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Related Experiment Videos

Dynamics of microtubule depolymerization in monocytes.

L U Cassimeris, P Wadsworth, E D Salmon

    The Journal of Cell Biology
    |June 1, 1986
    PubMed
    Summary
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    Human monocytes show that microtubule depolymerization begins with slow initiation, then rapid disassembly. Two microtubule populations exist: a labile majority and a persistent minority, revealing asynchronous depolymerization dynamics.

    Area of Science:

    • Cell Biology
    • Cytoskeleton Dynamics

    Background:

    • Interphase microtubules in human monocytes are sparse.
    • Understanding microtubule depolymerization is crucial for cell function.

    Purpose of the Study:

    • To investigate the kinetics and dynamics of microtubule depolymerization in human monocytes.
    • To identify the rate-limiting steps and heterogeneity in microtubule disassembly.

    Main Methods:

    • Human monocytes were treated with nocodazole or cold shock to inhibit microtubule assembly.
    • Anti-tubulin immunofluorescence microscopy and intensified video imaging were used.
    • Microtubule length and number were quantified using digitized tracings from microscopy images.

    Main Results:

    • Microtubule depolymerization involved rapid loss of total polymer and number, with slow decrease in average length.

    Related Experiment Videos

  • The rate-limiting step was the initiation of disassembly, followed by rapid, catastrophic depolymerization.
  • Two distinct microtubule populations were identified: 70% labile and 30% persistent, showing asynchronous depolymerization initiation.

    • Conclusions:

    • Microtubule depolymerization in monocytes is initiated slowly but proceeds rapidly, with significant heterogeneity.
    • A labile microtubule population dominates, while a persistent subpopulation exhibits slower depolymerization rates.
    • These findings highlight the complex and asynchronous nature of microtubule dynamics in human monocytes.