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1 Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.; TARA Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.; Japan Society for the Promotion of Science (JSPS), 8 Ichiban-cho, Chiyoda-ku, Tokyo 102-8472, Japan. 2 Division of Chemotherapy, Chiba Cancer Center Research Institute, 666-2 Nitona, Chuo-ku, Chiba 260-8717, Japan.; Shimane University Faculty of Medicine, 89-1 Enya-cho, Izumo, Shimane 693-8501, Japan. 3 Shimane University Faculty of Medicine, 89-1 Enya-cho, Izumo, Shimane 693-8501, Japan. 4 Division of Chemotherapy, Chiba Cancer Center Research Institute, 666-2 Nitona, Chuo-ku, Chiba 260-8717, Japan. 5 Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan. 6 Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.; TARA Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
* To whom correspondence should be addressed.
Jun-Ichi Hayashi , E-mail: jih45{at}sakura.cc.tsukuba.ac.jp
These authors contributed equally to this work.
Mutations in mitochondrial DNA (mtDNA) occur at high frequencyin human tumors, but whether these mutations alter tumor cellbehavior has been unclear. We used cytoplasmic hybrid (cybrid)technology to replace the endogenous mtDNA in a mouse tumorcell line that was poorly metastatic with mtDNA from a cellline that was highly metastatic – and vice versa. Usingassays of metastasis in mice, we found that the recipient tumorcells acquired the metastatic potential of the transferred mtDNA.The mtDNA conferring high metastatic potential contained G13997Aand 13885insC mutations in the gene encoding NADH dehydrogenasesubunit 6 (ND6). These mutations produced a deficiency in respiratorycomplex I activity and were associated with overproduction ofreactive oxygen species (ROS). Pretreatment of the highly metastatictumor cells with ROS scavengers suppressed their metastaticpotential in mice. These results indicate that mtDNA mutationscan contribute to tumor progression by enhancing the metastaticpotential of tumor cells.
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