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Low-Dose Radiation Therapy (LDRT) against Cancer and Inflammatory or Degenerative Diseases: Three Parallel Stories with a Common Molecular Mechanism Involving the Nucleoshuttling of the ATM Protein? Cancers (Basel) 2023; 15:cancers15051482. [PMID: 36900274 PMCID: PMC10000719 DOI: 10.3390/cancers15051482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 02/18/2023] [Accepted: 02/23/2023] [Indexed: 03/02/2023] Open
Abstract
Very early after their discovery, X-rays were used in multiple medical applications, such as treatments against cancer, inflammation and pain. Because of technological constraints, such applications involved X-ray doses lower than 1 Gy per session. Progressively, notably in oncology, the dose per session increased. However, the approach of delivering less than 1 Gy per session, now called low-dose radiation therapy (LDRT), was preserved and is still applied in very specific cases. More recently, LDRT has also been applied in some trials to protect against lung inflammation after COVID-19 infection or to treat degenerative syndromes such as Alzheimer's disease. LDRT illustrates well the discontinuity of the dose-response curve and the counterintuitive observation that a low dose may produce a biological effect higher than a certain higher dose. Even if further investigations are needed to document and optimize LDRT, the apparent paradox of some radiobiological effects specific to low dose may be explained by the same mechanistic model based on the radiation-induced nucleoshuttling of the ATM kinase, a protein involved in various stress response pathways.
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2
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Mathur A, Chinnadurai V, Bhalla PJS, Chandna S. Induction of epithelial-mesenchymal transition in thyroid follicular cells is associated with cell adhesion alterations and low-dose hyper-radiosensitivity. Tumour Biol 2023; 45:95-110. [PMID: 37742670 DOI: 10.3233/tub-220027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/26/2023] Open
Abstract
BACKGROUND Epithelial-mesenchymal transition (EMT) is associated with altered cellular adhesion. We previously demonstrated that cellular adhesion influences Low-dose Hyper-Radiosensitivity (HRS) in a variety of tumor cells. However, the relationship of low-dose HRS with the phenotypic plasticity incurred by EMT during the neoplastic transformation remains to be elucidated. OBJECTIVE To investigate whether acquisition of EMT phenotype during progressive neoplastic transformation may affect low-dose radiation sensitivity. METHODS Primary thyroid cells obtained from a human cystic thyroid nodule were first subjected to nutritional stress. This yielded immortalized INM-Thy1 cell strain, which was further treated with either multiple γ-radiation fractions (1.5 Gy each) or repetitive cycles of 3-methylcholanthrene and phorbol-12-myristate-13-acetate, yielding two progressive transformants, viz., INM-Thy1R and INM-Thy1C. Morphological alterations, chromosomal double-minutes, cell adhesion proteins, anchorage dependency, tumorigenicity in nude mice and cellular radiosensitivity were studied in these strains. RESULTS Both transformants (INM-Thy1R, INM-Thy1C) displayed progressive tumorigenic features, viz., soft agar colony growth and solid tumor growth in nude mice, coupled with features of epithelial-mesenchymal transition and activated Wnt pathway. Incidentally, the chemical-induced transformant (INM-Thy1C) displayed a prominent HRS (αs/αr = 29.35) which remained unaffected at high cell density. However, the parental (INM-Thy1) cell line as well as radiation-induced transformant (INM-Thy1R) failed to show this hypersensitivity. CONCLUSION The study shows that induction of EMT in thyroid follicular cells may accompany increased susceptibility to low-dose ionizing radiation, which was attenuated by adaptive resistance acquired during radiation-induced transformation.
