Rho GTPases regulate axon growth through convergent and divergent signaling pathways.

Abstract:

:Rho GTPases are essential regulators of cytoskeletal reorganization, but how they do so during neuronal morphogenesis in vivo is poorly understood. Here we show that the actin depolymerization factor cofilin is essential for axon growth in Drosophila neurons. Cofilin function in axon growth is inhibited by LIM kinase and activated by Slingshot phosphatase. Dephosphorylating cofilin appears to be the major function of Slingshot in regulating axon growth in vivo. Genetic data provide evidence that Rho or Rac/Cdc42, via effector kinases Rok or Pak, respectively, activate LIM kinase to inhibit axon growth. Importantly, Rac also activates a Pak-independent pathway that promotes axon growth, and different RacGEFs regulate these distinct pathways. These genetic analyses reveal convergent and divergent pathways from Rho GTPases to the cytoskeleton during axon growth in vivo and suggest that different developmental outcomes could be achieved by biases in pathway selection.

journal_name

Neuron

journal_title

Neuron

authors

Ng J,Luo L

doi

10.1016/j.neuron.2004.11.014

subject

Has Abstract

pub_date

2004-12-02 00:00:00

pages

779-93

issue

5

eissn

0896-6273

issn

1097-4199

pii

S0896627304007524

journal_volume

44

pub_type

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