Oligodendroglial deletion of ESCRT-I component TSG101 causes spongiform encephalopathy

Will P. Walker, Abby Oehler, Aimee L. Edinger, Kay Uwe Wagner, Teresa M. Gunn

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Background Information: Vacuolation of the central nervous system (CNS) is observed in patients with transmissible spongiform encephalopathy, HIV-related encephalopathy and some inherited diseases, but the underlying cellular mechanisms remain poorly understood. Mice lacking the mahogunin ring finger-1 (MGRN1) E3 ubiquitin ligase develop progressive, widespread spongiform degeneration of the CNS. MGRN1 ubiquitinates and regulates tumour susceptibility gene 101 (TSG101), a central component of the endosomal trafficking machinery. As loss of MGRN1 is predicted to cause partial TSG101 loss-of-function, we hypothesised that CNS vacuolation in Mgrn1 null mice may be caused by the accumulation of multi-cisternal endosome-like ‘class E’ vacuolar protein sorting (vps) compartments similar to those observed in Tsg101-depleted cells in culture. Results: To test this hypothesis, Tsg101 was deleted from mature oligodendroglia in vivo. This resulted in severe spongiform encephalopathy, histopathologically similar to that observed in Mgrn1 null mutant mice but with a more rapid onset. Vacuoles in the brains of Tsg101-deleted and Mgrn1 mutant mice labelled with endosomal markers, consistent with an endosomal origin. Vacuoles in the brains of mice inoculated with Rocky Mountain Laboratory (RML) prions did not label with these markers, indicating a different origin, consistent with previously published studies that indicate RML prions have a primary effect on neurons and cause vacuolation in an MGRN1-independent manner. Oligodendroglial deletion of Rab7, which mediates late endosome-to-lysosome trafficking and autophagosome–lysosome fusion, did not cause spongiform change. Conclusions: Our data suggest that the formation of multi-cisternal ‘class E’ vps endosomal structures in oligodendroglia leads to vacuolation. Significance: This work provides the first evidence that disrupting multi-vesicular body formation in oligodendroglia can cause white matter vacuolation and demyelination. HIV is known to hijack the endosomal sorting machinery, suggesting that HIV infection of the CNS may also act through this pathway to cause encephalopathy.

Original languageEnglish (US)
Pages (from-to)324-337
Number of pages14
JournalBiology of the Cell
Volume108
Issue number11
DOIs
StatePublished - Nov 1 2016

Fingerprint

Endosomal Sorting Complexes Required for Transport
Brain Diseases
Fingers
Oligodendroglia
Central Nervous System
Prions
Endosomes
Protein Transport
Vacuoles
AIDS Dementia Complex
Multivesicular Bodies
Prion Diseases
Ubiquitin-Protein Ligases
Brain
Demyelinating Diseases
Lysosomes
HIV Infections
Cell Culture Techniques
Tsg101 protein
HIV

Keywords

  • Endosomal sorting complex required for transport
  • Mahogunin ring finger-1
  • Spongiform neurodegeneration
  • Transmissible spongiform encephalopathy
  • Tumour susceptibility gene 101

ASJC Scopus subject areas

  • Cell Biology

Cite this

Walker, W. P., Oehler, A., Edinger, A. L., Wagner, K. U., & Gunn, T. M. (2016). Oligodendroglial deletion of ESCRT-I component TSG101 causes spongiform encephalopathy. Biology of the Cell, 108(11), 324-337. https://doi.org/10.1111/boc.201600014

Oligodendroglial deletion of ESCRT-I component TSG101 causes spongiform encephalopathy. / Walker, Will P.; Oehler, Abby; Edinger, Aimee L.; Wagner, Kay Uwe; Gunn, Teresa M.

In: Biology of the Cell, Vol. 108, No. 11, 01.11.2016, p. 324-337.

Research output: Contribution to journalArticle

Walker, WP, Oehler, A, Edinger, AL, Wagner, KU & Gunn, TM 2016, 'Oligodendroglial deletion of ESCRT-I component TSG101 causes spongiform encephalopathy', Biology of the Cell, vol. 108, no. 11, pp. 324-337. https://doi.org/10.1111/boc.201600014
Walker, Will P. ; Oehler, Abby ; Edinger, Aimee L. ; Wagner, Kay Uwe ; Gunn, Teresa M. / Oligodendroglial deletion of ESCRT-I component TSG101 causes spongiform encephalopathy. In: Biology of the Cell. 2016 ; Vol. 108, No. 11. pp. 324-337.
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