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Affiliation(s)
- Ankit Mathur
- Division of Radiation Biosciences, Institute of Nuclear Medicine and Allied Sciences, Brig. S.K. Mazumdar Road, Timarpur, Delhi, India
| | - Vijayakumar Chinnadurai
- Institute of Nuclear Medicine and Allied Sciences, Brig. S.K. Mazumdar Road, Timarpur, Delhi, India
| | - Param Jit Singh Bhalla
- Institute of Nuclear Medicine and Allied Sciences, Brig. S.K. Mazumdar Road, Timarpur, Delhi, India
| | - Sudhir Chandna
- Division of Radiation Biosciences, Institute of Nuclear Medicine and Allied Sciences, Brig. S.K. Mazumdar Road, Timarpur, Delhi, India
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Almahwasi A. Low dose hyper-radiosensitivity in normal human cells. Radiat Phys Chem Oxf Engl 1993 2023. [DOI: 10.1016/j.radphyschem.2022.110523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Polgár S, Schofield PN, Madas BG. Datasets of in vitro clonogenic assays showing low dose hyper-radiosensitivity and induced radioresistance. Sci Data 2022; 9:555. [PMID: 36075916 PMCID: PMC9458642 DOI: 10.1038/s41597-022-01653-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Accepted: 08/19/2022] [Indexed: 11/19/2022] Open
Abstract
Low dose hyper-radiosensitivity and induced radioresistance are primarily observed in surviving fractions of cell populations exposed to ionizing radiation, plotted as the function of absorbed dose. Several biophysical models have been developed to quantitatively describe these phenomena. However, there is a lack of raw, openly available experimental data to support the development and validation of quantitative models. The aim of this study was to set up a database of experimental data from the public literature. Using Google Scholar search, 46 publications with 101 datasets on the dose-dependence of surviving fractions, with clear evidence of low dose hyper-radiosensitivity, were identified. Surviving fractions, their uncertainties, and the corresponding absorbed doses were digitized from graphs of the publications. The characteristics of the cell line and the irradiation were also recorded, along with the parameters of the linear-quadratic model and/or the induced repair model if they were provided. The database is available in STOREDB, and can be used for meta-analysis, for comparison with new experiments, and for development and validation of biophysical models. Measurement(s) | surviving fraction of cells | Technology Type(s) | optical microscopy | Factor Type(s) | absorbed dose | Sample Characteristic - Organism | Homo sapiens • Chinese hamster • Rattus sp. | Sample Characteristic - Environment | cell culture |
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Affiliation(s)
- Szabolcs Polgár
- Doctoral School of Physics, ELTE Eötvös Loránd University, Budapest, Hungary.,Environmental Physics Department, Centre for Energy Research, Budapest, Hungary
| | - Paul N Schofield
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, United Kingdom
| | - Balázs G Madas
- Environmental Physics Department, Centre for Energy Research, Budapest, Hungary. .,Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, Budapest, Hungary.
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Stouten S, Balkenende B, Roobol L, Lunel SV, Badie C, Dekkers F. Hyper-radiosensitivity affects low-dose acute myeloid leukemia incidence in a mathematical model. RADIATION AND ENVIRONMENTAL BIOPHYSICS 2022; 61:361-373. [PMID: 35864346 PMCID: PMC9334435 DOI: 10.1007/s00411-022-00981-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 06/11/2022] [Indexed: 06/15/2023]
Abstract
In vitro experiments show that the cells possibly responsible for radiation-induced acute myeloid leukemia (rAML) exhibit low-dose hyper-radiosensitivity (HRS). In these cells, HRS is responsible for excess cell killing at low doses. Besides the endpoint of cell killing, HRS has also been shown to stimulate the low-dose formation of chromosomal aberrations such as deletions. Although HRS has been investigated extensively, little is known about the possible effect of HRS on low-dose cancer risk. In CBA mice, rAML can largely be explained in terms of a radiation-induced Sfpi1 deletion and a point mutation in the remaining Sfpi1 gene copy. The aim of this paper is to present and quantify possible mechanisms through which HRS may influence low-dose rAML incidence in CBA mice. To accomplish this, a mechanistic rAML CBA mouse model was developed to study HRS-dependent AML onset after low-dose photon irradiation. The rAML incidence was computed under the assumptions that target cells: (1) do not exhibit HRS; (2) HRS only stimulates cell killing; or (3) HRS stimulates cell killing and the formation of the Sfpi1 deletion. In absence of HRS (control), the rAML dose-response curve can be approximated with a linear-quadratic function of the absorbed dose. Compared to the control, the assumption that HRS stimulates cell killing lowered the rAML incidence, whereas increased incidence was observed at low doses if HRS additionally stimulates the induction of the Sfpi1 deletion. In conclusion, cellular HRS affects the number of surviving pre-leukemic cells with an Sfpi1 deletion which, depending on the HRS assumption, directly translates to a lower/higher probability of developing rAML. Low-dose HRS may affect cancer risk in general by altering the probability that certain mutations occur/persist.
