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Related Experiment Videos

In vitro depolymerization dynamics of brain endogenous microtubules.

L A López1, L S Mayorga, F Bertini

  • 1Instituto de Histología y Embriología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina.

Journal of Cellular Biochemistry
|July 1, 1990
PubMed
Summary

Some microtubules depolymerize in glycerol-deficient media, while others stabilize due to released factors. This study investigated microtubule stability and depolymerization dynamics.

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Area of Science:

  • Cell Biology
  • Biochemistry

Background:

  • Microtubules are dynamic polymers essential for cellular functions.
  • Understanding microtubule stability is crucial for cell biology research.

Purpose of the Study:

  • To investigate the depolymerization dynamics of endogenous microtubules in a cell-free system.
  • To identify factors influencing microtubule stability and depolymerization.

Main Methods:

  • Differential centrifugation of rat brain homogenates to isolate microtubule fractions.
  • Monitoring microtubule depolymerization by measuring sedimentable tubulin and electron microscopy.
  • Assessing the effect of glycerol concentration and resuspension volume on depolymerization.

Main Results:

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  • Microtubule depolymerization correlated with a decrease in microtubule numbers, not size.
  • A subpopulation of microtubules became stable after approximately 20 minutes.
  • Depolymerization extent depended on resuspension volume and final glycerol concentration.

    • Conclusions:

    • Dilution triggers differential depolymerization, with some microtubules remaining stable.
    • Stabilizing factors, not tubulin dimers, likely prevent further depolymerization.
    • Colchicine addition did not alter depolymerization, suggesting tubulin dimers are not the stabilizing factor.