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Frequent and histological type-specific inactivation of 14-3-3σ in human lung cancers

Oncogene volume 21, pages 2418–2424 (2002)Cite this article

Abstract

One isoform of the 14-3-3 family, 14-3-3σ, plays a crucial role in the G2 checkpoint by sequestering Cdc2-cyclinB1 in the cytoplasm, and the expression of 14-3-3σ is frequently lost in breast cancers. This loss of expression is thought to cause a G2 checkpoint defect, resulting in chromosomal aberrations. Since lung cancers frequently carry numerous chromosomal aberrations, we examined the DNA methylation status and expression level of the 14-3-3σ gene in 37 lung cancer cell lines and 30 primary lung tumor specimens. We found that small cell lung cancer (SCLC) cell lines frequently showed DNA hypermethylation (9 of 13 lines, 69%), and subsequent silencing of the 14-3-3σ gene. Among non-small cell lung cancers (NSCLC), large cell lung cancer cell lines showed frequent hypermethylation and silencing of 14-3-3σ (4 or 7 lines, 57%). In contrast, in other NSCLC cell lines, hypermethylation occurred very rarely (1 of 17 lines, 6%). All eight primary SCLC specimens examined also showed a loss or significant reduction in 14-3-3σ expression in vivo, while a loss or reduction of 14-3-3σ expression was very rare in primary NSCLC specimens (1 of 22 tissues, 5%). This is the first description that indicates lung cancers frequently show significant inactivation of the 14-3-3σ gene mainly due to DNA hypermethylation in SCLC, but rarely in NSCLC, suggesting involvement of the 14-3-3σ gene in lung tumorigenesis in a histological type-specific manner.

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Acknowledgements

This work was supported in part by a Grant-in-Aid for the Second Term Comprehensive Ten-Year Strategy for Cancer Control and a Grant-in-Aid for Cancer Research from the Ministry of Health, Labour, and Welfare, Japan; as well as a Grant-in-Aid for Scientific Research (C) from the Ministry of Education, Science, Sports and Culture, Japan. We would also like to thank Drs CC Harris (National Cancer Institute), LJ Old (Memorial Sloan Kettering Cancer Center), M Akiyama (Radiation Effect Research Foundation), and Y Hayata (Tokyo Medical University) for their generous gifts of cell lines.

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Authors and Affiliations

  1. Division of Molecular Oncology, Aichi Cancer Center Research Institute, 1-1 Kanokoden, Chikusa-ku, Nagoya, 464-8681, Japan

    Hirotaka Osada, Yoshio Tatematsu, Taku Nakagawa, Hiroyuki Konishi, Tomoko Harano, Ekmel Tezel & Takashi Takahashi

  2. Department of Pathology and Molecular Diagnostics, Aichi Cancer Center Hospital, 1-1 Kanokoden, Chikusa-ku, Nagoya, 464-8681, Japan

    Yasushi Yatabe

  3. Pulmonary Medicine, Rinku General Medical Center, Izumisano-shi, Osaka, 598-8577, Japan

    Minoru Takada

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  1. Hirotaka Osada
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  2. Yoshio Tatematsu
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Correspondence to Hirotaka Osada.

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Osada, H., Tatematsu, Y., Yatabe, Y. et al. Frequent and histological type-specific inactivation of 14-3-3σ in human lung cancers. Oncogene 21, 2418–2424 (2002). https://doi.org/10.1038/sj.onc.1205303

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