Abstract
Although progression in multiple sclerosis is pathologically dominated by neurodegeneration, the underlying mechanism is unknown. Abnormal hyperphosphorylation of tau is implicated in the aetiopathogenesis of some common neurodegenerative disorders. We recently demonstrated the association of insoluble tau with established secondary progressive MS, raising the hypothesis that its accumulation is relevant to disease progression. In order to begin to determine the temporal emergence of abnormal tau with disease progression in MS, we examined tau phosphorylation in cerebral tissue from a rare case of early aggressive MS. We report tau hyperphosphorylation occurring in multiple cell types, with biochemical analysis confirming restriction to the soluble fraction. The absence of sarcosyl-insoluble tau fraction in early disease and its presence in secondary progression raises the possibility that insoluble tau accumulates with disease progression.
Abbreviations
- CNS:
-
Central nervous system
- LFB:
-
Luxol fast blue
- mAb:
-
Monoclonal antibody
- NGS:
-
Normal goat serum
- PB:
-
Phosphate buffer
- PBS:
-
Phosphate buffered saline
- TX-PBS:
-
Triton-phosphate buffered saline
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Acknowledgments
These studies were supported by the Webb Trust Fund, Husky Foundation, the Sir David Walker Trust Fund, the Medical Research Council, Wellcome Trust and MS Society of Great Britain and Northern Ireland and the National Multiple Sclerosis Society, USA. Tissue samples were supplied by the UK MS Tissue Bank, funded by the Multiple Sclerosis Society of Great Britain and Northern Ireland, registered charity 207495.
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J. M. Anderson and R. Patani are co-first authors.
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401_2009_515_MOESM1_ESM.tif
Immunohistochemical and histological characterisation of control fronto-parietal tissue with no known neuropathological disease. Normal myelin staining (LFB) of a white matter tract flanked by grey matter is shown. Inset demonstrates a representative high powered image of microglia immunolabelled with HLA-DR/LN-3, which sparsely populate healthy cerebral tissue. The resting ramified state shown is in contrast to the amoeboid morphology seen in active multiple sclerosis lesions (Fig 1c). Scale bars: main image:1mm; inset: 50μm. (TIFF 1504 kb)
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Anderson, J.M., Patani, R., Reynolds, R. et al. Evidence for abnormal tau phosphorylation in early aggressive multiple sclerosis. Acta Neuropathol 117, 583–589 (2009). https://doi.org/10.1007/s00401-009-0515-2
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DOI: https://doi.org/10.1007/s00401-009-0515-2