characteristics in normal and chronic myeloid leukemia (CML) cells.
    • To assess the impact of both chemical induction and spontaneous differentiation on insulin binding.

    Main Methods:

    • Utilized the HL60 human promyelocytic cell line, inducing differentiation with dimethylsulfoxide.
    • Fractionated myeloid cells from normal bone marrow and CML patients using Ficoll-Hypaque and BSA density gradients.

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  • Quantified and characterized insulin binding activity in different cell fractions and differentiation states.

    • Main Results:

    • HL60 cells and normal myeloid cells possess specific insulin receptors.
    • Dimethylsulfoxide-induced differentiation of HL60 cells led to a progressive decrease in insulin binding.
    • Undifferentiated myeloid cells from CML patients showed higher insulin binding capacity compared to differentiated cells.
    • Insulin binding decreased during both spontaneous CML differentiation and normal myeloid differentiation.

    Conclusions:

    • Leukemic immature myeloid cells exhibit a high number of specific insulin receptors.
    • Insulin binding activity diminishes during terminal differentiation of myeloid cells, irrespective of the induction method (chemical or spontaneous).
    • These findings highlight a distinct insulin receptor profile in immature versus differentiated myeloid cells.