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Johnston SRD, Gómez H, Stemmer SM, Richie M, Durante M, Pandite L, Goodman V, Slamon D. A randomized and open-label trial evaluating the addition of pazopanib to lapatinib as first-line therapy in patients with HER2-positive advanced breast cancer. Breast Cancer Res Treat 2013; 137:755-66. [DOI: 10.1007/s10549-012-2399-4] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Accepted: 12/21/2012] [Indexed: 11/30/2022]
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102
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Horcicka M, Meyer C, Buschbacher A, Durante M, Krämer M. Algorithms for the optimization of RBE-weighted dose in particle therapy. Phys Med Biol 2012; 58:275-86. [PMID: 23257239 DOI: 10.1088/0031-9155/58/2/275] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We report on various algorithms used for the nonlinear optimization of RBE-weighted dose in particle therapy. Concerning the dose calculation carbon ions are considered and biological effects are calculated by the Local Effect Model. Taking biological effects fully into account requires iterative methods to solve the optimization problem. We implemented several additional algorithms into GSI's treatment planning system TRiP98, like the BFGS-algorithm and the method of conjugated gradients, in order to investigate their computational performance. We modified textbook iteration procedures to improve the convergence speed. The performance of the algorithms is presented by convergence in terms of iterations and computation time. We found that the Fletcher-Reeves variant of the method of conjugated gradients is the algorithm with the best computational performance. With this algorithm we could speed up computation times by a factor of 4 compared to the method of steepest descent, which was used before. With our new methods it is possible to optimize complex treatment plans in a few minutes leading to good dose distributions. At the end we discuss future goals concerning dose optimization issues in particle therapy which might benefit from fast optimization solvers.
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103
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Grün R, Friedrich T, Elsässer T, Krämer M, Zink K, Karger CP, Durante M, Engenhart-Cabillic R, Scholz M. Impact of enhancements in the local effect model (LEM) on the predicted RBE-weighted target dose distribution in carbon ion therapy. Phys Med Biol 2012; 57:7261-74. [PMID: 23075883 DOI: 10.1088/0031-9155/57/22/7261] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Biological optimization for treatment planning in carbon ion therapy is currently based on the first version of the local effect model (LEM I). Further developments implemented in the latest version (LEM IV) allowed to predict more accurately the Relative Biological Effectiveness (RBE) in-vitro. The main goal of this study is to compare the LEM IV against LEM I under treatment-like conditions for idealized target geometries. Therefore, physical dose distributions resulting from the biological optimization with LEM I were used to recalculate the RBE-weighted dose distribution based on LEM IV. Input parameters representing the clinical endpoints late toxicity in the central nervous system and the tumor control for chordoma were chosen to investigate the impact of changes on the predicted isoeffective dose levels. The recalculated RBE-weighted dose distributions show an increase within the target region, and the mean RBE-weighted dose values are dependent on the geometry and decrease with increasing target dimension. The differences between predictions of LEM IV and LEM I are less than 10% for typical tumor volumes treated in the pilot project at GSI. Median RBE-weighted doses predicted by LEM IV in the target region are consistent with clinically observed dose-response behavior as demonstrated by comparison to the 5-year local control curve for skull base chordoma.
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104
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Munster P, van der Noll R, Voest E, Specht J, Werner T, Dees E, Tan A, Daud A, Schellens J, Lolkema M, Griffin M, Agarwal N, Falchook G, Kleha J, Durante M, Smith D, Adams L, Greshock J, Morris S, Kurzrock R. PI3K Kinase Inhibitor GSK2126458 (GSK458): Clinical Activity in Select Patient (PT) Populations Defined by Predictive Markers (STUDY P3K112826). Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)33038-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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105
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Kaderka R, Schardt D, Durante M, Berger T, Ramm U, Licher J, La Tessa C. Out-of-field dose measurements in a water phantom using different radiotherapy modalities. Phys Med Biol 2012; 57:5059-74. [PMID: 22836598 DOI: 10.1088/0031-9155/57/16/5059] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
This investigation focused on the characterization of the lateral dose fall-off following the irradiation of the target with photons, protons and carbon ions. A water phantom was irradiated with a rectangular field using photons, passively delivered protons as well as scanned protons and carbon ions. The lateral dose profile in the depth of the maximum dose was measured using an ion chamber, a diamond detector and thermoluminescence detectors TLD-600 and TLD-700. The yield of thermal neutrons was estimated for all radiation types while their complete spectrum was measured with bubble detectors during the irradiation with photons. The peripheral dose delivered by photons is significantly higher compared to both protons and carbon ions and exceeds the latter by up to two orders of magnitude at distances greater than 50 mm from the field. The comparison of passive and active delivery techniques for protons shows that, for the chosen rectangular target shape, the former has a sharper penumbra whereas the latter has a lower dose in the far-out-of-field region. When comparing scanning treatments, carbon ions present a sharper dose fall-off than protons close to the target but increasing peripheral dose with increasing incident energy. For photon irradiation, the contribution to the out-of-field dose of photoneutrons appears to be of the same order of magnitude as the scattered primary beam. Charged particles show a clear supremacy over x-rays in achieving a higher dose conformality around the target and in sparing the healthy tissue from unnecessary radiation exposure. The out-of-field dose for x-rays increases with increasing beam energy because of the production of biologically harmful neutrons.
