Cited by 46Peripheral Neuropathies and DisordersMultiple Sclerosis Research StudiesAutophagy in Disease and Therapy

Schwann cell dedifferentiation-associated demyelination leads to exocytotic myelin clearance in inflammatory segmental demyelination

Jang, So Young, Yoon, Byeol-A, Shin, Yoon Kyung, Yun, Seoug Hoon, Jo, Young Rae, Choi, Yun Young, Ahn, Meejung, Shin, Taekyun +3 more·2017·Glia

Abstract

Schwann cells (SCs), which form the peripheral myelin sheath, have the unique ability to dedifferentiate and to destroy the myelin sheath under various demyelination conditions. During SC dedifferentiation-associated demyelination (SAD) in Wallerian degeneration (WD) after axonal injury, SCs exhibit myelin and junctional instability, down-regulation of myelin gene expression and autophagic myelin breakdown. However, in inflammatory demyelinating neuropathy (IDN), it is still unclear how SCs react and contribute to segmental demyelination before myelin scavengers, macrophages, are activated for phagocytotic myelin digestion. Here, we compared the initial SC demyelination mechanism of IDN to that of WD using microarray and histochemical analyses and found that SCs in IDN exhibited several typical characteristics of SAD, including actin-associated E-cadherin destruction, without obvious axonal degeneration. However, autophagolysosome activation in SAD did not appear to be involved in direct myelin lipid digestion by SCs but was required for the separation of SC body from destabilized myelin sheath in IDN. Thus, lysosome inhibition in SCs suppressed segmental demyelination by preventing the exocytotic myelin clearance of SCs. In addition, we found that myelin rejection, which might also require the separation of SC cytoplasm from destabilized myelin sheath, was delayed in SC-specific Atg7 knockout mice in WD, suggesting that autophagolysosome-dependent exocytotic myelin clearance by SCs in IDN and WD is a shared mechanism. Finally, autophagolysosome activation in SAD was mechanistically dissociated with the junctional destruction in both IDN and WD. Thus, our findings indicate that SAD could be a common myelin clearance mechanism of SCs in various demyelinating conditions.

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Crossref · 10.1002/glia.23200

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Authors
Jang, S. Y., Yoon, B.-A., Shin, Y. K., Yun, S. H., Jo, Y. R., Choi, Y. Y., Ahn, M., Shin, T., Park, J. I., Kim, J. K., & Park, H. T.
Affiliations
  • Dong-A University (KR)
  • Jeju National University (KR)
Corresponding author
Park, Hwan Tae
Venue
Glia
Publisher
Wiley
Published
2017-08-10
Volume
65
Issue
11
Pages
1848-1862
ISSN
0894-1491 (ISSN-L)
OpenAlex
W2744795364
Cited by
46
References
66
Citations by year
2026: 5 · 2025: 4 · 2024: 4 · 2023: 7 · 2022: 3 · 2021: 6 · 2020: 3 · 2019: 9 · 2018: 5
FWCI
3.24
Type
journal article
Language
en
Open access
closed
Locations
  • Glia (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Research Foundation of Korea (2014R1A2A2A01002566, 2016R1A5A2007009)
  • Korean Health Technology R&D Project, Ministry of Health & Welfare (HI14C18070000)
Topics
  • Health Sciences › Medicine › Neurology › Peripheral Neuropathies and Disorders
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Multiple Sclerosis Research Studies
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
Schwann cell dedifferentiation, segmental demyelination, inflammatory demyelinating neuropathy, Wallerian degeneration, autophagolysosomes, ATG7, E-cadherin
MeSH terms
Autophagy-Related Protein 7, Animals, Chloroquine, Demyelinating Diseases, Disease Models, Animal, Female, Male, Mice, Inbred C57BL, Mice, Transgenic, Myelin Proteins, Nerve Tissue Proteins, Neuritis, Autoimmune, Experimental, Rats, Inbred Lew, Schwann Cells, Down-Regulation, Axotomy, Sciatic Neuropathy, Mice, Rats, Cell Dedifferentiation, Receptors, Urokinase Plasminogen Activator

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