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Ionic regulation of MEL cell commitment.

R Levenson, I Macara, L Cantley

    Journal of Cellular Biochemistry
    |January 1, 1983
    PubMed
    Summary
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    Dimethyl sulfoxide (DMSO) and other inducers initiate murine erythroleukemia (MEL) cell differentiation through a common pathway. This pathway involves the modulation of cytoplasmic calcium levels, crucial for erythroid cell commitment.

    Area of Science:

    • Cellular Biology
    • Molecular Biology
    • Biochemistry

    Background:

    • Dimethyl sulfoxide (DMSO) is a known inducer of murine erythroleukemia (MEL) cell differentiation.
    • A rise in cytoplasmic calcium ions is a key event in DMSO-induced MEL cell differentiation.

    Purpose of the Study:

    • To investigate if other inducers of terminal erythroid differentiation also utilize a calcium-dependent pathway.
    • To determine the role of calcium ions in the commitment of MEL cells to differentiation.

    Main Methods:

    • Inhibition of calcium transport in MEL cells.
    • Enhancement of calcium flux rate using A23187.
    • Elevation of cytoplasmic calcium levels using FCCP.
    • Assessment of MEL cell commitment to erythroid differentiation.

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    Main Results:

    • Inhibition of calcium transport prevented MEL cell commitment induced by DMSO, butyric acid (BA), and hypoxanthine (HX).
    • Enhancing calcium flux or elevating cytoplasmic calcium levels stimulated the kinetics of commitment for all tested inducers.
    • These findings indicate a common mechanism involving calcium modulation for DMSO, BA, and HX induced differentiation.

    Conclusions:

    • The terminal erythroid differentiation program in MEL cells, induced by DMSO, BA, or HX, is initiated via a common calcium-dependent pathway.
    • Cytoplasmic calcium levels play a critical role in the commitment phase of erythroid differentiation.
    • Modulation of calcium flux is a key mechanism underlying the action of these differentiation inducers.