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The Journal of Neuroscience, January 1, 1998, 18(1):205-213

Mitochondrial Susceptibility to Oxidative Stress Exacerbates Cerebral Infarction That Follows Permanent Focal Cerebral Ischemia in Mutant Mice with Manganese Superoxide Dismutase Deficiency

Kensuke Murakami1, Takeo Kondo1, Makoto Kawase1, 2, Yibing Li1, Shuzo Sato1, Sylvia F. Chen1, and Pak H. Chan1, 2

1 CNS Injury and Edema Research Center, Departments of Neurological Surgery and Neurology, University of California, School of Medicine, San Francisco, California 94143-0651, and 2 Departments of Neurosurgery, Neurology, and Neurological Sciences, Stanford University Medical Center, Stanford, California 94305-5784

Mitochondrial injury has been implicated in ischemic neuronal injury. Mitochondria, producing adenosine triphosphate by virtue of electron flow, have been shown to be both the sites of superoxide anion (O2-) production and the target of free radical attacks. We evaluated these mechanisms in an in vivo cerebral ischemia model, using mutant mice with a heterozygous knock-out gene (Sod2 -/+) encoding mitochondrial manganese superoxide dismutase (Mn-SOD). Sod2 -/+ mice demonstrated a prominent increase in O2- production under normal physiological conditions and in ischemia, as evidenced by specific oxidation of a fluorescent probe, hydroethidine, reflecting decreased activity of Mn-SOD. A mitochondrial viability assay that used rhodamine 123, which is accumulated by transmembrane potential of viable mitochondria, demonstrated accelerated development of mitochondrial injury. This rapid progress of ischemic injury resulted in exacerbation of infarct size and hemisphere enlargement, causing advanced neurological deficits but without altering DNA fragmentation induction. The present study suggests that O2- overproduced in a mitochondrial compartment, when uncoupled from antioxidant defenses, induces impairment of mitochondrial function and causes exacerbation of cerebral infarction after ischemia.

Key words: cerebral ischemia; oxidative stress; manganese superoxide dismutase; superoxide anion; mitochondrial injury; DNA fragmentation


Copyright © 1998 Society for Neuroscience  0270-6474/98/181205-09$05.00/0


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