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Affiliation(s)
- Sjors Stouten
- Center for Environmental Safety and Security, National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands
- Department of Mathematics, Utrecht University, Utrecht, The Netherlands
| | - Ben Balkenende
- Department of Mathematics, Utrecht University, Utrecht, The Netherlands
| | - Lars Roobol
- Center for Environmental Safety and Security, National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands
| | | | - Christophe Badie
- Cancer Mechanisms and Biomarkers group, Radiation Effects Department, Radiation, Chemical and Environmental Hazards, UK Health Security Agency, Chilton, Didcot, Oxon, OX11 0RQ UK
| | - Fieke Dekkers
- Center for Environmental Safety and Security, National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands
- Department of Mathematics, Utrecht University, Utrecht, The Netherlands
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6
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Scirocco E, Cellini F, Zamagni A, Macchia G, Deodato F, Cilla S, Strigari L, Buwenge M, Rizzo S, Cammelli S, Morganti AG. Clinical Studies on Ultrafractionated Chemoradiation: A Systematic Review. Front Oncol 2021; 11:748200. [PMID: 34868948 PMCID: PMC8635188 DOI: 10.3389/fonc.2021.748200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 10/25/2021] [Indexed: 01/08/2023] Open
Abstract
Aim The efficacy of low-dose fractionated radiotherapy (LDFRT) and chemotherapy (CHT) combination has large preclinical but little clinical evidence. Therefore, the aim of this review was to collect and analyze the clinical results of LDRT plus concurrent CHT in patients with advanced cancers. Methods A systematic literature search was conducted on PubMed using the PRISMA methodology. Only studies based on the combination of LDFRT (< 1 Gy/fraction) and CHT were included. Endpoints of the analysis were tumor response, toxicity, and overall survival, with particular focus on any differences between LDFRT-CHT and CHT alone. Results Twelve studies (307 patients) fulfilled the selection criteria and were included in this review. Two studies were retrospective, one was a prospective pilot trial, six were phase II studies, two were phase I trials, and one was a phase I/II open label study. No randomized controlled trials were found. Seven out of eight studies comparing clinical response showed higher rates after LDFRT-CHT compared to CHT alone. Three out of four studies comparing survival reported improved results after combined treatment. Three studies compared toxicity of CHT and LDFRT plus CHT, and all of them reported similar adverse events rates. In most cases, toxicity was manageable with only three likely LDFRT-unrelated fatal events (1%), all recorded in the same series on LDFRT plus temozolomide in glioblastoma multiforme patients. Conclusion None of the analyzed studies provided level I evidence on the clinical impact of LDFRT plus CHT. However, it should be noted that, apart from two small series of breast cancers, all studies reported improved therapeutic outcomes and similar tolerability compared to CHT alone. Systematic Review Registration www.crd.york.ac.uk/prospero/, identifier CRD42020206639.
