Neuron to glia signaling triggers myelin membrane exocytosis from endosomal storage sites

Katarina Trajkovic, Ajit Singh Dhaunchak, José T. Goncalves, Dirk Wenzel, Anja Schneider, Gertrude Bunt, Klaus Armin Nave, Mikael Simons

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121 Scopus citations


During vertebrate brain development, axons are enwrapped by myelin, an insulating membrane produced by oligodendrocytes. Neuron-derived signaling molecules are temporally and spatially required to coordinate oligodendrocyte differentiation. In this study, we show that neurons regulate myelin membrane traf. cking in oligodendrocytes. In the absence of neurons, the major myelin membrane protein, the proteolipid protein (PLP), is internalized and stored in late endosomes/lysosomes (LEs/Ls) by a cholesterol-dependent and clathrinindependent endocytosis pathway that requires actin and the RhoA guanosine triphosphatase. Upon maturation, the rate of endocytosis is reduced, and a cAMP-dependent neuronal signal triggers the transport of PLP from LEs/Ls to the plasma membrane. These . ndings reveal a fundamental and novel role of LEs/Ls in oligodendrocytes: to store and release PLP in a regulated fashion. The release of myelin membrane from LEs/Ls by neuronal signals may represent a mechanism to control myelin membrane growth.

Original languageEnglish (US)
Pages (from-to)937-948
Number of pages12
JournalJournal of Cell Biology
Issue number6
Publication statusPublished - Mar 13 2006


ASJC Scopus subject areas

  • Cell Biology

Cite this

Trajkovic, K., Dhaunchak, A. S., Goncalves, J. T., Wenzel, D., Schneider, A., Bunt, G., ... Simons, M. (2006). Neuron to glia signaling triggers myelin membrane exocytosis from endosomal storage sites. Journal of Cell Biology, 172(6), 937-948.