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Published on: October 3, 2012
Histotype-Dependent Oligodendroglial PrP Pathology in Sporadic CJD: A Frequent Feature of the M2C "Strain"
Ellen Gelpi1,2, Sigrid Klotz1,2, Nuria Vidal-Robau3
1Division of Neuropathology and Neurochemistry, Department of Neurology, Medical University of Vienna, 1090 Vienna, Austria.
Abstract:
In sporadic Creutzfeldt-Jakob disease, molecular subtypes are neuropathologically well identified by the lesioning profile and the immunohistochemical PrPd deposition pattern in the grey matter (histotypes). While astrocytic PrP pathology has been reported in variant CJD and some less frequent histotypes (e.g., MV2K), oligodendroglial pathology has been rarely addressed. We assessed a series of sCJD cases with the aim to identify particular histotypes that could be more prone to harbor oligodendroglial PrPd. Particularly, the MM2C phenotype, in both its more "pure" and its mixed MM1+2C or MV2K+2C forms, showed more frequent oligodendroglial PrP pathology in the underlying white matter than the more common MM1/MV1 and VV2 histotypes, and was more abundant in patients with a longer disease duration. We concluded that the MM2C strain was particularly prone to accumulate PrPd in white matter oligodendrocytes.
Insights
The MM2C subtype of sporadic Creutzfeldt-Jakob disease (sCJD) shows a higher prevalence of PrP-d accumulation in white matter oligodendrocytes compared to other sCJD subtypes. This finding suggests the MM2C strain is particularly prone to affecting white matter oligodendroglia.
Area of Science:
- Neuroscience
- Neuropathology
- Prion Diseases
Background:
- Sporadic Creutzfeldt-Jakob disease (sCJD) classification relies on lesion profiles and PrP-d deposition patterns.
- Oligodendroglial PrP-d pathology in sCJD is infrequently studied, unlike astrocytic involvement.
Purpose of the Study:
- To identify specific sCJD histotypes prone to oligodendroglial PrP-d accumulation.
- To investigate the relationship between sCJD subtypes, disease duration, and white matter pathology.
Main Methods:
- Analysis of a series of sCJD cases.
- Neuropathological assessment of lesioning profiles and PrP-d deposition.
- Immunohistochemical evaluation of PrP-d in grey and white matter, focusing on oligodendroglia.
Main Results:
- The MM2C phenotype (pure and mixed forms) exhibited more frequent oligodendroglial PrP-d pathology in white matter.
- This pathology was more prevalent in MM2C cases compared to MM1/MV1 and VV2 histotypes.
- Oligodendroglial PrP-d burden correlated positively with longer disease duration.
Conclusions:
- The MM2C prion strain demonstrates a particular propensity for accumulating PrP-d in white matter oligodendrocytes.
- This highlights MM2C as a distinct histotype with specific neuropathological characteristics in sCJD.
