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A rapid decrease in epidermal growth factor-binding capacity accompanies the terminal differentiation of mouse

R W Lim, S D Hauschka

    The Journal of Cell Biology
    |February 1, 1984
    PubMed
    Summary
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    Specific mitogens drive cell growth, but their depletion triggers differentiation. Mouse myoblasts lose epidermal growth factor receptor (EGFR) binding capacity during differentiation, becoming unresponsive to growth signals.

    Area of Science:

    • Cell Biology
    • Developmental Biology
    • Molecular Biology

    Background:

    • Mitogens stimulate cell proliferation and inhibit differentiation.
    • Upon mitogen depletion, myoblasts differentiate and lose responsiveness to growth factors.
    • Understanding receptor dynamics during this transition is crucial.

    Purpose of the Study:

    • To investigate the behavior of mitogen receptors during the transition from proliferation to terminal differentiation in mouse myoblasts.
    • To use the epidermal growth factor receptor (EGFR) as a model to study these changes.

    Main Methods:

    • Examined epidermal growth factor receptor (EGFR) binding capacity in mouse myoblasts under varying mitogen conditions.
    • Assessed EGF internalization and degradation.
    • Correlated EGFR availability with cell cycle status and differentiation state.

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    Main Results:

    • Proliferating myoblasts exhibited high EGF binding.
    • EGF binding capacity rapidly declined upon mitogen depletion, becoming irreversible upon differentiation.
    • Within 24 hours, EGF binding decreased to less than 5% of original levels.
    • EGFR loss was linked to differentiation, not starvation or cell cycle arrest.

    Conclusions:

    • Specific reduction in mitogen receptors, like EGFR, occurs during terminal differentiation.
    • This receptor downregulation may be a mechanism rendering differentiating cells refractory to mitogenic stimulation.
    • These findings provide insights into cell fate decisions and growth factor signaling.