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Affiliation(s)
- Erica Scirocco
- Radiation Oncology, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.,Department of Experimental, Diagnostic and Specialty Medicine-Alma Mater Studiorum Bologna University, Bologna, Italy
| | - Francesco Cellini
- Università Cattolica del Sacro Cuore, Dipartimento Universitario Diagnostica per immagini, Radioterapia Oncologica ed Ematologia, Roma, Italy.,Fondazione Policlinico Universitario "A. Gemelli" Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Dipartimento di Diagnostica per Immagini, Radioterapia Oncologica ed Ematologia, Roma, Italy
| | - Alice Zamagni
- Radiation Oncology, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.,Department of Experimental, Diagnostic and Specialty Medicine-Alma Mater Studiorum Bologna University, Bologna, Italy
| | - Gabriella Macchia
- Radiotherapy Unit, Gemelli Molise Hospital, Catholic University of Sacred Heart, Campobasso, Italy
| | - Francesco Deodato
- Radiotherapy Unit, Gemelli Molise Hospital, Catholic University of Sacred Heart, Campobasso, Italy
| | - Savino Cilla
- Medical Physic Unit, Gemelli Molise Hospital, Catholic University of Sacred Heart, Campobasso, Italy
| | - Lidia Strigari
- Medical Physics Unit, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Milly Buwenge
- Department of Experimental, Diagnostic and Specialty Medicine-Alma Mater Studiorum Bologna University, Bologna, Italy
| | - Stefania Rizzo
- Service of Radiology, Imaging Institute of Southern Switzerland, Ente Ospedaliero Cantonale (EOC), Lugano, Switzerland
| | - Silvia Cammelli
- Radiation Oncology, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.,Department of Experimental, Diagnostic and Specialty Medicine-Alma Mater Studiorum Bologna University, Bologna, Italy
| | - Alessio Giuseppe Morganti
- Radiation Oncology, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.,Department of Experimental, Diagnostic and Specialty Medicine-Alma Mater Studiorum Bologna University, Bologna, Italy
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Prabhu AV, Lee M, Galhardo E, Newkirk M, Rodriguez A, Xia F. Pulsed reduced dose-rate radiotherapy for previously irradiated tumors in the brain and spine. Surg Neurol Int 2021; 12:280. [PMID: 34221611 PMCID: PMC8247706 DOI: 10.25259/sni_589_2020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Accepted: 04/27/2021] [Indexed: 11/21/2022] Open
Abstract
Background: Patients with unresectable locoregional cancer recurrences have limited management options. Reirradiation increases the risk of toxicity, particularly when perilesional dose-volume constraints are exceeded. We present and discuss two cases of previously irradiated tumors in the central nervous system (CNS) that was reirradiated using the pulsed reduced dose-rate radiotherapy (PRDR) technique. Case Description: A 58-year-old female with a history of metastatic small cell lung cancer to the brain status post multiple rounds of radiation and chemotherapy presented with increasing weakness in her right arm and leg. Magnetic resonance imaging (MRI) revealed a growly peripherally enhancing 1.2 cm mass in the left precentral gyrus that had previously received prophylactic cranial irradiation and stereotactic radiosurgery. The patient was re-irradiated with 35 Gy in 100 fractions over 3 weeks, using PRDR with improved motor function at 3-month follow-up. A 41-year-old male with recurrent glioblastoma of the thoracic spinal cord presented with worsening neurological symptoms, including inability to ambulate due to bilateral leg weakness, causing wheelchair use. MRI thoracic spine revealed a recurrent thoracic lesion 2.2 × 1 × 0.8 cm. In addition to chronic chemotherapy, the patient was retreated palliatively in the same area at 50 Gy in 250 fractions, over 6 weeks, using PRDR. The treated lesion was stable on follow-up imaging, and the patient was able to walk with the assistance of a walker. Conclusion: In our two cases, PRDR proved effective in the treatment of recurrent malignant CNS tumors that were previously irradiated. Prospective studies are needed to delineate the efficacy and toxicity of PRDR.
