Aggregation of ubiquitin and a mutant ALS-linked SOD1 protein correlate with disease progression and fragmentation of the Golgi apparatus.

Abstract:

:Transgenic mice that express the G93A mutation of human Cu,Zn superoxide dismutase (SOD1(G93A)), found in familial amyotrophic lateral sclerosis (FALS), showed clinical symptoms and histopathological changes of sporadic ALS, including fragmentation of the neuronal Golgi apparatus (GA). The finding of fragmented neuronal GA in asymptomatic mice, months before the onset of paralysis, suggests that the GA is an early target of the pathological processes causing neuronal degeneration. Transgenic mice expressing human SOD1(G93A) have aggregates of mutant protein and ubiquitin in neuronal and glial cytoplasm; they appeared first in the neuropil and later in the perikarya of motor neurons, where they were adjacent to fragmented GA. The aggregates of SOD1(G93A) appeared in neuronal perikarya of asymptomatic mice containing fragmented GA. The numbers of neurons with deposits of SOD1(G93A) and fragmented GA progressively increased with age. Immuno-electron microscopy using colloidal gold showed labeling of ubiquitin and SOD1 over 13 nm thick cytoplasmic filaments. Spinal cord extracts showed a 20-fold increase of SOD1(G93A) in transgenic mice compared to the wild-type protein in controls. The results suggest a causal relationship between the aggregation of mutant SOD1 and ubiquitin, fragmentation of the Golgi apparatus of motor neurons and neurodegeneration.

journal_name

J Neurol Sci

authors

Stieber A,Gonatas JO,Gonatas NK

doi

10.1016/s0022-510x(99)00300-7

subject

Has Abstract

pub_date

2000-02-01 00:00:00

pages

53-62

issue

1

eissn

0022-510X

issn

1878-5883

pii

S0022-510X(99)00300-7

journal_volume

173

pub_type

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