Abstract:
:Myelin sheath thickness is precisely regulated and essential for rapid propagation of action potentials along myelinated axons. In the peripheral nervous system, extrinsic signals from the axonal protein neuregulin 1 (NRG1) type III regulate Schwann cell fate and myelination. Here we ask if modulating NRG1 type III levels in neurons would restore myelination in a model of congenital hypomyelinating neuropathy (CHN). Using a mouse model of CHN, we improved the myelination defects by early overexpression of NRG1 type III. Surprisingly, the improvement was independent from the upregulation of Egr2 or essential myelin genes. Rather, we observed the activation of MAPK/ERK and other myelin genes such as peripheral myelin protein 2 and oligodendrocyte myelin glycoprotein. We also confirmed that the permanent activation of MAPK/ERK in Schwann cells has detrimental effects on myelination. Our findings demonstrate that the modulation of axon-to-glial NRG1 type III signaling has beneficial effects and improves myelination defects during development in a model of CHN.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Belin S,Ornaghi F,Shackleford G,Wang J,Scapin C,Lopez-Anido C,Silvestri N,Robertson N,Williamson C,Ishii A,Taveggia C,Svaren J,Bansal R,Schwab MH,Nave K,Fratta P,D'Antonio M,Poitelon Y,Feltri ML,Wrabetz Ldoi
10.1093/hmg/ddy420subject
Has Abstractpub_date
2019-04-15 00:00:00pages
1260-1273issue
8eissn
0964-6906issn
1460-2083pii
5237695journal_volume
28pub_type
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