Cited by 212Neurogenesis and neuroplasticity mechanismsMultiple Sclerosis Research StudiesProtein Kinase Regulation and GTPase Signaling

Myelin-mediated inhibition of oligodendrocyte precursor differentiation can be overcome by pharmacological modulation of Fyn-RhoA and protein kinase C signalling

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Baer, Alexandra S., Syed, Yasir A., Kang, Sung Ung, Mitteregger, Dieter, Vig, Raluca, ffrench-Constant, Charles, Franklin, Robin J. M., Altmann, Friedrich +2 more·2009·Brain

Abstract

Failure of oligodendrocyte precursor cell (OPC) differentiation contributes significantly to failed myelin sheath regeneration (remyelination) in chronic demyelinating diseases. Although the reasons for this failure are not completely understood, several lines of evidence point to factors present following demyelination that specifically inhibit differentiation of cells capable of generating remyelinating oligodendrocytes. We have previously demonstrated that myelin debris generated by demyelination inhibits remyelination by inhibiting OPC differentiation and that the inhibitory effects are associated with myelin proteins. In the present study, we narrow down the spectrum of potential protein candidates by proteomic analysis of inhibitory protein fractions prepared by CM and HighQ column chromatography followed by BN/SDS/SDS-PAGE gel separation using Nano-HPLC-ESI-Q-TOF mass spectrometry. We show that the inhibitory effects on OPC differentiation mediated by myelin are regulated by Fyn-RhoA-ROCK signalling as well as by modulation of protein kinase C (PKC) signalling. We demonstrate that pharmacological or siRNA-mediated inhibition of RhoA-ROCK-II and/or PKC signalling can induce OPC differentiation in the presence of myelin. Our results, which provide a mechanistic link between myelin, a mediator of OPC differentiation inhibition associated with demyelinating pathologies and specific signalling pathways amenable to pharmacological manipulation, are therefore of significant potential value for future strategies aimed at enhancing CNS remyelination.

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  • Inhibition of PKCα only shows effects in the presence of inhibitory myelin substrates.

    “This was expected as with the culture conditions applied, inhibition of PKCα only shows effects in the presence of inhibitory myelin substrates22.”

    From Tamoxifen accelerates the repair of demyelinated lesions in the central nervous system (2016) · cites this paper as [22]

    The Results section, “PKC inhibitors promote OPC differentiation in the presence of myelin inhibitors” (page unavailable), reports that PKC inhibitors and PKC-α silencing increased OPC differentiation on myelin substrates. It does not establish the claim’s “only” qualifier: that PKC-α inhibition has no effect without an inhibitory myelin substrate. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • In the presence of myelin debris, inhibition of PKCα neutralizes myelin-associated inhibitors and promotes differentiation.

    “Conversely, in the presence of myelin debris, the inhibition of PKCα neutralizes myelin-associated inhibitors and promotes differentiation22.”
  • One critical role for microglia during demyelination is the clearance of myelin debris, which acts as an inhibitor of remyelination.

    “One critical role for microglia during demyelination is the clearance of myelin debris, which acts as an inhibitor of remyelination [192–194].”
  • Inhibition of PKCs does not promote differentiation by itself when cells are cultured in serum-containing media.

    “Our results also confirm previous reports22 that the inhibition of PKCs does not promote differentiation by itself when cells are cultured in serum containing media.”

    From Tamoxifen accelerates the repair of demyelinated lesions in the central nervous system (2016) · cites this paper as [22]

    The Results section reports that PKC inhibitors promoted oligodendrocyte precursor differentiation in the presence of myelin inhibitors. It does not report whether PKC inhibition alone promotes differentiation in serum-containing medium; searches for serum and for treatment on a control substrate did not establish that comparison. Page numbers were not available in our copy. (LLM, conf=0.76)

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Authors
Baer, A. S., Syed, Y. A., Kang, S. U., Mitteregger, D., Vig, R., ffrench-Constant, C., Franklin, R. J. M., Altmann, F., Lubec, G., & Kotter, M. R.
Affiliations
  • Medical University of Vienna (AT)
  • University of Cambridge (GB)
Corresponding author
Kotter, Mark R.
Venue
Brain
Published
2009-02
Volume
132
Issue
2
Pages
465-481
ISSN
  • 0006-8950 (ISSN-L)
  • 1460-2156
OpenAlex
W2159729185
Cited by
211
References
91
Citations by year
2026: 6 · 2025: 13 · 2024: 13 · 2023: 12 · 2022: 16 · 2021: 12 · 2020: 5 · 2019: 8 · 2018: 10 · 2017: 12 · 2016: 14 · 2015: 14 · 2014: 8 · 2013: 19 · 2012: 13
FWCI
5.13
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Brain (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • ORCA Online Research @Cardiff (Cardiff University) (acceptedVersion)
  • Edinburgh Research Explorer (University of Edinburgh) (submittedVersion, other-oa)
  • MPG.PuRe (Max Planck Society) (submittedVersion, other-oa)
  • Max Planck Institute for Plasma Physics (submittedVersion)
  • GRO (submittedVersion)
  • UEA Digital Repository (University of East Anglia) (submittedVersion)
Funders
Austrian Science Fund
Topics
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Multiple Sclerosis Research Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
myelin, remyelination, demyelinating disease, myelin debris, proteomics, siRNA knockdown, pharmacological modulation, myelin proteins
MeSH terms
Animals, Animals, Newborn, Carbazoles, Cell Differentiation, Demyelinating Diseases, Electrophoresis, Polyacrylamide Gel, Indoles, Maleimides, Myelin Sheath, Nerve Regeneration, Oligodendroglia, Stem Cells, Signal Transduction, Rats, Sprague-Dawley, 1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine, rhoA GTP-Binding Protein, RNA, Small Interfering, Proto-Oncogene Proteins c-fyn, Rats, Protein Kinase C-alpha, rho-Associated Kinases

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