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Galin V. Michailov,1*Michael W. Sereda,1,2*Bastian G. Brinkmann,1Tobias M. Fischer,4Bernhard Haug,3Carmen Birchmeier,5Lorna Role,6Cary Lai,4Markus H. Schwab,1Klaus-Armin Nave1,7
In the nervous system of vertebrates, myelination is essentialfor rapid and accurate impulse conduction. Myelin thicknessdepends on axon fiber size. We use mutant and transgenic mouselines to show that axonal Neuregulin-1 (Nrg1) signals informationabout axon size to Schwann cells. Reduced Nrg1 expression causeshypomyelination and reduced nerve conduction velocity. Neuronaloverexpression of Nrg1 induces hypermyelination and demonstratesthat Nrg1 type III is the responsible isoform. We suggest amodel by which myelin-forming Schwann cells integrate axonalNrg1 signals as a biochemical measure of axon size.
1 Department of Neurogenetics, Max Planck Institute of Experimental Medicine, 37075 Göttingen, Germany. 2 Department of Neurology, University of Göttingen, 37075 Göttingen, Germany. 3 Department of Clinical Neurophysiology, University of Göttingen, 37075 Göttingen, Germany. 4 Department of Neuropharmacology, Scripps Research Institute, La Jolla, CA 92037, USA. 5 Max Delbrueck Center for Molecular Medicine, 13125 Berlin, Germany. 6 Columbia University, New York, NY 10032, USA. 7 Hertie Institute of Multiple Sclerosis Research, 37075 Göttingen, Germany.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: nave{at}em.mpg.de
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