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Originally published in Science Express on 3 April 2008
Science 2 May 2008:
Vol. 320. no. 5876, pp. 661 - 664
DOI: 10.1126/science.1156906
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Reports

ROS-Generating Mitochondrial DNA Mutations Can Regulate Tumor Cell Metastasis

Kaori Ishikawa,1,2,3* Keizo Takenaga,4,5* Miho Akimoto,5 Nobuko Koshikawa,4 Aya Yamaguchi,1 Hirotake Imanishi,1 Kazuto Nakada,1,2 Yoshio Honma,5 Jun-Ichi Hayashi1{dagger}

Mutations in mitochondrial DNA (mtDNA) occur at high frequency in human tumors, but whether these mutations alter tumor cell behavior has been unclear. We used cytoplasmic hybrid (cybrid) technology to replace the endogenous mtDNA in a mouse tumor cell line that was poorly metastatic with mtDNA from a cell line that was highly metastatic, and vice versa. Using assays of metastasis in mice, we found that the recipient tumor cells acquired the metastatic potential of the transferred mtDNA. The mtDNA conferring high metastatic potential contained G13997A and 13885insC mutations in the gene encoding NADH (reduced form of nicotinamide adenine dinucleotide) dehydrogenase subunit 6 (ND6). These mutations produced a deficiency in respiratory complex I activity and were associated with overproduction of reactive oxygen species (ROS). Pretreatment of the highly metastatic tumor cells with ROS scavengers suppressed their metastatic potential in mice. These results indicate that mtDNA mutations can contribute to tumor progression by enhancing the metastatic potential of tumor cells.

1 Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
2 Tsukuba Advanced Research Alliance Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
3 Japan Society for the Promotion of Science (JSPS), 8 Ichibancho, Chiyoda-ku, Tokyo 102-8472, Japan.
4 Division of Chemotherapy, Chiba Cancer Center Research Institute, 666-2 Nitona, Chuo-ku, Chiba 260-8717, Japan.
5 Shimane University Faculty of Medicine, 89-1 Enya-cho, Izumo, Shimane 693-8501, Japan.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: jih45{at}sakura.cc.tsukuba.ac.jp

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