Parallel Evolution under Chemotherapy Pressure in 29 Breast Cancer Cell Lines Results in Dissimilar Mechanisms of Resistance

Balint Tegze, Zoltan Imre Szallasi, Iren Haltrich, Zsofia Penzvalto, Zsuzsa Toth, Istvan Liko, Balazs Gyoerffy

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    Abstract

    Background: Developing chemotherapy resistant cell lines can help to identify markers of resistance. Instead of using a panel of highly heterogeneous cell lines, we assumed that truly robust and convergent pattern of resistance can be identified in multiple parallel engineered derivatives of only a few parental cell lines. Methods: Parallel cell populations were initiated for two breast cancer cell lines (MDA-MB-231 and MCF-7) and these were treated independently for 18 months with doxorubicin or paclitaxel. IC50 values against 4 chemotherapy agents were determined to measure cross-resistance. Chromosomal instability and karyotypic changes were determined by cytogenetics. TaqMan RT-PCR measurements were performed for resistance-candidate genes. Pgp activity was measured by FACS. Results: All together 16 doxorubicin-and 13 paclitaxel-treated cell lines were developed showing 2-46 fold and 3-28 fold increase in resistance, respectively. The RT-PCR and FACS analyses confirmed changes in tubulin isofom composition, TOP2A and MVP expression and activity of transport pumps (ABCB1, ABCG2). Cytogenetics showed less chromosomes but more structural aberrations in the resistant cells. Conclusion: We surpassed previous studies by parallel developing a massive number of cell lines to investigate chemoresistance. While the heterogeneity caused evolution of multiple resistant clones with different resistance characteristics, the activation of only a few mechanisms were sufficient in one cell line to achieve resistance.
    Original languageEnglish
    JournalP L o S One
    Volume7
    Issue number2
    Pages (from-to)e30804
    ISSN1932-6203
    DOIs
    Publication statusPublished - 2012

    Bibliographical note

    This is an Open Access article distributed under the terms of the Creative Commons Attribution-Noncommercial License 2.5, which permits unrestricted use, distribution, and reproduction in any noncommercial medium, provided the original work is properly cited.

    Keywords

    • BIOLOGY
    • TOPOISOMERASE-II ACTIVITY
    • MULTIDRUG-RESISTANCE
    • LUNG-CANCER
    • PACLITAXEL RESISTANCE
    • PREDICTS RESISTANCE
    • ACQUIRED-RESISTANCE
    • EXPRESSION
    • PROTEIN
    • AMPLIFICATION
    • DOXORUBICIN

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