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BCR-ABL Studies

Biological effects induced by variable levels of BCR-ABL protein in the pluripotent hematopoietic cell line UT-7

Leukemia volume 14, pages 662–670 (2000)Cite this article

Abstract

There is currently no satisfactory model allowing analysis of dose–effect relationships of BCR-ABL proteins in human hematopoietic cells. To study comparatively the proliferative, differentiative and anti-apoptotic actions of different levels of BCR-ABL proteins in the context of the same cellular background, we have introduced the BCR-ABL gene into the GM-CSF-dependent pluripotent human cell line UT-7. Individual clones expressing BCR-ABL were analyzed by Western blots. After normalization to equivalent levels of endogenous ABL protein, 14 clones always grown in GM-CSF were found to express low but variable levels of BCR-ABL whereas two clones selected in the absence of GM-CSF expressed very high levels of BCR-ABL. All low-level BCR-ABL expressing clones exhibited a behavior similar to that of the GM-CSF-dependent parental cells as they ceased to proliferate upon growth factor deprivation and showed a strong proliferative response upon GM-CSF addition. One out of 14 clones showed progressive GM-CSF independence during culture over several weeks and was found to have a significant increase of BCR-ABL expression at that time. The resistance of this clone (E8–2) to different apoptotic stimuli was found to be increased as compared to its low BCR-ABL-expressing counterpart (E8–1) and similar to that observed in clones with very high levels of BCR-ABL (UT-7/9 and UT-7/11) which were totally resistant to apoptotic stimuli. When injected into nude mice, parental UT-7 cells and clones with low-level of BCR-ABL were not tumorigenic over 10 weeks of observation whereas UT-7 clones with high levels of BCR-ABL (UT-7/9, UT-7/11 and UT-7/E8–2) induced aggressive tumors in 2–4 weeks with a significant correlation between the amount of BCR-ABL protein and the rate of tumor growth. In conclusion, the establishment of an in vitro and in vivo CML model using UT-7 cells suggests for the first time in human cells, that the fully transformed phenotype induced by BCR-ABL requires high levels of BCR-ABL expression. These findings suggest that variable levels of BCR-ABL in primary patient cells could also be responsible for the different phenotypic features seen in chronic and acute phases of CML, such as the differentiation ability induced by growth factors.

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Acknowledgements

This work was supported by grants from the Association de Recherche sur le Cancer (ARC), la Ligue nationale Contre le Cancer, INSERM and Institut Gustave Roussy.

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  1. C Issaad and M Ahmed: The first two authors contributed equally to this work

Authors and Affiliations

  1. INSERM U362, Institut Gustave-Roussy, Villejuif, France

    C Issaad, M Ahmed, S Novault, ML Bonnet, W Vainchenker & AG Turhan

  2. CNRS URA 1461, Hôpital Necker, Paris, France

    T Bennardo & B Varet

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  1. C Issaad
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Issaad, C., Ahmed, M., Novault, S. et al. Biological effects induced by variable levels of BCR-ABL protein in the pluripotent hematopoietic cell line UT-7. Leukemia 14, 662–670 (2000). https://doi.org/10.1038/sj.leu.2401730

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