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106
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107
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Krämer M, Scifoni E, Wälzlein C, Durante M. Ion beams in radiotherapy - from tracks to treatment planning. ACTA ACUST UNITED AC 2012. [DOI: 10.1088/1742-6596/373/1/012017] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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108
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Eley J, Graeff C, Lüchtenborg R, Durante M, Howell R, Newhauser W, Bert C. WE-G-213CD-01: 4D Optimization for Scanned Ion Beam Tracking Therapy for Moving Tumors. Med Phys 2012; 39:3970. [DOI: 10.1118/1.4736202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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109
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Kaderka R, Durante M, Berger T, Reitz G, Tessa CL. MO-D-BRB-11: Out-Of-Field Dose Measurements in Radiotherapy Using Photons and Particles. Med Phys 2012; 39:3868. [DOI: 10.1118/1.4735792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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110
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Steidl P, Richter D, Schuy C, Schubert E, Haberer T, Durante M, Bert C. A breathing thorax phantom with independently programmable 6D tumour motion for dosimetric measurements in radiation therapy. Phys Med Biol 2012; 57:2235-50. [DOI: 10.1088/0031-9155/57/8/2235] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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111
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Kraemer M, Kraft-Weyrather W, Scifoni E, Durante M. 200 ADAPTIVE TREATMENT PLANNING WITH TRIP98. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)70170-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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112
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Constantinescu A, Blanck O, Durante M, Bert C. 215 NON-INVASIVE TREATMENT OF ATRIAL FIBRILLATION WITH A SCANNED CARBON ION BEAM. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)70184-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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113
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Jakob B, Durante M. Radiation dose detection by imaging response in biological targets. Radiat Res 2012; 177:524-32. [PMID: 22332929 DOI: 10.1667/rr2452.1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Imaging was one of the earliest techniques to quantify radiation dose. While films and active fluorescent detectors are still commonly used in physical dosimetry, biological imaging is emerging as a new method to visualize and quantify radiation dose in biological targets. Methods for biological imaging are normally based on molecular fluorescent probes, labeling chromatin-conjugated molecules or specific repair proteins. Examples are chromatin-binding coumarin compounds, which become fluorescent under irradiation, or the H2AX histone, which is rapidly phosphorylated at sites of DNA double-strand breaks and can be visualized by immunostaining. Many other DNA repair proteins can be expressed with fluorescent targets, such as green fluorescent protein, thus becoming visible for dose estimation in vivo. The possibility to visualize radiation damage in living biological targets is particularly important for repair kinetic studies, for estimating individual radiation response, and for remote control of living samples exposed to radiation, for instance in robotic space missions. In vivo dose monitoring in particle therapy exploits the production of positron emitters by nuclear interaction of the incident beam in the patient's body. Positron emission tomography (PET) can then be used to visualize and quantify the particle dose in the patient, and it can in principle also be used for radiotherapy with high-energy X rays. Alternatively, prompt γ rays or scattered secondary particles are under study for in vivo dosimetry of ion beams in therapy.
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Paludetti P, De Chirico C, Durante M, Cinquetti S. [The network of palliative care for persons with incurable disease in the Local Health Agency n. 7 of the Veneto region]. ANNALI DI IGIENE : MEDICINA PREVENTIVA E DI COMUNITA 2012; 24:45-51. [PMID: 22880385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Only 20% of terminally ill people with cancer in Italy are assisted by a network of palliative care, whereas the majority of them die in the hospital, against their will, and with very low doses of opioids. A palliative care service, is offered by the Nucleus of Palliative care within the Operative Unit of District Primary Care in the local health agency n. 7 of Pieve di Soligo. This service takes charge of the patient from hospital discharge until his/her death, working in concert with the inpatieint hospitals and other territorial health care structures. In this way, the patient and his/her family are followed by a team of professionals working together in coordination and collaboration. In 2010 the percentage of terminally ill persons enrolled in the program was 52%, much greater than the standard of 45% required by ministerial law (DM no 43 del 2007) for the local health agencies without a hospice. The duration of time spent at home during the last phases of the illness was over 90% of time in care, with an in-home mortality of 63%. The consumption of major opioids was amongst the highest in Italy. Thanks to the opening of a hospice, already planned, we will be able to take charge within the network of palliative care thos sick people who cannot remain in the home and extend the service to ill persons without cancer in conditions of advanced incurable disease and end of life.
