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The cytoskeleton of neurites after microtubule depolymerization.
Experimental Cell Research
|March 1, 1986
Summary
Cold-stable microtubule fragments in axons act as seeds for microtubule assembly. This study directly investigates these cold-stable microtubule structures in neuronal cells.
Area of Science:
- Cell Biology
- Neuroscience
- Cytoskeleton Dynamics
Background:
- Microtubules (MTs) in axons exhibit cold-stable fragments that may organize assembly.
- Previous work suggested a correlation between cold-stable MTs and polarity re-establishment after rewarming.
Purpose of the Study:
- To directly investigate the form of cold-stable microtubules (MTs) in neuronal processes.
- To provide direct evidence supporting the hypothesis that cold-stable MT fragments act as nucleation sites for axonal MT assembly.
Main Methods:
- Two-dimensional reconstruction of serial thin sections of PC-12 cell neurites.
- Ultrastructural observation of detergent-lysed, whole-mounted neuroblastoma (Neuro 2A) cells.
Main Results:
- Cold treatment significantly reduced average microtubule length while increasing microtubule number in neurites.
- Cold-stable microtubule fragments were observed, supporting their role as assembly seeds.
- Microtubule depolymerization led to increased membranous elements and cytoskeletal splaying, with filopodia formation.
Conclusions:
- Cold-stable microtubule fragments serve as critical nucleation sites for microtubule organization in axons.
- The regulation of cytoskeletal ends, influenced by microtubule dynamics, plays a role in cell surface motility and filopodia formation.