Abstract
Because glutathione scavenges reactive oxygen species (ROS) and also donates electrons to antioxidative systems, it may compensate for the oxidative stress caused by SOD1 deficiency. The cystine/glutamate transporter, which consists of two proteins, xCT and 4F2hc, has been designated system x −c . This transporter system plays a role in the maintenance of glutathione levels in mammalian cells. In the present study, we created SOD1 −/−; xCT −/− double-knockout mice by intercrossing xCT-knockout and SOD1-knockout animals. We determined if the double-knockout mice express the phenotypic characteristics unique to SOD1 −/− mice—increased oxidative stress and the production of autoantibodies against erythrocytes. We also compared the phenotype of the double-knockout mice with those of the single-knockout and wild-type mice. Although two major antioxidative systems were found to be defective in the SOD1 −/−; xCT −/− mice, relative to the SOD1 −/− mice, no functional deficits were observed. Based on these results, it appears that defects in system x −c do not exacerbate the phenotypic consequences of SOD1 deficiency in postnatal mice under ordinary breeding conditions.
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This work was supported, in part, by the 21st Century COE Program from the Japan Society for the Promotion of Science (JSPS).
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Iuchi, Y., Kibe, N., Tsunoda, S. et al. Deficiency of the cystine-transporter gene, xCT, does not exacerbate the deleterious phenotypic consequences of SOD1 knockout in mice. Mol Cell Biochem 319, 125–132 (2008). https://doi.org/10.1007/s11010-008-9885-3
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DOI: https://doi.org/10.1007/s11010-008-9885-3