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115
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Gemmel A, Rietzel E, Kraft G, Durante M, Bert C. Calculation and experimental verification of the RBE-weighted dose for scanned ion beams in the presence of target motion. Phys Med Biol 2011; 56:7337-51. [DOI: 10.1088/0031-9155/56/23/001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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116
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117
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Eley J, Lüchtenborg R, Richter D, Durante M, Bert C. TH-C-BRC-09: Tracking Moving Tumors with a Scanned Carbon Beam: Robustness to Changing Target Motion Characteristics and Tracking Uncertainties. Med Phys 2011. [DOI: 10.1118/1.3613526] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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118
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Durante M, Sihver L, Aird E, Jereczek-Fossa B, van den Heuvel F. 123 speaker DOSIMETRY FOR NORMAL TISSUE RISK ASSESSMENT: MEASUREMENT AND CALCULATION OF THE DOSES RECEIVED BY NORMAL TISSUES FROM RADIATION THERAPY FROM CURRENT AND EMERGING MODALITIES. Radiother Oncol 2011. [DOI: 10.1016/s0167-8140(11)70245-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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119
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Pignalosa D, Durante M. Cellular effects of energetic heavy ions: from DNA breaks to chromosomal rearrangements. RADIATION PROTECTION DOSIMETRY 2011; 143:391-393. [PMID: 21183534 DOI: 10.1093/rpd/ncq514] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Risk from exposure to energetic heavy ions is considered one of the main problems for human space exploration. Late stochastic risk estimates, particularly cancer, are affected by large uncertainties. Basic cell biology studies to elucidate the mechanisms involved in genetic damage are necessary to reduce the uncertainty and eventually design effective countermeasures. To study the influence of nuclear architecture on the formation of chromosomal rearrangements, normal diploid human fibroblasts have been exposed to heavy ions in horizontal and vertical positions. Analysis of chromosomal aberrations by arm-specific mFISH shows that, at the same radiation dose, the yield of chromosomal damage is modified by the irradiation geometry. A clear difference is seen in the fraction of aberrant cells, owing to the different nuclear cross sections.
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120
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Caretto S, Quarta A, Durante M, Nisi R, De Paolis A, Blando F, Mita G. Methyl jasmonate and miconazole differently affect arteminisin production and gene expression in Artemisia annua suspension cultures. PLANT BIOLOGY (STUTTGART, GERMANY) 2011; 13:51-8. [PMID: 21143725 DOI: 10.1111/j.1438-8677.2009.00306.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Artemisia annua L. is a herb traditionally used for treatment of fevers. The glandular trichomes of this plant accumulate, although at low levels, artemisinin, which is highly effective against malaria. Due to the great importance of this compound, many efforts have been made to improve knowledge on artemisinin production both in plants and in cell cultures. In this study, A. annua suspension cultures were established in order to investigate the effects of methyl jasmonate (MeJA) and miconazole on artemisinin biosynthesis. Twenty-two micro molar MeJA induced a three-fold increase of artemisinin production in around 30 min; while 200 μm miconazole induced a 2.5-fold increase of artemisinin production after 24 h, but had severe effects on cell viability. The influence of these treatments on expression of biosynthetic genes was also investigated. MeJA induced up-regulation of CYP71AV1, while miconazole induced up-regulation of CPR and DBR2.
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121
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Durante M, Quarta A, Nisi R, De Paolis A, Mita G, Caretto S. Effect of dimethyl-beta-cyclodextrins on artemisinin production in Artemisia annua suspension cell cultures. J Biotechnol 2010. [DOI: 10.1016/j.jbiotec.2010.09.764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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122
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Durante M, Keltz M. Chlamydia trachomatis serology screening in infertility is a significant prognosticator of pregnancy in non-IVF cycles. Fertil Steril 2010. [DOI: 10.1016/j.fertnstert.2010.07.049] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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123
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Pugliese M, Bengin V, Casolino M, Roca V, Zanini A, Durante M. Tests of shielding effectiveness of Kevlar and Nextel onboard the International Space Station and the Foton-M3 capsule. RADIATION AND ENVIRONMENTAL BIOPHYSICS 2010; 49:359-363. [PMID: 20364264 DOI: 10.1007/s00411-010-0283-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2009] [Accepted: 03/20/2010] [Indexed: 05/29/2023]
Abstract
Radiation assessment and protection in space is the first step in planning future missions to the Moon and Mars, where mission and number of space travelers will increase and the protection of the geomagnetic shielding against the cosmic radiation will be absent. In this framework, the shielding effectiveness of two flexible materials, Kevlar and Nextel, were tested, which are largely used in the construction of spacecrafts. Accelerator-based tests clearly demonstrated that Kevlar is an excellent shield for heavy ions, close to polyethylene, whereas Nextel shows poor shielding characteristics. Measurements on flight performed onboard of the International Space Station and of the Foton-M3 capsule have been carried out with special attention to the neutron component; shielded and unshielded detectors (thermoluminescence dosemeters, bubble detectors) were exposed to a real radiation environment to test the shielding properties of the materials under study. The results indicate no significant effects of shielding, suggesting that thin shields in low-Earth Orbit have little effect on absorbed dose.
