Overexpression of manganese superoxide dismutase attenuates neuronal death in human cells expressing mutant (G37R) Cu/Zn-superoxide dismutase

Autor: Larry W. Oberley, Mark A. Ross, Richard D. Anderson, Shawn W. Flanagan
Rok vydání: 2002
Předmět:
Zdroj: Journal of Neurochemistry. 81:170-177
ISSN: 1471-4159
0022-3042
DOI: 10.1046/j.1471-4159.2002.00812.x
Popis: Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease characterized by loss of motor function and eventual death as a result of degeneration of motor neurons in the spinal cord and brain. The discovery of mutations in SOD1, the gene encoding the antioxidant enzyme Cu/Zn-superoxide dismutase (CuZnSOD), in a subset of ALS patients has led to new insight into the pathophysiology of ALS. Utilizing a novel adenovirus gene delivery system, our laboratory has developed a human cell culture model using chemically differentiated neuroblastoma cells to investigate how mutations in SOD1 lead to neuronal death. Expression of mutant SOD1 (G37R) resulted in a time and dose-related death of differentiated neuroblastoma cells. This cell death was inhibited by overexpression of the antioxidant enzyme manganese superoxide dismutase (MnSOD). These observations support the hypothesis that mutant SOD1-associated neuronal death is associated with alterations in oxidative stress, and since MnSOD is a mitochondrial enzyme, suggest that mitochondria play a key role in disease pathogenesis. Our findings in this model of inhibition of mutant SOD1-associated death by MnSOD represent an unique approach to explore the underlying mechanisms of mutant SOD1 cytotoxicity and can be used to identify potential therapeutic agents for further testing.
Databáze: OpenAIRE
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