Vimentin regulates peripheral nerve myelination.
Development
; 139(7): 1359-67, 2012 Apr.
Article
em En
| MEDLINE
| ID: mdl-22357929
ABSTRACT
Myelination is a complex process that requires coordinated Schwann cell-axon interactions during development and regeneration. Positive and negative regulators of myelination have been recently described, and can belong either to Schwann cells or neurons. Vimentin is a fibrous component present in both Schwann cell and neuron cytoskeleton, the expression of which is timely and spatially regulated during development and regeneration. We now report that vimentin negatively regulates myelination, as loss of vimentin results in peripheral nerve hypermyelination, owing to increased myelin thickness in vivo, in transgenic mice and in vitro in a myelinating co-culture system. We also show that this is due to a neuron-autonomous increase in the levels of axonal neuregulin 1 (NRG1) type III. Accordingly, genetic reduction of NRG1 type III in vimentin-null mice rescues hypermyelination. Finally, we demonstrate that vimentin acts synergistically with TACE, a negative regulator of NRG1 type III activity, as shown by hypermyelination of double Vim/Tace heterozygous mice. Our results reveal a novel role for the intermediate filament vimentin in myelination, and indicate vimentin as a regulator of NRG1 type III function.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Nervos Periféricos
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Vimentina
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Regulação da Expressão Gênica no Desenvolvimento
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Bainha de Mielina
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Development
Assunto da revista:
BIOLOGIA
/
EMBRIOLOGIA
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Itália