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124
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Friedrich T, Weyrather W, Elsässer T, Durante M, Scholz M. Accuracy of RBE: experimental and theoretical considerations. RADIATION AND ENVIRONMENTAL BIOPHYSICS 2010; 49:345-349. [PMID: 20556619 DOI: 10.1007/s00411-010-0298-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2009] [Accepted: 05/21/2010] [Indexed: 05/29/2023]
Abstract
The concept of the relative biological effectiveness (RBE) is essential for treatment planning in carbon ion therapy and for understanding the biological effects of high-LET radiation. As this quantity depends on many factors, both its experimental determination and the assessment of its uncertainty are not trivial. For the limiting case of zero dose, where the RBE takes its maximum value RBE(alpha), we present in this article a simple empirical-based approach to estimate its uncertainty. A Gaussian error calculus is applied to equally take into account both uncertainties from experiments with high- and low-LET radiation. From a theoretical point of view, we then infer, using a simple Monte Carlo model, the distribution of RBE(alpha) values. This illustrates why the conventional error propagation approach is inappropriate in some cases. In these cases, likewise also the error estimates have to be obtained with a more sophisticated approach. Uncertainties of RBE, visualized by error bars, are of importance for treatment planning and also for setting up a precision goal for predicting biophysical models such as the local effect model.
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125
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Durante M, Reitz G, Angerer O. Space radiation research in Europe: flight experiments and ground-based studies. RADIATION AND ENVIRONMENTAL BIOPHYSICS 2010; 49:295-302. [PMID: 20532544 DOI: 10.1007/s00411-010-0300-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2009] [Accepted: 05/22/2010] [Indexed: 05/29/2023]
Abstract
Exposure to space radiation has long been acknowledged as a potential showstopper for long-duration manned interplanetary missions. In an effort to gain more information on space radiation risk and to develop countermeasures, NASA initiated several years ago a Space Radiation Health Program, which is currently supporting biological experiments performed at the Brookhaven National Laboratory. Accelerator-based radiobiology research in the field of space radiation research is also under way in Russia and Japan. The European Space Agency (ESA) supports research in the field in three main directions: spaceflight experiments on the International Space Station; modeling and simulations of the space radiation environment and transport; and, recently, ground-based radiobiology experiments exploiting the high-energy SIS18 synchrotron at GSI in Germany (IBER program). Several experiments are currently under way within IBER, and so far, beams of C and Fe-ions at energies between 11 and 1,000 MeV/n have been used in cell and tissue targets.
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126
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Pignalosa D, Ritter S, Durante M. Inversions in Chromosome 10 of Human Thyroid Cells Induced by Accelerated Heavy Ions. Radiat Res 2010; 174:14-9. [DOI: 10.1667/rr1963.1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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127
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Durante M, Pignalosa D, Jansen JA, Walboomers XF, Ritter S. Influence of Nuclear Geometry on the Formation of Genetic Rearrangements in Human Cells. Radiat Res 2010; 174:20-6. [DOI: 10.1667/rr2063.1] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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128
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Steidl P, Richter D, Schuy C, Saito N, Naumann J, Brons S, Panse R, Haberer T, Durante M, Bert C. SU-GG-T-448: Beam Parameters for Gated Irradiations of Moving Targets in Scanned Particle Therapy. Med Phys 2010. [DOI: 10.1118/1.3468846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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129
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Martino G, Durante M, Schardt D. Microdosimetry measurements characterizing the radiation fields of 300 MeV/u12C and 185 MeV/u7Li pencil beams stopping in water. Phys Med Biol 2010; 55:3441-9. [DOI: 10.1088/0031-9155/55/12/011] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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130
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Gemmel A, Bert C, Saito N, von Neubeck C, Iancu G, K-Weyrather W, Durante M, Rietzel E. Development and performance evaluation of a dynamic phantom for biological dosimetry of moving targets. Phys Med Biol 2010; 55:2997-3009. [PMID: 20442464 DOI: 10.1088/0031-9155/55/11/001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A dynamic phantom has been developed to allow for measurement of 3D cell survival distributions and the corresponding distributions of the RBE-weighted dose (RBED) in the presence of motion. The phantom consists of two 96-microwell plates holding Chinese hamster ovary cells inside a container filled with culture medium and is placed on a movable stage. Basic biological properties of the phantom were investigated without irradiation and after irradiation with a carbon ion beam, using both a stationary (reference) exposure and exposure during motion of the phantom perpendicular to the beam with beam tracking. There was no statistically significant difference between plating efficiency measured in the microwells with and without motion (0.75) and values reported in the literature. Mean differences between measured and calculated cell survival for these two irradiation modes were within +/-5% of the target dose of 6 Gy (RBE).
