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Measuring Retrograde Actin Flow in Neuronal Growth Cones
Laura Pulido Cifuentes1, Daniel M Suter2,3,4,5,6,7
1Department of Biological Sciences, Purdue University, West Lafayette, IN, USA.
Methods in Molecular Biology (Clifton, N.J.)
|August 12, 2024
Summary
Quantifying retrograde actin flow in neuronal growth cones is crucial for understanding cell locomotion. This study presents three methods to measure this F-actin movement in Aplysia neurons.
Area of Science:
- Cell Biology
- Neuroscience
- Cytoskeletal Dynamics
Background:
- Actin flow, the movement of the F-actin cytoskeleton, is vital for cell locomotion, particularly in motile cells like neuronal growth cones.
- This flow is typically retrograde, moving from the cell periphery towards the center.
- Substrate-cytoskeletal coupling allows actin flow to drive forward cell movement.
Purpose of the Study:
- To present and illustrate three distinct methods for quantifying retrograde F-actin flow.
- To apply these methods to F-actin flow in growth cones of cultured Aplysia bag cell neurons.
Main Methods:
- Tracking the movement of surface marker beads.
- Kymograph analysis of time-lapse sequences using differential interference contrast (DIC) imaging.
- Kymograph analysis of time-lapse sequences using fluorescent speckle microscopy (FSM).
Main Results:
- Demonstrated successful quantification of retrograde F-actin flow using the described methods.
- Highlighted the suitability of Aplysia neuronal growth cones for these techniques due to their size.
Conclusions:
- The presented methods provide robust ways to measure retrograde F-actin flow in neuronal growth cones.
- These techniques are adaptable for use in other growth cone systems with distinct F-actin-rich peripheral domains.
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