Volume 34, Issue 11 p. 1670-1678
Research Article

Interactomic approach for evaluating nucleophosmin-binding proteins as biomarkers for Ewing's sarcoma

Ayako Haga

Ayako Haga

Division of Pharmaco-proteomics, National Cancer Center Research Institute, Tsukiji, Chuo-ku, Tokyo, Japan

Department of Biological Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, Yamazaki, Noda-shi, Chiba, Japan

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Yoko Ogawara

Yoko Ogawara

Division of Hematological Malignancy, National Cancer Center Research Institute, Tsukiji, Chuo-ku, Tokyo, Japan

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Daisuke Kubota

Daisuke Kubota

Division of Pharmaco-proteomics, National Cancer Center Research Institute, Tsukiji, Chuo-ku, Tokyo, Japan

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Issay Kitabayashi

Issay Kitabayashi

Division of Hematological Malignancy, National Cancer Center Research Institute, Tsukiji, Chuo-ku, Tokyo, Japan

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Yasufumi Murakami

Yasufumi Murakami

Department of Biological Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, Yamazaki, Noda-shi, Chiba, Japan

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Tadashi Kondo

Corresponding Author

Tadashi Kondo

Division of Pharmaco-proteomics, National Cancer Center Research Institute, Tsukiji, Chuo-ku, Tokyo, Japan

Correspondence: Dr. Tadashi Kondo, Division of Pharmacoproteomics, National Cancer Center Research Institute, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan

E-mail:[email protected]

Fax: +81-3-3547-5298

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First published: 11 March 2013
Citations: 12

Abstract

Nucleophosmin (NPM) is a novel prognostic biomarker for Ewing's sarcoma. To evaluate the prognostic utility of NPM, we conducted an interactomic approach to characterize the NPM protein complex in Ewing's sarcoma cells. A gene suppression assay revealed that NPM promoted cell proliferation and the invasive properties of Ewing's sarcoma cells. FLAG-tag-based affinity purification coupled with liquid chromatography-tandem mass spectrometry identified 106 proteins in the NPM protein complex. The functional classification suggested that the NPM complex participates in critical biological events, including ribosome biogenesis, regulation of transcription and translation, and protein folding, that are mediated by these proteins. In addition to JAK1, a candidate prognostic biomarker for Ewing's sarcoma, the NPM complex, includes 11 proteins known as prognostic biomarkers for other malignancies. Meta-analysis of gene expression profiles of 32 patients with Ewing's sarcoma revealed that 6 of 106 were significantly and independently associated with survival period. These observations suggest a functional role as well as prognostic value of these NPM complex proteins in Ewing's sarcoma. Further, our study suggests the potential applications of interactomics in conjunction with meta-analysis for biomarker discovery.