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Sci. Signal., 6 December 2011
Vol. 4, Issue 202, p. ra82
[DOI: 10.1126/scisignal.2002060]

RESEARCH ARTICLES

Neuronal Growth Cone Retraction Relies on Proneurotrophin Receptor Signaling Through Rac

Katrin Deinhardt1, Taeho Kim2*, Daniel S. Spellman3, Richard E. Mains4, Betty A. Eipper4, Thomas A. Neubert3, Moses V. Chao1, and Barbara L. Hempstead2{dagger}

1 Departments of Cell Biology, Physiology and Neuroscience, and Psychiatry and Center for Neural Science, Skirball Institute, New York University School of Medicine, 540 First Avenue, New York, NY 10016, USA.
2 Department of Medicine, Weill Cornell Medical College, 1300 York Avenue, New York, NY 10065, USA.
3 Department of Pharmacology and Skirball Institute, New York University School of Medicine, New York, NY 10016, USA.
4 Neuroscience Department, University of Connecticut Health Center, 263 Farmington Avenue, Farmington, CT 06030, USA.

* Present address: Bio-X and Department of Biology, Stanford University, Stanford, CA 94305, USA.

Abstract: Growth of axons and dendrites is a dynamic process that involves guidance molecules, adhesion proteins, and neurotrophic factors. Although neurite extension is stimulated by the neurotrophin nerve growth factor (NGF), we found that the precursor of NGF, proNGF, induced acute collapse of growth cones of cultured hippocampal neurons. This retraction was initiated by an interaction between the p75 neurotrophin receptor (p75NTR) and the sortilin family member SorCS2 (sortilin-related VPS10 domain–containing receptor 2). Binding of proNGF to the p75NTR-SorCS2 complex induced growth cone retraction by initiating the dissociation of the guanine nucleotide exchange factor Trio from the p75NTR-SorCS2 complex, resulting in decreased Rac activity and, consequently, growth cone collapse. The actin-bundling protein fascin was also inactivated, contributing to the destabilization and collapse of actin filaments. These results identify a bifunctional signaling mechanism by which proNGF regulates actin dynamics to acutely modulate neuronal morphology.

{dagger} To whom correspondence should be addressed. E-mail: blhempst{at}med.cornell.edu

Citation: K. Deinhardt, T. Kim, D. S. Spellman, R. E. Mains, B. A. Eipper, T. A. Neubert, M. V. Chao, B. L. Hempstead, Neuronal Growth Cone Retraction Relies on Proneurotrophin Receptor Signaling Through Rac. Sci. Signal. 4, ra82 (2011).

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