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Affiliation(s)
- Arpan V Prabhu
- Department of Radiation Oncology University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States
| | - Madison Lee
- Department of Neurological Surgery, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States
| | - Edvaldo Galhardo
- Department of Radiation Oncology University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States
| | - Madison Newkirk
- Department of Radiation Oncology University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States
| | - Analiz Rodriguez
- Department of Neurological Surgery, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States
| | - Fen Xia
- Department of Radiation Oncology University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States
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8
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Restier-Verlet J, El-Nachef L, Ferlazzo ML, Al-Choboq J, Granzotto A, Bouchet A, Foray N. Radiation on Earth or in Space: What Does It Change? Int J Mol Sci 2021; 22:3739. [PMID: 33916740 PMCID: PMC8038356 DOI: 10.3390/ijms22073739] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 03/28/2021] [Accepted: 03/29/2021] [Indexed: 12/15/2022] Open
Abstract
After having been an instrument of the Cold War, space exploration has become a major technological, scientific and societal challenge for a number of countries. With new projects to return to the Moon and go to Mars, radiobiologists have been called upon to better assess the risks linked to exposure to radiation emitted from space (IRS), one of the major hazards for astronauts. To this aim, a major task is to identify the specificities of the different sources of IRS that concern astronauts. By considering the probabilities of the impact of IRS against spacecraft shielding, three conclusions can be drawn: (1) The impacts of heavy ions are rare and their contribution to radiation dose may be low during low Earth orbit; (2) secondary particles, including neutrons emitted at low energy from the spacecraft shielding, may be common in deep space and may preferentially target surface tissues such as the eyes and skin; (3) a "bath of radiation" composed of residual rays and fast neutrons inside the spacecraft may present a concern for deep tissues such as bones and the cardiovascular system. Hence, skin melanoma, cataracts, loss of bone mass, and aging of the cardiovascular system are possible, dependent on the dose, dose-rate, and individual factors. This suggests that both radiosusceptibility and radiodegeneration may be concerns related to space exploration. In addition, in the particular case of extreme solar events, radiosensitivity reactions-such as those observed in acute radiation syndrome-may occur and affect blood composition, gastrointestinal and neurologic systems. This review summarizes the specificities of space radiobiology and opens the debate as regards refinements of current radiation protection concepts that will be useful for the better estimation of risks.
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Affiliation(s)
| | | | | | | | | | | | - Nicolas Foray
- Inserm, U1296 Unit, «Radiation: Defense, Health and Environment», Centre Léon-Bérard, 28, Rue Laennec, 69008 Lyon, France; (J.R.-V.); (L.E.-N.); (M.L.F.); (J.A.-C.); (A.G.); (A.B.)
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9
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Devic C, Ferlazzo ML, Berthel E, Foray N. Influence of Individual Radiosensitivity on the Hormesis Phenomenon: Toward a Mechanistic Explanation Based on the Nucleoshuttling of ATM Protein. Dose Response 2020; 18:1559325820913784. [PMID: 32425719 PMCID: PMC7218313 DOI: 10.1177/1559325820913784] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 02/02/2020] [Accepted: 02/18/2020] [Indexed: 12/16/2022] Open
Abstract
Hormesis is a low-dose phenomenon that has been reported to occur, to different extents, in animals, plants, and microorganisms. However, a review of the literature shows that only a few reports describe it in humans. Also, the diversity of experimental protocols and cellular models used makes deciphering the mechanisms of hormesis difficult. In humans, hormesis mostly appears in the 20 to 75 mGy dose range and in nontransformed, radioresistant cells. In a previous paper by Devic et al, a biological interpretation of the adaptive response (AR) phenomenon was proposed using our model that is based on the radiation-induced nucleoshuttling of the ATM protein (the RIANS model). Here, we showed that the 20 to 75 mGy dose range corresponds to a maximum amount of ATM monomers diffusing into the nucleus, while no DNA double-strand breaks is produced by radiation. These ATM monomers are suggested to help in recognizing and repairing spontaneous DNA breaks accumulated in cells and contribute to reductions in genomic instability and aging. The RIANS model also permitted the biological interpretation of hypersensitivity to low doses (HRS)-another low-dose phenomenon. Hence, for the first time to our knowledge, hormesis, AR, and HRS can be explained using the same unified molecular model.
