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In vitro effects of Cyberknife-driven intermittent irradiation on glioblastoma cell lines

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Abstract

Radiosurgery is used increasingly upon recurrence of high-grade gliomas to deliver a high dose of focused radiation to a defined target. The purpose of our study was to compare intermittent irradiation (IIR) by using a CyberKnife (CK) with continuous irradiation (CIR) by using a conventional linear accelerator (LINAC). A significant decrease in surviving fraction was observed after IIR irradiation compared with after CIR at a dose of 8 Gy. Three hours after irradiation, most of the DNA damage was repaired in U87. Slightly higher basal levels of Ku70/80 mRNA were found in U87 compared with A172, while radiation treatment induced only minor regulation of Ku70/80 and Rad51 transcription in either cell lines. IIR treatment using CK significantly decreased the survival in U87 and A172 compared with CIR. Although the two cell lines differed in DNA repair capability, the role of Ku70/80 and Rad51 in the cell line radiosensitivity seemed marginal.

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Acknowledgments

The authors are grateful to Achille Bergantin (C.D.I., Milan, Italy), Emanuele Pignoli and Francesca Valvo (Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy) for excellent technical support with irradiations, Sara Guzzetti (Lab of Experimental Neurooncology) for p53 analysis, Ida Milanesi (Radiotherapy Unit) and Andrea Smith (U.O. Cerebrovascular Diseases) for critical reading of the manuscript.

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Authors and Affiliations

  1. Laboratory of Clinical Investigation, Fondazione IRCCS Istituto Neurologico “C. Besta”, Via Celoria 11, 20133, Milan, Italy

    Alessandra Canazza, Ugo De Grazia, Danilo Croci & Emilio Ciusani

  2. Radiotherapy Unit, Fondazione IRCCS Istituto Neurologico “C. Besta”, Via Celoria 11, 20133, Milan, Italy

    Luisa Fumagalli, Francesco Ghielmetti & Laura Fariselli

  3. Cyberknife Unit, Centro Diagnostico Italiano, Via Saint Bon 20, 20147, Milan, Italy

    Lorenzo Brait

  4. Department of Neurooncology, Fondazione IRCCS Istituto Neurologico “C. Besta”, Via Celoria 11, 20133, Milan, Italy

    Andrea Salmaggi

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  1. Alessandra Canazza
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  2. Ugo De Grazia
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  3. Luisa Fumagalli
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  4. Lorenzo Brait
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  9. Emilio Ciusani
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Correspondence to Emilio Ciusani.

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Canazza, A., De Grazia, U., Fumagalli, L. et al. In vitro effects of Cyberknife-driven intermittent irradiation on glioblastoma cell lines. Neurol Sci 32, 579–588 (2011). https://doi.org/10.1007/s10072-011-0485-8

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  • DOI: https://doi.org/10.1007/s10072-011-0485-8

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