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Nat Neurosci. 2003 Nov;6(11):1186-93. Epub 2003 Oct 12.

Disruption of ErbB receptor signaling in adult non-myelinating Schwann cells causes progressive sensory loss.

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  • 1Division of Neuroscience, Children's Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, Massachusetts 02115, USA.

Abstract

Here we studied the role of signaling through ErbB-family receptors in interactions between unmyelinated axons and non-myelinating Schwann cells in adult nerves. We generated transgenic mice that postnatally express a dominant-negative ErbB receptor in non-myelinating but not in myelinating Schwann cells. These mutant mice present a progressive peripheral neuropathy characterized by extensive Schwann cell proliferation and death, loss of unmyelinated axons and marked heat and cold pain insensitivity. At later stages, C-fiber sensory neurons die by apoptosis, a process that may result from reduced GDNF (glial cell line-derived neurotrophic factor) expression in the sciatic nerve. Neuregulin 1 (NRG1)-ErbB signaling mediates, therefore, reciprocal interactions between non-myelinating Schwann cells and unmyelinated sensory neuron axons that are critical for Schwann cell and C-fiber sensory neuron survival. This study provides new insights into ErbB signaling in adult Schwann cells, the contribution of non-myelinating Schwann cells in maintaining trophic support of sensory neurons, and the possible role of disrupted ErbB signaling in peripheral sensory neuropathies.

PMID:
14555954
DOI:
10.1038/nn1139
[PubMed - indexed for MEDLINE]

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