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131
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Johnston S, Trudeau M, Rubin S, Little S, Heise M, Durante M, Salazar V, Richie M, Cristofanilli M. 380 A novel skin assessment tool for inflammatory breast cancer (IBC). EJC Suppl 2010. [DOI: 10.1016/s1359-6349(10)70406-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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132
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Splinter J, Jakob B, Lang M, Yano K, Engelhardt J, Hell SW, Chen DJ, Durante M, Taucher-Scholz G. Biological dose estimation of UVA laser microirradiation utilizing charged particle-induced protein foci. Mutagenesis 2010; 25:289-97. [PMID: 20167590 DOI: 10.1093/mutage/geq005] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The induction of localized DNA damage within a discrete nuclear volume is an important tool in DNA repair studies. Both charged particle irradiation and laser microirradiation (LMI) systems allow for such a localized damage induction, but the results obtained are difficult to compare, as the delivered laser dose cannot be measured directly. Therefore, we revisited the idea of a biological dosimetry based on the microscopic evaluation of irradiation-induced Replication Protein A (RPA) foci numbers. Considering that local dose deposition is characteristic for both LMI and charged particles, we took advantage of the defined dosimetry of particle irradiation to estimate the locally applied laser dose equivalent. Within the irradiated nuclear sub-volumes, the doses were in the range of several hundreds of Gray. However, local dose estimation is limited by the saturation of the RPA foci numbers with increasing particle doses. Even high-resolution 4Pi microscopy did not abrogate saturation as it was not able to resolve single lesions within individual RPA foci. Nevertheless, 4Pi microscopy revealed multiple and distinct 53BP1- and gamma H2AX-stained substructures within the lesion flanking chromatin domains. Monitoring the local recruitment of the telomere repeat-binding factors TRF1 and TRF2 showed that both proteins accumulated at damage sites after UVA-LMI but not after densely ionizing charged particle irradiation. Hence, our results indicate that the local dose delivered by UVA-LMI is extremely high and cannot be accurately translated into an equivalent ionizing radiation dose, despite the sophisticated techniques used in this study.
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133
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Obe G, Durante M. DNA Double Strand Breaks and Chromosomal Aberrations. Cytogenet Genome Res 2010; 128:8-16. [DOI: 10.1159/000303328] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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134
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Coppola F, Durante M, Gialanella G, Grossi G, Manti L, Pugliese M, Scampoli P. Development of an automated scanning system for the analysis of heavy ions' fragmentation reaction by nuclear track detectors. RADIAT MEAS 2009. [DOI: 10.1016/j.radmeas.2009.10.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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135
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Napolitano M, Durante M, Grossi GF, Pugliese M, Gialanella G. Inactivation of C3H 10T½ Cells by Monoenergetic High LET Alpha-particles. Int J Radiat Biol 2009; 61:813-20. [PMID: 1351532 DOI: 10.1080/09553009214551691] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Inactivation of mouse C3H 10T1/2 cells in plateau-phase (7.8 x 10(4) cells/cm2) was studied by using alpha-particles from the irradiation facility installed for radiobiological experiments at the 3 MV Tandem accelerator, University of Naples. Silicon detectors and CR39 plastic track detectors were employed for dosimetric purposes. The cells were exposed to high LET monoenergetic alpha-particles (energy of 1.8 MeV at the centre of the cell nucleus, track-averaged LET of 177 keV/micron and dose-rate of 1.1 Gy/min) and low-LET 80 kVp X-rays. The X-ray survival curve showed a significant shoulder (alpha/beta = 9 Gy) while the survival curve for alpha-particles was close to exponential. The mean lethal dose of alpha-particles was 0.77 +/- 0.02 Gy and the RBE was 5.2 at 80% survival and 3.0 at 5% survival. Survival of exponentially growing cells (2 x 10(4) cells/cm2) following irradiation with the alpha-particle beam is also reported. The nuclear areas of 10T1/2 cells were measured as 299 +/- 9 micron 2 and 250 +/- 8 micron 2 for cells in log phase and plateau phase, respectively. The inactivation cross-section, obtained from the mean lethal dose, was 34 micron 2 and 37 micron 2 for cells in log phase and plateau phase, respectively. These values appear to be the maximum measured values for the inactivation cross-section of 10T1/2 cells as a function of the alpha-particle LET. This saturation cross-section is very similar to the saturation values reported in the literature for other mammalian cell lines.
