Journal
NEUROBIOLOGY OF DISEASE
Volume 24, Issue 1, Pages 159-169Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.nbd.2006.06.006
Keywords
Schwann cell; CHN; peripheral neuropathy; Krox-20; proliferation; neuregulin; myelin; mutation; adenovirus
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Funding
- Wellcome Trust Funding Source: Medline
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Mutations in the DNA-binding domain of EGR2 are associated with severe autosomal dominant forms of peripheral neuropathy. In this study, we show that one such Egr2 mutant (S382R, D383Y), when expressed in Schwann cells in vitro, is not transcriptionally inactive but retains residual wild-type Egr2 functions, including inhibition of transforming growth factor-beta-induced Schwarm cell death and an ability to induce the cytoskeletal protein periaxin. More importantly, this mutant Egr2 has aberrant effects in Schwarm cells, enhancing DNA synthesis both in the presence and absence of the putative axonal mitogen, beta-neuregulin 1. This is in stark contrast to wild-type Egr2, which causes withdrawal from the cell cycle. Furthermore, mutant Egr2 upregulates cyclin D1 and reduces levels of the cell cycle inhibitor, p27. These observations add significant new evidence to explain how this mutation leads to congenital hyporayelinating neuropathy in humans. (c) 2006 Elsevier Inc. All rights reserved.
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