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Girst S, Marx C, Bräuer-Krisch E, Bravin A, Bartzsch S, Oelfke U, Greubel C, Reindl J, Siebenwirth C, Zlobinskaya O, Multhoff G, Dollinger G, Schmid TE, Wilkens JJ. Improved normal tissue protection by proton and X-ray microchannels compared to homogeneous field irradiation. Phys Med 2015; 31:615-20. [PMID: 25936621 DOI: 10.1016/j.ejmp.2015.04.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2014] [Revised: 04/02/2015] [Accepted: 04/10/2015] [Indexed: 11/30/2022] Open
Abstract
The risk of developing normal tissue injuries often limits the radiation dose that can be applied to the tumour in radiation therapy. Microbeam Radiation Therapy (MRT), a spatially fractionated photon radiotherapy is currently tested at the European Synchrotron Radiation Facility (ESRF) to improve normal tissue protection. MRT utilizes an array of microscopically thin and nearly parallel X-ray beams that are generated by a synchrotron. At the ion microprobe SNAKE in Munich focused proton microbeams ("proton microchannels") are studied to improve normal tissue protection. Here, we comparatively investigate microbeam/microchannel irradiations with sub-millimetre X-ray versus proton beams to minimize the risk of normal tissue damage in a human skin model, in vitro. Skin tissues were irradiated with a mean dose of 2 Gy over the irradiated area either with parallel synchrotron-generated X-ray beams at the ESRF or with 20 MeV protons at SNAKE using four different irradiation modes: homogeneous field, parallel lines and microchannel applications using two different channel sizes. Normal tissue viability as determined in an MTT test was significantly higher after proton or X-ray microchannel irradiation compared to a homogeneous field irradiation. In line with these findings genetic damage, as determined by the measurement of micronuclei in keratinocytes, was significantly reduced after proton or X-ray microchannel compared to a homogeneous field irradiation. Our data show that skin irradiation using either X-ray or proton microchannels maintain a higher cell viability and DNA integrity compared to a homogeneous irradiation, and thus might improve normal tissue protection after radiation therapy.
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Affiliation(s)
- S Girst
- Universität der Bundeswehr München, Neubiberg, Germany
| | - C Marx
- Department of Radiation Oncology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - E Bräuer-Krisch
- European Synchrotron Radiation Facility, Grenoble Cedex, France
| | - A Bravin
- European Synchrotron Radiation Facility, Grenoble Cedex, France
| | - S Bartzsch
- German Cancer Research Centre (DKFZ), Heidelberg, Germany; The Institute of Cancer Research, Sutton, United Kingdom
| | - U Oelfke
- German Cancer Research Centre (DKFZ), Heidelberg, Germany; The Institute of Cancer Research, Sutton, United Kingdom
| | - C Greubel
- Universität der Bundeswehr München, Neubiberg, Germany
| | - J Reindl
- Universität der Bundeswehr München, Neubiberg, Germany
| | - C Siebenwirth
- Universität der Bundeswehr München, Neubiberg, Germany; Department of Radiation Oncology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - O Zlobinskaya
- Universität der Bundeswehr München, Neubiberg, Germany
| | - G Multhoff
- Department of Radiation Oncology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - G Dollinger
- Universität der Bundeswehr München, Neubiberg, Germany
| | - T E Schmid
- Department of Radiation Oncology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - J J Wilkens
- Department of Radiation Oncology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany.