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Affiliation(s)
- Clément Devic
- Institut National de la Santé et de la Recherche Médicale (INSERM), UA8 Unit "Radiations: Defense, Health and Environment," Centre Léon-Bérard, Lyon, France.,Fibermetrix Company, Strasbourg, France
| | - Mélanie L Ferlazzo
- Institut National de la Santé et de la Recherche Médicale (INSERM), UA8 Unit "Radiations: Defense, Health and Environment," Centre Léon-Bérard, Lyon, France
| | - Elise Berthel
- Institut National de la Santé et de la Recherche Médicale (INSERM), UA8 Unit "Radiations: Defense, Health and Environment," Centre Léon-Bérard, Lyon, France
| | - Nicolas Foray
- Institut National de la Santé et de la Recherche Médicale (INSERM), UA8 Unit "Radiations: Defense, Health and Environment," Centre Léon-Bérard, Lyon, France
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Berthel E, Foray N, Ferlazzo ML. The Nucleoshuttling of the ATM Protein: A Unified Model to Describe the Individual Response to High- and Low-Dose of Radiation? Cancers (Basel) 2019; 11:cancers11070905. [PMID: 31261657 PMCID: PMC6678722 DOI: 10.3390/cancers11070905] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 06/22/2019] [Accepted: 06/25/2019] [Indexed: 11/24/2022] Open
Abstract
The evaluation of radiation-induced (RI) risks is of medical, scientific, and societal interest. However, despite considerable efforts, there is neither consensual mechanistic models nor predictive assays for describing the three major RI effects, namely radiosensitivity, radiosusceptibility, and radiodegeneration. Interestingly, the ataxia telangiectasia mutated (ATM) protein is a major stress response factor involved in the DNA repair and signaling that appears upstream most of pathways involved in the three precited RI effects. The rate of the RI ATM nucleoshuttling (RIANS) was shown to be a good predictor of radiosensitivity. In the frame of the RIANS model, irradiation triggers the monomerization of cytoplasmic ATM dimers, which allows ATM monomers to diffuse in nucleus. The nuclear ATM monomers phosphorylate the H2AX histones, which triggers the recognition of DNA double-strand breaks and their repair. The RIANS model has made it possible to define three subgroups of radiosensitivity and provided a relevant explanation for the radiosensitivity observed in syndromes caused by mutated cytoplasmic proteins. Interestingly, hyper-radiosensitivity to a low dose and adaptive response phenomena may be also explained by the RIANS model. In this review, the relevance of the RIANS model to describe several features of the individual response to radiation was discussed.
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Affiliation(s)
- Elise Berthel
- Institut National de la Santé et de la Recherche Médicale, UA8, Radiations: Defense, Health and Environment, Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France
| | - Nicolas Foray
- Institut National de la Santé et de la Recherche Médicale, UA8, Radiations: Defense, Health and Environment, Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France.
