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Updated: Jul 3, 2026

Analyses of Actin Dynamics, Clutch Coupling and Traction Force for Growth Cone Advance
Published on: October 21, 2021
ERM proteins regulate growth cone responses to Sema3A.
C David Mintz1, Ioana Carcea, Daniel G McNickle
1Fishberg Department of Neuroscience, Mount Sinai School of Medicine, New York, NY 10029, USA.
Ezrin, radixin, and moesin (ERMs) coordinate axonal growth cone responses to Semaphorin 3A (Sema3A) guidance cues. These proteins regulate receptor internalization and actin dynamics, crucial for growth cone collapse and directed growth.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Axonal growth cones navigate complex environments using guidance cues.
- Coordinated cellular events like receptor dynamics and actin remodeling are vital for growth cone guidance.
- Mechanisms coordinating these disparate cellular actions remain poorly understood.
Purpose of the Study:
- To investigate the role of ezrin, radixin, and moesin (ERMs) in coordinating growth cone responses to Semaphorin 3A (Sema3A).
- To elucidate how ERMs mediate Sema3A-induced growth cone collapse and guidance.
Main Methods:
- Assessed ERM protein localization and activation in neocortical growth cones.
- Investigated the effect of Sema3A on ERM activity.
- Utilized biochemical assays to determine ERM domain functions in receptor internalization and actin binding.
Main Results:
- Active ERMs exhibit asymmetric localization in growth cones and are rapidly inactivated by Sema3A.
- ERMs are essential for Sema3A-mediated growth cone collapse and guidance.
- The FERM domain of ERMs regulates Npn1 and L1CAM internalization, while the C-terminal domain caps F-actin.
Conclusions:
- ERM proteins act as key coordinators of growth cone responses to Sema3A.
- ERMs integrate membrane and actin dynamics to mediate guidance cue signaling.
- This study provides a novel model for ERM function in neuronal development.
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