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Zlobinskaya O, Siebenwirth C, Greubel C, Hable V, Hertenberger R, Humble N, Reinhardt S, Michalski D, Röper B, Multhoff G, Dollinger G, Wilkens JJ, Schmid TE. The Effects of Ultra-High Dose Rate Proton Irradiation on Growth Delay in the Treatment of Human Tumor Xenografts in Nude Mice. Radiat Res 2014; 181:177-83. [DOI: 10.1667/rr13464.1] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Girst S, Dollinger G, Greubel C, Multhoff G, Reindl J, Schmid T, Siebenwirth C, Wilkens J, Zlobinskaya O. 79: Reduced side effects by proton microchannel radiotherapy – study in a human skin model. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)34100-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Schmid TE, Greubel C, Hable V, Zlobinskaya O, Michalski D, Girst S, Siebenwirth C, Schmid E, Molls M, Multhoff G, Dollinger G. Low LET protons focused to submicrometer shows enhanced radiobiological effectiveness. Phys Med Biol 2012; 57:5889-907. [DOI: 10.1088/0031-9155/57/19/5889] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Humble N, Allinger K, Assmann W, Bin J, Dollinger G, Drexler G, Friedl A, Hilz P, Kiefer D, Ma W, Michalski D, Molls M, Reinhardt S, Schmid T, Zlobinskaya O, Schreiber J, Wilkens J. 83 SINGLE SHOT HIGH DOSE CELL IRRADIATIONS WITH LASER-DRIVEN PROTONS. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)70060-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Zlobinskaya O, Dollinger G, Michalski D, Hable V, Greubel C, Du G, Multhoff G, Röper B, Molls M, Schmid TE. Induction and repair of DNA double-strand breaks assessed by gamma-H2AX foci after irradiation with pulsed or continuous proton beams. Radiat Environ Biophys 2012; 51:23-32. [PMID: 22228542 DOI: 10.1007/s00411-011-0398-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Accepted: 12/10/2011] [Indexed: 05/25/2023]
Abstract
In particle tumor therapy including beam scanning at accelerators, the dose per voxel is delivered within about 100 ms. In contrast, the new technology of laser plasma acceleration will produce ultimately shorter particle packages that deliver the dose within a nanosecond. Here, possible differences for relative biological effectiveness in creating DNA double-strand breaks in pulsed or continuous irradiation mode are studied. HeLa cells were irradiated with 1 or 5 Gy of 20-MeV protons at the Munich tandem accelerator, either at continuous mode (100 ms), or applying a single pulse of 1-ns duration. Cells were fixed 1 h after 1-Gy irradiation and 24 h after 5-Gy irradiation, respectively. A dose-effect curve based on five doses of X-rays was taken as reference. The total number of phosphorylated histone H2AX (gamma-H2AX) foci per cell was determined using a custom-made software macro for gamma-H2AX foci counting. For 1 h after 1-Gy 20-MeV proton exposures, values for the relative biological effectiveness (RBE) of 0.97 ± 0.19 for pulsed and 1.13 ± 0.21 for continuous irradiations were obtained in the first experiment 1.13 ± 0.09 and 1.16 ± 0.09 in the second experiment. After 5 Gy and 24 h, RBE values of 0.99 ± 0.29 and 0.91 ± 0.23 were calculated, respectively. Based on the gamma-H2AX foci numbers obtained, no significant differences in RBE between pulsed and continuous proton irradiation in HeLa cells were detected. These results are well in line with our data on micronucleus induction in HeLa cells.
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Affiliation(s)
- O Zlobinskaya
- Klinikum rechts der Isar, Department of Radiation Oncology, Technische Universität Muenchen, Ismaninger Strasse 22, 81675, Munich, Germany.
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Schmid T, Zlobinskaya O, Michalski D, Wilkens J, Gehrmann M, Bayer C, Multhoff G. 80 SERUM HSP70 – A SOLUBLE, TUMOR-SPECIFIC MARKER IN XENOGRAFT TUMOR MOUSE MODELS. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)70057-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Schmid T, Zlobinskaya O, Siebenwirth C, Greubel C, Hable V, Schell S, Reinhardt S, Molls M, Dollinger G, Wilkens J. A Comparison of the Effects of Irradiation with Continuous and Pulsed Proton Beams on Tumor Growth Delay in Mice. Int J Radiat Oncol Biol Phys 2011. [DOI: 10.1016/j.ijrobp.2011.06.1294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Schmid TE, Dollinger G, Hable V, Greubel C, Zlobinskaya O, Michalski D, Auer S, Friedl AA, Schmid E, Molls M, Röper B. The Effectiveness of 20 MeV Protons at Nanosecond Pulse Lengths in Producing Chromosome Aberrations in Human-Hamster Hybrid Cells. Radiat Res 2011; 175:719-27. [DOI: 10.1667/rr2465.1] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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