White matter integrity in mice requires continuous myelin synthesis at the inner tongue

A publication (journal article; original work) of the University of Göttingen

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​White matter integrity in mice requires continuous myelin synthesis at the inner tongue​
Meschkat, M.; Steyer, A. M.; Weil, M.-T.; Kusch, K.; Jahn, O.; Piepkorn, L. & Agüi-Gonzalez, P. et al.​ (2022) 
Nature Communications13(1) art. 1163​.​

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Attribution 4.0 CC BY 4.0

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Authors
Meschkat, Martin; Steyer, Anna M.; Weil, Marie-Theres; Kusch, Kathrin; Jahn, Olaf; Piepkorn, Lars; Agüi-Gonzalez, Paola; Phan, Nhu Thi Ngoc; Ruhwedel, Torben; Sadowski, Boguslawa; Möbius, Wiebke 
Abstract
Abstract Myelin, the electrically insulating sheath on axons, undergoes dynamic changes over time. However, it is composed of proteins with long lifetimes. This raises the question how such a stable structure is renewed. Here, we study the integrity of myelinated tracts after experimentally preventing the formation of new myelin in the CNS of adult mice, using an inducible Mbp null allele. Oligodendrocytes survive recombination, continue to express myelin genes, but they fail to maintain compacted myelin sheaths. Using 3D electron microscopy and mass spectrometry imaging we visualize myelin-like membranes failing to incorporate adaxonally, most prominently at juxta-paranodes. Myelinoid body formation indicates degradation of existing myelin at the abaxonal side and the inner tongue of the sheath. Thinning of compact myelin and shortening of internodes result in the loss of about 50% of myelin and axonal pathology within 20 weeks post recombination. In summary, our data suggest that functional axon-myelin units require the continuous incorporation of new myelin membranes.
Issue Date
2022
Journal
Nature Communications 
Working Group
RG Möbius 
RG Rizzoli (Quantitative Synaptology in Space and Time) 
eISSN
2041-1723
URL
https://mbexc.uni-goettingen.de/literature/publications/458
https://for2848.gwdguser.de/literature/publications/27

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