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Updated: Jul 22, 2026
10:23
High-resolution Imaging and Analysis of Individual Astral Microtubule Dynamics in Budding Yeast
Published on: April 20, 2017
[Microtubule dynamics in cultured cells].
I A Vorob'ev1, I S Grigor'ev, G G Borisy
1Moscow State University, Vorob'evy gory, Moscow, 119899 Russia.
Ontogenez
|January 12, 2001
Summary
Microtubule dynamics in cultured cells reveal differences in tubulin metabolism between epithelial and fibroblast cells. Fibroblast cells exhibit faster tubulin turnover, primarily through depolymerization, suggesting a conveyor mechanism for microtubule assembly.
Area of Science:
- Cell Biology
- Cytoskeleton Dynamics
- Microtubule Assembly
Background:
- Microtubules are crucial cytoskeletal components exhibiting dynamic instability.
- Understanding microtubule behavior in different cell types is key to cell function.
Purpose of the Study:
- To investigate microtubule dynamics in cultured epithelial (PtK1, Vero) and fibroblast (murine embryonic) cells.
- To compare microtubule end behavior and assembly/disassembly mechanisms.
Main Methods:
- Microinjection of fluorescent tubulin into cultured cells.
- Time-lapse video recording using a digital camcorder.
- Analysis of microtubule extension and shortening rates and distribution.
Main Results:
- Microtubule positive ends display dynamic instability, with varying equilibrium states across cell types.
- Free microtubules are more numerous and stable in epithelial cells than in fibroblasts.
- Negative ends are generally stable, but new ends formed from breakage depolymerize rapidly in fibroblasts.
Conclusions:
- Tubulin metabolism is higher in fibroblasts than in epithelial cells.
- Microtubule exchange in fibroblasts relies heavily on depolymerization of free negative ends, supporting the conveyor hypothesis.
- Dynamic instability alone is insufficient to explain long microtubule turnover.
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