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J. Cell Biol. 161 (6): 1133-1141

Copyright © 2003 by the Rockefeller University Press.


Article

Back signaling by the Nrg-1 intracellular domain

Jianxin Bao1,3, Deon Wolpowitz3, Lorna W. Role1,3, and David A. Talmage2,4

1 Department of Anatomy and Cell Biology, Columbia University, New York, NY 10032
2 Department of Pediatrics, Columbia University, New York, NY 10032
3 Center for Neurobiology and Behavior, Columbia University, New York, NY 10032
4 Institute of Human Nutrition, Columbia University, New York, NY 10032

Address correspondence to David A. Talmage, Institute of Human Nutrition, 701 West 168th St., 5-503 New York, NY 10032. Tel.: (212) 305-2107. Fax: (212) 305-3079. E-mail: dat1{at}columbia.edu

Abstract: Transmembrane isoforms of neuregulin-1 (Nrg-1), ligands for erbB receptors, include an extracellular domain with an EGF-like sequence and a highly conserved intracellular domain (ICD) of unknown function. In this paper, we demonstrate that transmembrane isoforms of Nrg-1 are bidirectional signaling molecules in neurons. The stimuli for Nrg-1 back signaling include binding of erbB receptor dimers to the extracellular domain of Nrg-1 and neuronal depolarization. These stimuli elicit proteolytic release and translocation of the ICD of Nrg-1 to the nucleus. Once in the nucleus, the Nrg-1 ICD represses expression of several regulators of apoptosis, resulting in decreased neuronal cell death in vitro. Thus, regulated proteolytic processing of Nrg-1 results in retrograde signaling that appears to mediate contact and activity-dependent survival of Nrg-1–expressing neurons.

Key Words: erbB receptors; apoptosis; {gamma}-secretase; synaptic maintenance; neurodegeneration


* Abbreviations used in this paper: CRD, cysteine-rich domain; ECD, extracellular domain; ICD, intracellular domain; LIMK1, LIM kinase 1; Nrg-1, neuregulin-1.

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