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Durante M, Grossi GF, Napolitano M, Pugliese M, Gialanella G. Chromosome Damage Induced by High-LET α-particles in Plateau-phase C3H 10T1/2 Cells. Int J Radiat Biol 2009; 62:571-80. [PMID: 1361514 DOI: 10.1080/09553009214552491] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Chromosome aberrations induced by X-rays and alpha-particles (LET = 177 keV/microns) were observed at the first mitosis in C3H 10T1/2 cells released from density-inhibited cultures. X-radiation induced more chromosome exchanges than breaks (71% vs 27% of total aberrations), while a predominance of breaks (63%) was observed after alpha-irradiation. A linear-quadratic dose-response relationship was obtained for X-rays, while that for alpha-particles was linear. The RBE values for total aberration induction (ranging from 5.1 at low doses to 4.4 at high doses) were very similar to the RBE for cell killing (from 5.2 to 4.3). The RBE for dicentric induction (approximately 2) was much lower than the RBE for the induction of both breaks (from 7 to 6) and interstitial deletions (from 9 to 7). This behaviour supports the hypothesis that chromosome deletions play a major role in the malignant transformation of 10T1/2 cells. A high correlation between cell killing and number of acentric fragments per cell was found. The number of acentrics/cell at the mean lethal dose was about 1.4. This number was reduced to 1.0 when asymmetrical interchanges, which generally result in very small deletions, were subtracted from acentrics. It could be hypothesized that very small deletions could not impair cell survival. However, an alternative hypothesis related to the aneuploid state of C3H 10T1/2 cells can be formulated. Robertsonian translocations were also observed at the first mitosis. The dose-response curve of these translocations appears to be very similar to the dose-response curve for induction of sister chromatid exchanges (observed at the second mitosis) reported by other authors studying the same cell line. This similarity could indicate a general mechanism of action of radiation on the process of recombination of genetic material.
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Lima-de-Faria A, Pero R, Avanzi S, Durante M, Ståhle U, D'Amato F, Granström H. Relation between ribosomal RNA genes and the DNA satellites of Phaseolus coccineus. Hereditas 2009; 79:5-20. [PMID: 1165210 DOI: 10.1111/j.1601-5223.1975.tb01457.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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Pignalosa D, Bertucci A, Gialanella G, Grossi G, Manti L, Pugliese M, Scampoli P, Durante M. Chromosome Inter- and Intrachanges Detected by Arm-Specific DNA Probes in the Progeny of Human Lymphocytes Exposed to Energetic Heavy Ions. Radiat Res 2008; 170:458-66. [DOI: 10.1667/rr1326.1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Macchi M, Durante M, Bernardi R, Traina G. Ribosomal RNA characterization in the leech Hirudo medicinalis. Arch Ital Biol 2008; 146:205-208. [PMID: 19378882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In the present study the ribosomal RNA of the leech Hirudo medicinalis has been characterized at the aim of identifying possible analogies with other invertebrates. Upon electrophoresis on denaturating gels, ribosomal RNA fraction of H. medicinalis exhibited a remarkable thermal instability by dissociating into two hydrogen-bonded components when heated at 60 degrees C, at variance with the behaviour of the rat rRNA, which does not show this process. This result suggests a functional role in leech ribosome organisation that requires deeper structural studies.
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Salvini M, Boccardi TM, Sani E, Bernardi R, Tozzi S, Pugliesi C, Durante M. Alpha-tryptophan synthase of Isatis tinctoria: gene cloning and expression. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2008; 46:715-723. [PMID: 18514538 DOI: 10.1016/j.plaphy.2008.04.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2008] [Indexed: 05/03/2023]
Abstract
Indole producing reaction is a crux in the regulation of metabolite flow through the pathways and the coordination of primary and secondary product biosynthesis in plants. Indole is yielded transiently from indole-3-glycerol phosphate and immediately condensed with serine to give tryptophan, by the enzyme tryptophan synthase (TS). There is evidence that plant TS, like the bacterial complex, functions as an alpha beta heteromer. In few species, e.g. maize, are known enzymes, related with the TS alpha-subunit (TSA), able to catalyse reaction producing indole, which is free to enter the secondary metabolite pathways. In this contest, we searched for TSA and TSA related genes in Isatis tinctoria, a species producing the natural blue dye indigo. The It-TSA cDNA and the full-length exons/introns genomic region were isolated. The phylogenetic analysis indicates that It-TSA is more closely related to Arabidopsis thaliana At-T14E10.210 TSA (95.7% identity at the amino acid level) with respect to A. thaliana At-T10P11.11 TSA1-like (63%), Zea mays indole-3-glycerol phosphate lyase (54%), Z. mays TSA (53%), and Z. mays indole synthase (50%). The It-TSA cDNA was also able to complement an Escherichia coli trpA mutant. To examine the involvement of It-TSA in the biosynthesis of secondary metabolism compounds, It-TSA expression was tested in seedling grown under different light conditions. Semi-quantitative RT-PCR showed an increase in the steady-state level of It-TSA mRNA, paralleled by an increase of indigo and its precursor isatan B. Our results appear to indicate an involvement for It-TSA in indigo precursor synthesis and/or tryptophan biosynthesis.