| | - Mélanie L Ferlazzo
- Institut National de la Santé et de la Recherche Médicale, UA8, Radiations: Defense, Health and Environment, Centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France
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11
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Devic C, Ferlazzo ML, Foray N. Influence of Individual Radiosensitivity on the Adaptive Response Phenomenon: Toward a Mechanistic Explanation Based on the Nucleo-Shuttling of ATM Protein. Dose Response 2018; 16:1559325818789836. [PMID: 30093841 PMCID: PMC6081762 DOI: 10.1177/1559325818789836] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 05/29/2018] [Accepted: 06/12/2018] [Indexed: 02/03/2023] Open
Abstract
The adaptive response (AR) phenomenon generally describes a protective effect caused by a "priming" low dose (dAR) delivered after a period of time (ΔtAR) before a higher "challenging" dose (DAR). The AR is currently observed in human cells if dAR, ΔtAR, and DAR belong to (0.001-0.5 Gy), (2-24 hours), (0.1-5 Gy), respectively. In order to investigate the molecular mechanisms specific to AR in human cells, we have systematically reviewed the experimental AR protocols, the cellular models, and the biological endpoints used from the 1980s. The AR appears to be preferentially observed in radiosensitive cells and is strongly dependent on individual radiosensitivity. To date, the model of the nucleo-shuttling of the ATM protein provides a relevant mechanistic explanation of the AR molecular and cellular events. Indeed, the priming dose dAR may result in the diffusion of a significant amount of active ATM monomers in the nucleus. These ATM monomers, added to those induced directly by the challenging dose DAR, may increase the efficiency of the response to DAR by a better ATM-dependent DNA damage recognition. Such mechanistic model would also explain why AR is not observed in radioresistant or hyperradiosensitive cells. Further investigations at low dose are needed to consolidate our hypotheses.
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Affiliation(s)
- Clément Devic
- Institut National de la Santé et de la Recherche Médicale (INSERM), Lyon, France.,Fibermetrix Company, Strasbourg, France
| | - Mélanie L Ferlazzo
- Institut National de la Santé et de la Recherche Médicale (INSERM), Lyon, France
| | - Nicolas Foray
- Institut National de la Santé et de la Recherche Médicale (INSERM), Lyon, France
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12
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Mikalsen SG, Jeppesen Edin N, Sandvik JA, Pettersen EO. Separation of two sub-groups with different DNA content after treatment of T-47D breast cancer cells with low dose-rate irradiation and intermittent hypoxia. Acta Radiol 2018; 59:26-33. [PMID: 28350256 DOI: 10.1177/0284185117699999] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Background Previous studies have shown that combined treatment with internal ultra-low dose-rate irradiation selectively inactivated hypoxic T-47D breast cancer cells after three to five weeks of treatment. However, 2-3% of the hypoxic cells were found to survive and restart proliferation upon re-oxygenation. Purpose To investigate the metastatic potential and characteristics of radiosensitivity of these surviving cells, named T - 47 DS. Material and Methods The T - 47 DS cells were grown in ambient air without irradiation. A cloning experiment identified two sub-groups with different DNA content ([Formula: see text] and [Formula: see text]). Furthermore, radiosensitivity and presence of hyper-radiosensitivity (HRS) was measured by Co-60 challenge irradiation and relative migration was determined by scratch assays. Results The two subpopulations of T - 47 DS had different DNA content; one had abnormally high DNA content ([Formula: see text]) and one had DNA content similar to wild-type T-47D cells ([Formula: see text]). HRS was surprisingly present in cells of the cloned population [Formula: see text], but was absent in cells of both [Formula: see text] and T - 47 DS. The radio response of T - 47 DS, [Formula: see text] at higher radiation doses were similar to that of T-47D cells, and neither subpopulation showed increased migration compared with wild-type T-47D. Conclusion No increase in the risk of metastasis was found and only slight changes in radiosensitivity in response to conventional clinical doses was observed. Thus, the data suggest that if ultra-low dose-rate irradiation is used for targeting the hypoxic tumor fraction, conventional high dose-rate irradiation can be used to eradicate eventual surviving cells as well as cells in the well oxygenated areas of the tumor.
