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Molecular Cytogenetics

The PEBP2β/CBFβ-SMMHC chimeric protein is localized both in the cell membrane and nuclear subfractions of leukemic cells carrying chromosomal inversion 16

Leukemia volume 14, pages 1253–1259 (2000)Cite this article

Abstract

The chromosomal inversion (16)(p13q22), which is associated with the M4-eosinophilia subtype of human acute myeloid leukemia, causes the fusion of two distinct genes. The polypeptide encoded by the chimeric gene, PEBP2β/CBFβ-SMMHC, retains the ability to interact with, and dominantly interfere with the function of proteins possessing the Runt homology domain. The Runt protein homologs constitute the DNA binding subunit of the PEBP2/CBF transcription factor. We examined the subcellular localization of PEBP2β/CBFβ-SMMHC, as well as that of Runt protein homologs in leukemic cells carrying inversion 16 by immunoblot analysis. A significant amount of the PEBP2β/CBFβ-SMMHC protein was recovered from the nuclear fraction along with the Runt protein homologs. Furthermore, some of both polypeptides was retained in the DNA pellet that represents the material remaining after extraction of nuclear fraction with high salt. These observations suggest that the so-called dominant interfering effect of PEBP2β/CBFβ-SMMHC on PEBP2/CBF occurs inside the nucleus. In addition, we could detect PEBP2β/CBFβ-SMMHC in the cytoplasmic membrane fraction as well. The function of this membrane-located PEBP2β/CBFβ-SMMHC, if any, appears to be unrelated to that of Runt protein homologs.

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Acknowledgements

We thank T Suzuki for technical advice on immunofluorescence and Ms I Imamura and Ms A Yao for secretarial assistance. This work was supported in part by research grants from the Ministry of Education, Science, Sports and Culture and the Ministry of Health and Welfare of Japan.

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Authors and Affiliations

  1. Department of Molecular Immunology, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan

    S Kanto, N Chiba, Y Tanaka, T Watanabe & M Satake

  2. Department of Urology, School of Medicine, Tohoku University, Sendai, Japan

    S Kanto, K Yoshikawa, A Fukuzaki & S Orikasa

  3. The First Department of Internal Medicine, School of Medicine, Ehime University, Ehime, Japan

    S Fujita

  4. Department of Pediatrics, Iwate Medical University, Morioka, Japan

    M Endo

  5. Department of Cancer Cytogenetics, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan

    N Kamada

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Kanto, S., Chiba, N., Tanaka, Y. et al. The PEBP2β/CBFβ-SMMHC chimeric protein is localized both in the cell membrane and nuclear subfractions of leukemic cells carrying chromosomal inversion 16. Leukemia 14, 1253–1259 (2000). https://doi.org/10.1038/sj.leu.2401821

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