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A Quick Phenotypic Neurological Scoring System for Evaluating Disease Progression in the SOD1-G93A Mouse Model of ALS
Published on: October 6, 2015
Accumulation of human SOD1 and ubiquitinated deposits in the spinal cord of SOD1G93A mice during motor neuron disease
C Cheroni1, M Peviani, P Cascio
1Laboratory Molecular Neurobiology, Department of Neuroscience, Istituto di Ricerche Farmacologiche "Mario Negri", Via Eritrea, 62 20157 Milan, Italy.
Abstract:
Mutations in SOD1 cause selective motor neuron degeneration in familial amyotrophic lateral sclerosis patients and transgenic mice overexpressing the mutant enzyme. Formation and accumulation of ubiquitinated aggregates in motor neurons are thought to be involved in the toxic gain of function of mutant SOD1. The present study shows that the accumulation of soluble and detergent-insoluble mutant SOD1 in spinal cord of symptomatic SOD1G93A transgenic mice is due to impaired degradation of mutant SOD1 rather than to increased transcript levels. This effect was accompanied by a decrease of constitutive proteasome levels and a concomitant increase of immunoproteasome in the spinal cord homogenate which resulted in overall unchanged proteasome activity. A decrease of constitutive proteasome occurred in the motor neurons of SOD1G93A mice at the presymptomatic stage and became remarkable with the progression of the disease. This provides further evidence for an involvement of proteasome impairment in the toxicity of mutant SOD1.
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