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Sci Transl Med. 2018 May 23;10(442). pii: eaal2563. doi: 10.1126/scitranslmed.aal2563.

Adult rat myelin enhances axonal outgrowth from neural stem cells.

Author information

1
Department of Neurosciences, University of California, San Diego, La Jolla, CA 92093, USA.
2
Departments of Psychiatry and Neurology, University of California, Los Angeles, Los Angeles, CA 90095, USA.
3
Veterans Administration Medical Center, San Diego, CA 92161, USA.
4
Department of Anesthesiology and Focus Program Translational Neurosciences, Medical Center of the Johannes Gutenberg-University, Mainz, Germany.
5
Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92093, USA.
6
Department of Neurosciences, University of California, San Diego, La Jolla, CA 92093, USA. mtuszynski@ucsd.edu.

Abstract

Axon regeneration after spinal cord injury (SCI) is attenuated by growth inhibitory molecules associated with myelin. We report that rat myelin stimulated the growth of axons emerging from rat neural progenitor cells (NPCs) transplanted into sites of SCI in adult rat recipients. When plated on a myelin substrate, neurite outgrowth from rat NPCs and from human induced pluripotent stem cell (iPSC)-derived neural stem cells (NSCs) was enhanced threefold. In vivo, rat NPCs and human iPSC-derived NSCs extended greater numbers of axons through adult central nervous system white matter than through gray matter and preferentially associated with rat host myelin. Mechanistic investigations excluded Nogo receptor signaling as a mediator of stem cell-derived axon growth in response to myelin. Transcriptomic screens of rodent NPCs identified the cell adhesion molecule neuronal growth regulator 1 (Negr1) as one mediator of permissive axon-myelin interactions. The stimulatory effect of myelin-associated proteins on rodent NPCs was developmentally regulated and involved direct activation of the extracellular signal-regulated kinase (ERK). The stimulatory effects of myelin on NPC/NSC axon outgrowth should be investigated further and could potentially be exploited for neural repair after SCI.

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