Soluble neuregulin-1 has bifunctional, concentration-dependent effects on Schwann cell myelination

Neeraja Syed, Kavya Reddy, David P. Yang, Carla Taveggia, James L. Salzer, Patrice Maurel, Haesun A. Kim

Research output: Contribution to journalArticle

Abstract

Members of the neuregulin-1 (Nrg1) growth factor family play important roles during Schwann cell development. Recently, it has been shown that the membrane-bound type III isoform is required for Schwann cell myelination. Interestingly, however, Nrg1 type II, a soluble isoform, inhibits the process. The mechanisms underlying these isoform-specific effects are unknown. It is possible that myelination requires juxtacrine Nrg1 signaling provided by the membrane-bound isoform, whereas paracrine stimulation by soluble Nrg1 inhibits the process.Toinvestigate this,weasked whether Nrg1 type III provided in a paracrine manner would promote or inhibit myelination.We found that soluble Nrg1 type III enhanced myelination in Schwann cell-neuron cocultures. It improved myelination of Nrg1 type III+/- neurons and induced myelination on normally nonmyelinated sympathetic neurons. However, soluble Nrg1 type III failed to induce myelination on Nrg1 type III-/- neurons. To our surprise, low concentrations of Nrg1 type II also elicited a similar promyelinating effect. At high doses, however, both type II and III isoforms inhibited myelination and increased c-Jun expression in a manner dependent on Mek/Erk (mitogen-activated protein kinase kinase/extracellular signal-regulated kinase) activation. These results indicate that paracrine Nrg1 signaling provides concentration-dependent bifunctional effects on Schwann cell myelination. Furthermore, our studies suggest that theremaybe two distinct steps in Schwann cell myelination: an initial phase dependent on juxtacrine Nrg1 signaling and a later phase that can be promoted by paracrine stimulation.

Original languageEnglish
Pages (from-to)6122-6131
Number of pages10
JournalJournal of Neuroscience
Volume30
Issue number17
DOIs
Publication statusPublished - Apr 28 2010

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Neuregulin-1
Schwann Cells
Protein Isoforms
Neurons
Membranes
Mitogen-Activated Protein Kinase Kinases
Extracellular Signal-Regulated MAP Kinases
Coculture Techniques

ASJC Scopus subject areas

  • Neuroscience(all)

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Soluble neuregulin-1 has bifunctional, concentration-dependent effects on Schwann cell myelination. / Syed, Neeraja; Reddy, Kavya; Yang, David P.; Taveggia, Carla; Salzer, James L.; Maurel, Patrice; Kim, Haesun A.

In: Journal of Neuroscience, Vol. 30, No. 17, 28.04.2010, p. 6122-6131.

Research output: Contribution to journalArticle

Syed, Neeraja ; Reddy, Kavya ; Yang, David P. ; Taveggia, Carla ; Salzer, James L. ; Maurel, Patrice ; Kim, Haesun A. / Soluble neuregulin-1 has bifunctional, concentration-dependent effects on Schwann cell myelination. In: Journal of Neuroscience. 2010 ; Vol. 30, No. 17. pp. 6122-6131.
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