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The Journal of Neuroscience, June 15, 2001, 21(12):4281-4289

Diversity and Specificity of Actions of Slit2 Proteolytic Fragments in Axon Guidance

Kim T. Nguyen Ba-Charvet¹, Katja Brose², Le Ma², Kuan H. Wang², Valérie Marillat¹, Constantino Sotelo¹, Marc Tessier-Lavigne², and Alain Chédotal¹

¹ Institut National de la Santé et de la Recherche Médicale U106, Bâtiment de Pédiatrie, Hôpital de la Salpêtrière, 75013 Paris, France, and ² Howard Hughes Medical Institute, Department of Anatomy and Department of Biochemistry and Biophysics, University of California, San Francisco, California 94143-0452

The Slits are secreted proteins that bind to Robo receptors and play a role in axon guidance and neuronal migration. In vertebrates, Slit2 is a major chemorepellent for developing axons and is involved in the control of midline crossing. In vivo, Slit2 is cleaved into 140 kDa N-terminal (Slit2-N) and 55-60 kDa C-terminal (Slit2-C) fragments, although the uncleaved/full-length form can also be isolated from brain extract. We explored the functional activities of Slit2 fragments by engineering mutant and truncated versions of Slit2 representing the N-, C-, and full/uncleavable (Slit2-U) fragments. Only Slit2-N and Slit2-U bind the Robo proteins. We found that in collagen gel, olfactory bulb (OB) but not dorsal root ganglia (DRG) axons are repelled by Slit2-N and Slit2-U. Moreover, only Slit2-N membranes or purified protein-induced OB growth cones collapse. Finally, we found that only recombinant Slit2-N could induce branching of DRG axons and that this effect was antagonized by Slit2-U. Therefore, different axons have distinct responses to Slit2 fragments, and these proteins have different growth-promoting capacities.

Key words: repulsion; guidance; collapse; Robo; Slit2; branching

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Copyright © 2001 Society for Neuroscience  0270-6474/01/21124281-09$05.00/0

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