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Molecular and Cellular Biology, November 2005, p. 9920-9935, Vol. 25, No. 22
0270-7306/05/$08.00+0     doi:10.1128/MCB.25.22.9920-9935.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

CRMP-2 Is Involved in Kinesin-1-Dependent Transport of the Sra-1/WAVE1 Complex and Axon Formation{dagger}

Yoji Kawano,1,2 Takeshi Yoshimura,1 Daisuke Tsuboi,1 Saeko Kawabata,1 Takako Kaneko-Kawano,2 Hiromichi Shirataki,2 Tadaomi Takenawa,3 and Kozo Kaibuchi1*

Department of Cell Pharmacology, Graduate School of Medicine, Nagoya University, 65 Tsurumai, Showa-ku, Nagoya, Aichi 466-8550,1 Division of Molecular and Cell Biology, Institute for Medical Science, Dokkyo University School of Medicine, 880 Kitakobayashi, Mibu-machi, Tochigi 321-0293,2 Department of Biochemistry, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108, Japan3

Received 22 January 2005/ Returned for modification 5 April 2005/ Accepted 6 September 2005

A neuron has two types of highly polarized cell processes, the single axon and multiple dendrites. One of the fundamental questions of neurobiology is how neurons acquire such specific and polarized morphologies. During neuronal development, various actin-binding proteins regulate dynamics of actin cytoskeleton in the growth cones of developing axons. The regulation of actin cytoskeleton in the growth cones is thought to be involved in axon outgrowth and axon-dendrite specification. However, it is largely unknown which actin-binding proteins are involved in axon-dendrite specification and how they are transported into the developing axons. We have previously reported that collapsin response mediator protein 2 (CRMP-2) plays a critical role in axon outgrowth and axon-dendrite specification (N. Inagaki, K. Chihara, N. Arimura, C. Menager, Y. Kawano, N. Matsuo, T. Nishimura, M. Amano, and K. Kaibuchi, Nat. Neurosci. 4:781-782, 2001). Here, we found that CRMP-2 interacted with the specifically Rac1-associated protein 1 (Sra-1)/WASP family verprolin-homologous protein 1 (WAVE1) complex, which is a regulator of actin cytoskeleton. The knockdown of Sra-1 and WAVE1 by RNA interference canceled CRMP-2-induced axon outgrowth and multiple-axon formation in cultured hippocampal neurons. We also found that CRMP-2 interacted with the light chain of kinesin-1 and linked kinesin-1 to the Sra-1/WAVE1 complex. The knockdown of CRMP-2 and kinesin-1 delocalized Sra-1 and WAVE1 from the growth cones of axons. These results suggest that CRMP-2 transports the Sra-1/WAVE1 complex to axons in a kinesin-1-dependent manner and thereby regulates axon outgrowth and formation.

* Corresponding author. Mailing address: Department of Cell Pharmacology, Graduate School of Medicine, Nagoya University, 65 Tsurumai, Showa-ku, Nagoya, Aichi 466-8550, Japan. Phone: 81-52-744-2074. Fax: 81-52-744-2083. E-mail: kaibuchi{at}med.nagoya-u.ac.jp.

{dagger} Supplemental material for this article may be found at http://mcb.asm.org/.

Molecular and Cellular Biology, November 2005, p. 9920-9935, Vol. 25, No. 22
0022-538X/05/$08.00+0     doi:10.1128/MCB.25.22.9920-9935.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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