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J. Biol. Chem., Vol. 277, Issue 33, 29626-29633, August 16, 2002
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From the Department of Neurology and Neuroscience, Weill Medical
College of Cornell University, New York, New York 10021
A growing body of evidence suggests that impaired
mitochondrial energy production and increased oxidative radical damage
to the mitochondria could be causally involved in motor neuron death in
amyotrophic lateral sclerosis (ALS) and in familial ALS associated with
mutations of Cu,Zn superoxide dismutase (SOD1). For example, morphologically abnormal mitochondria and impaired mitochondrial histoenzymatic respiratory chain activities have been described in
motor neurons of patients with sporadic ALS. To investigate further the
role of mitochondrial alterations in the pathogenesis of ALS, we
studied mitochondria from transgenic mice expressing wild type and G93A
mutated hSOD1. We found that a significant proportion of enzymatically
active SOD1 was localized in the intermembrane space of mitochondria.
Mitochondrial respiration, electron transfer chain, and ATP synthesis
were severely defective in G93A mice at the time of onset of the
disease. We also found evidence of oxidative damage to mitochondrial
proteins and lipids. On the other hand, presymptomatic G93A transgenic
mice and mice expressing the wild type form of hSOD1 did not show
significant mitochondrial abnormalities. Our findings suggest that
G93A-mutated hSOD1 in mitochondria may cause mitochondrial defects,
which contribute to precipitating the neurodegenerative process in
motor neurons.
Mutated Human SOD1 Causes Dysfunction of Oxidative
Phosphorylation in Mitochondria of Transgenic Mice*
,
,
*
This work was supported by grants from the New York Academy
of Medicine "Speaker's Fund" (to M. D'A., C. D. G., and
G. M.), the ALS Association (to M. F. B.), and National Institutes
of Health Grant PO1-AG12992 (to M. F. B.).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Both authors contributed equally to this work.
§
To whom correspondence should be addressed: Weill Medical College
of Cornell University, 525 E. 68th St., A-505, New York, NY 10021. Tel.: 212-746-4605; Fax: 212-746-4803; E-mail:
gim2004@mail.med.cornell.edu.
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