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Related Experiment Videos

Dynein/dynactin regulate metaphase spindle length by targeting depolymerizing activities to spindle poles.

Jedidiah Gaetz1, Tarun M Kapoor

  • 1Laboratory of Chemistry and Cell Biology, The Rockefeller University, 1230 York Ave., Box 202, New York, NY 10021, USA.

The Journal of Cell Biology
|August 18, 2004
PubMed
Summary

Dynein/dynactin and NuMA regulate spindle length by coordinating microtubule dynamics at spindle poles. This coordination involves targeting Kif2a for microtubule depolymerization, crucial for maintaining constant spindle length during cell division.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Metaphase spindles maintain constant length during cell division.
  • Spindle microtubules exhibit continuous poleward flux, involving tubulin addition, lattice transport, and depolymerization.
  • Coordination mechanisms for these dynamic processes remain largely unknown.

Purpose of the Study:

  • To investigate the roles of dynein/dynactin and NuMA in regulating spindle length and microtubule flux.
  • To elucidate the coordination between microtubule depolymerization and transport during poleward flux.

Main Methods:

  • Fluorescent speckle microscopy was employed to visualize microtubule dynamics.
  • Inhibition of dynein/dynactin and NuMA was performed to assess their effects on spindle length and flux.

Related Experiment Videos

  • Kif2a inhibition was used to study its role in microtubule depolymerization.

    • Main Results:

    • Dynein/dynactin and NuMA inhibition suppressed microtubule disassembly at spindle poles but did not affect poleward microtubule sliding.
    • This uncoupling indicates that depolymerization is not essential for poleward flux-associated transport.
    • Kif2a inhibition led to increased spindle microtubule length.
    • Dynein/dynactin were found to target Kif2a to spindle poles.

    Conclusions:

    • Dynein/dynactin and NuMA are key regulators of spindle length.
    • These motor complexes coordinate spindle length and flux by ensuring microtubule depolymerizing activities, like Kif2a, are localized to spindle poles.