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Bartolini G, Petruccelli R, Pestelli P, Bernardi R, Durante M. PRELIMINARY STUDY ON IN VIVO ROOTING OF TWO OLEA EUROPAEA L. GENOTYPES. ACTA ACUST UNITED AC 2008. [DOI: 10.17660/actahortic.2008.791.26] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Lobascio C, Briccarello M, Destefanis R, Faraud M, Gialanella G, Grossi G, Guarnieri V, Manti L, Pugliese M, Rusek A, Scampoli P, Durante M. Accelerator-based tests of radiation shielding properties of materials used in human space infrastructures. HEALTH PHYSICS 2008; 94:242-247. [PMID: 18301097 DOI: 10.1097/01.hp.0000288560.21906.4e] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Shielding is the only practical countermeasure for the exposure to cosmic radiation during space travel. It is well known that light, hydrogenated materials, such as water and polyethylene, provide the best shielding against space radiation. Kevlar and Nextel are two materials of great interest for spacecraft shielding because of their known ability to protect human space infrastructures from meteoroids and debris. We measured the response to simulated heavy-ion cosmic radiation of these shielding materials and compared it to polyethylene, Lucite (PMMA), and aluminum. As proxy to galactic nuclei we used 1 GeV n iron or titanium ions. Both physics and biology tests were performed. The results show that Kevlar, which is rich in carbon atoms (about 50% in number), is an excellent space radiation shielding material. Physics tests show that its effectiveness is close (80-90%) to that of polyethylene, and biology data suggest that it can reduce the chromosomal damage more efficiently than PMMA. Nextel is less efficient as a radiation shield, and the expected reduction on dose is roughly half that provided by the same mass of polyethylene. Both Kevlar and Nextel are more effective than aluminum in the attenuation of heavy-ion dose.
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Lenucci M, Caccioppola A, Durante M, Serrone L, Piro G, Dalessandro G. CAROTENOIDS CONTENT IN RIPE RAW AND PROCESSED (SAUCE) BERRIES OF HIGH PIGMENT TOMATO HYBRIDS. ACTA ACUST UNITED AC 2007. [DOI: 10.17660/actahortic.2007.758.19] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Bertucci A, Durante M, Gialanella G, Grossi G, Manti L, Pugliese M, Scampoli P, Mancusi D, Sihver L, Rusek A. Shielding of relativistic protons. RADIATION AND ENVIRONMENTAL BIOPHYSICS 2007; 46:107-11. [PMID: 17256178 DOI: 10.1007/s00411-006-0088-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2006] [Accepted: 12/19/2006] [Indexed: 05/13/2023]
Abstract
Protons are the most abundant element in the galactic cosmic radiation, and the energy spectrum peaks around 1 GeV. Shielding of relativistic protons is therefore a key problem in the radiation protection strategy of crewmembers involved in long-term missions in deep space. Hydrogen ions were accelerated up to 1 GeV at the NASA Space Radiation Laboratory, Brookhaven National Laboratory, New York. The proton beam was also shielded with thick (about 20 g/cm2) blocks of lucite (PMMA) or aluminium (Al). We found that the dose rate was increased 40-60% by the shielding and decreased as a function of the distance along the axis. Simulations using the General-Purpose Particle and Heavy-Ion Transport code System (PHITS) show that the dose increase is mostly caused by secondary protons emitted by the target. The modified radiation field after the shield has been characterized for its biological effectiveness by measuring chromosomal aberrations in human peripheral blood lymphocytes exposed just behind the shield block, or to the direct beam, in the dose range 0.5-3 Gy. Notwithstanding the increased dose per incident proton, the fraction of aberrant cells at the same dose in the sample position was not significantly modified by the shield. The PHITS code simulations show that, albeit secondary protons are slower than incident nuclei, the LET spectrum is still contained in the low-LET range (<10 keV/microm), which explains the approximately unitary value measured for the relative biological effectiveness.
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Spillantini P, Casolino M, Durante M, Mueller-Mellin R, Reitz G, Rossi L, Shurshakov V, Sorbi M. Shielding from cosmic radiation for interplanetary missions: Active and passive methods. RADIAT MEAS 2007. [DOI: 10.1016/j.radmeas.2006.04.028] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Durante M, George K, Cucinotta FA. Chromosomes Lacking Telomeres are Present in the Progeny of Human Lymphocytes Exposed to Heavy Ions. Radiat Res 2006; 165:51-8. [PMID: 16392962 DOI: 10.1667/rr3477.1] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
High-charge and energy (HZE) nuclei represent one of the main health risks for human space exploration, yet little is known about the mechanisms responsible for the high biological effectiveness of these particles. We have used in situ hybridization probes for cross-species multicolor banding (RxFISH) in combination with telomere detection to compare yields of different types of chromosomal aberrations in the progeny of human peripheral blood lymphocytes exposed to either high-energy iron ions or gamma rays. Terminal deletions showed the greatest relative variation, with many more of these types of aberrations induced after exposure to accelerated iron ions (energy 1 GeV/nucleon) compared with the same dose of gamma rays. We found that truncated chromosomes without telomeres could be transmitted for at least three cell cycles after exposure and represented about 10% of all aberrations observed in the progeny of cells exposed to iron ions. On the other hand, the fraction of cells carrying stable, transmissible chromosomal aberrations was similar in the progeny of cells exposed to the same dose of densely or sparsely ionizing radiation. The results demonstrate that unrejoined chromosome breaks are an important component of aberration spectra produced by the exposure to HZE nuclei. This finding may well be related to the ability of such energetic particles to produce untoward late effects in irradiated organisms.
