Erschienen in:
01.04.2007 | Original Paper
Mutant ubiquitin and p62 immunoreactivity in cases of combined multiple system atrophy and Alzheimer’s disease
verfasst von:
Beatrice Terni, María Jesús Rey, Susana Boluda, Benjamín Torrejón-Escribano, M. Pujol Sabate, Matil Calopa, Fred W. van Leeuwen, Isidro Ferrer
Erschienen in:
Acta Neuropathologica
|
Ausgabe 4/2007
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Abstract
Recent studies have shown the co-existence of α-synuclein and phosphorylated tau (pTau) in several neurodegenerative diseases. Here, we report two autopsy cases of combined multiple system atrophy (MSA) and Alzheimer’s disease (AD). In both cases, abundant α-synuclein-positive glial and neuronal cytoplasmic inclusions were found in the brainstem, amygdala and hippocampal formation. pTau-positive neurofibrillary tangles (NFTs) were widely distributed in case 1 (Braak stage VI) and moderate in case 2 (Braak stage III). Although α-synuclein and pTau pathology co-occurred in the hippocampus and entorhinal cortex, only a few neurons showed co-existence of these two proteins. Immunoreactivity for p62, a ubiquitin proteasome system related protein, was found in the majority of NFTs, but in only a small proportion of neuronal α-synuclein inclusions. In addition, UBB+1, a mutant form of ubiquitin and a marker for proteasomal dysfunction, was present in the majority of NFTs, whereas co-existence of α-synuclein and UBB+1 was found in only a few neurons. These findings indicate that α-synuclein and phosphorylated tau co-occur in certain brain regions in cases of combined MSA and AD and that the proteasomal pathways differ between α-synuclein- and pTau-bearing neurons.