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Horstmann M, Durante M, Johannes C, Pieper R, Obe G. Space radiation does not induce a significant increase of intrachromosomal exchanges in astronauts' lymphocytes. RADIATION AND ENVIRONMENTAL BIOPHYSICS 2005; 44:219-24. [PMID: 16217644 DOI: 10.1007/s00411-005-0017-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2005] [Accepted: 09/20/2005] [Indexed: 05/04/2023]
Abstract
Chromosome aberration analysis in astronauts has been used to provide direct, biologically motivated estimates of equivalent doses and risk associated to cosmic radiation exposure during space flight. However, the past studies concentrated on measurements of dicentrics and translocations, while chromosome intrachanges (inversions) have never been measured in astronauts' samples. Recent data reported in the literature suggest that densely ionizing radiation can induce a large fraction of intrachanges, thus leading to the suspicion that interchanges grossly underestimate the cosmic radiation-induced cytogenetic damage in astronauts. We have analyzed peripheral blood lymphocytes from 11 astronauts involved in short- or long-term space flights in low-Earth orbit using high-resolution multicolor banding to assess the frequency of intrachromosomal exchanges in both pre- and post-flight samples. We did not detect any inversions in chromosome 5 from a total of 2800 cells in astronauts' blood. In addition, no complex type exchanges were found in a total of 3590 astronauts' lymphocytes analyzed by multifluor fluorescence in situ hybridisation. We conclude that, within the statistical power of this study, the analysis of interchanges for biological dosimetry in astronauts does not significantly underestimate the space radiation-induced cytogenetic damage, and complex-type exchanges or intrachanges have limited practical use for biodosimetry at very low doses.
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Durante M, George K, Gialanella G, Grossi G, La Tessa C, Manti L, Miller J, Pugliese M, Scampoli P, Cucinotta FA. Cytogenetic effects of high-energy iron ions: dependence on shielding thickness and material. Radiat Res 2005; 164:571-6. [PMID: 16187790 DOI: 10.1667/rr3362.1] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
We report results for chromosomal aberrations in human peripheral blood lymphocytes after they were exposed to high-energy iron ions with or without shielding at the HIMAC, AGS and NSRL accelerators. Isolated lymphocytes were exposed to iron ions with energies between 200 and 5000 MeV/nucleon in the 0.1-1-Gy dose range. Shielding materials consisted of polyethylene, lucite (PMMA), carbon, aluminum and lead, with mass thickness ranging from 2 to 30 g/cm2. After exposure, lymphocytes were stimulated to grow in vitro, and chromosomes were prematurely condensed using a phosphatase inhibitor (calyculin A). Aberrations were scored using FISH painting. The yield of total interchromosomal exchanges (including dicentrics, translocations and complex rearrangements) increased linearly with dose or fluence in the range studied. Shielding decreased the effectiveness per unit dose of iron ions. The highest RBE value was measured with the 1 GeV/nucleon iron-ion beam at NSRL. However, the RBE for the induction of aberrations apparently is not well correlated with the mean LET. When shielding thickness was increased, the frequency of aberrations per particle incident on the shield increased for the 500 MeV/nucleon ions and decreased for the 1 GeV/nucleon ions. Maximum variation at equal mass thickness was obtained with light materials (polyethylene, carbon or PMMA). Variations in the yield of chromosomal aberrations per iron particle incident on the shield follow variations in the dose per incident particle behind the shield but can be modified by the different RBE of the mixed radiation field produced by nuclear fragmentation. The results suggest that shielding design models should be benchmarked using both physics and biological data.
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Desai N, Davis E, O'Neill P, Durante M, Cucinotta FA, Wu H. Immunofluorescence detection of clustered gamma-H2AX foci induced by HZE-particle radiation. Radiat Res 2005; 164:518-22. [PMID: 16187760 DOI: 10.1667/rr3431.1] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
We studied the spatial and temporal distributions of foci of the phosphorylated form of the histone protein H2AX (gamma-H2AX), which is known to be activated by double-strand breaks after irradiation of human fibroblast cells with high-energy silicon (54 keV/microm) and iron (176 keV/microm) ions. Here we present data obtained with the ion path parallel to a monolayer of human fibroblast cells that leads to gamma-H2AX aggregates in the shape of streaks stretching over several micrometers in an x/y plane, thus enabling the analysis of the fluorescence distributions along the ion trajectories. Qualitative analyses of these distributions provide insights into DNA damage processing kinetics for high charge and energy (HZE) ions, including evidence of increased clustering of DNA damage and slower processing with increasing LET.
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