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Affiliation(s)
- Stine Gyland Mikalsen
- Department of Physics, University of Oslo, Oslo, Norway
- Department of Medical Physics, Oslo University Hospital, Oslo, Norway
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Zhou C, Rong Y, Konishi T, Xiang Z, Zihui F, Hong M. Effect of Carbon-Ion Radiation on Drug Transporters Organic Anion Transporting Polypeptides in Breast Cancer Cells. Radiat Res 2017; 187:689-700. [PMID: 28388363 DOI: 10.1667/rr14603.1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Organic anion transporting polypeptides (OATPs) are a family of membrane uptake transporters that play important roles in absorption, distribution, metabolism and excretion of a wide range of endogenous and exogenous compounds. OATP members, such as OATP1A2, 1B1 and 1B3, were found to transport numerous anticancer agents. For this reason, these uptake transporters have been proposed to serve as novel and potential therapeutic targets for chemotherapy. Previously published studies from our laboratory demonstrated that OATP1A2 expression was upregulated in breast cancer MCF7 cells after X-ray irradiation and the transport of its substrate methotrexate was increased. In the current study, we investigated the effect of carbon-ion radiation on MCF7 and MDA-MB231 cells. We observed significant upregulation of OATP1A2 expression in the hormone-dependent MCF7 cells, especially when irradiated with a low dose (0.5 Gy). For the hormone-independent MDA-MB231 cells, while irradiation with a higher dose exerted a greater effect, only a moderate change was observed compared to that of the MCF7 cells. Combined treatments of OATP1A2 substrates 5-fluorouracil, paclitaxel and methotrexate with 0.5 Gy irradiation resulted in greater cytotoxicity toward MCF7 cells than with the treatment of antineoplastic agents and higher doses. Therefore, heavy ions, such as carbon, can affect expression of drug transporters and show promise in facilitating the delivery of antitumor drugs with greater efficiency.
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Affiliation(s)
- Chao Zhou
- a College of Life Science, South China Agricultural University, Guangzhou, China
| | - Yang Rong
- a College of Life Science, South China Agricultural University, Guangzhou, China
| | - Teruaki Konishi
- b Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Chiba, Japan
| | - Zhaojian Xiang
- a College of Life Science, South China Agricultural University, Guangzhou, China
| | - Fang Zihui
- a College of Life Science, South China Agricultural University, Guangzhou, China
| | - Mei Hong
- a College of Life Science, South China Agricultural University, Guangzhou, China
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14
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A reaction-diffusion model for radiation-induced bystander effects. J Math Biol 2016; 75:341-372. [PMID: 28035423 DOI: 10.1007/s00285-016-1090-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 12/08/2016] [Indexed: 12/29/2022]
Abstract
We develop and analyze a reaction-diffusion model to investigate the dynamics of the lifespan of a bystander signal emitted when cells are exposed to radiation. Experimental studies by Mothersill and Seymour 1997, using malignant epithelial cell lines, found that an emitted bystander signal can still cause bystander effects in cells even 60 h after its emission. Several other experiments have also shown that the signal can persist for months and even years. Also, bystander effects have been hypothesized as one of the factors responsible for the phenomenon of low-dose hyper-radiosensitivity and increased radioresistance (HRS/IRR). Here, we confirm this hypothesis with a mathematical model, which we fit to Joiner's data on HRS/IRR in a T98G glioma cell line. Furthermore, we use phase plane analysis to understand the full dynamics of the signal's lifespan. We find that both single and multiple radiation exposure can lead to bystander signals that either persist temporarily or permanently. We also found that, in an heterogeneous environment, the size of the domain exposed to radiation and the number of radiation exposures can determine whether a signal will persist temporarily or permanently. Finally, we use sensitivity analysis to identify those cell parameters that affect the signal's lifespan and the signal-induced cell death the most.
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15
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Hanu C, Wong R, Sur RK, Hayward JE, Seymour C, Mothersill C. Low-dose non-targeted radiation effects in human esophageal adenocarcinoma cell lines. Int J Radiat Biol 2016; 93:165-173. [PMID: 27653785 DOI: 10.1080/09553002.2017.1237057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
PURPOSE To investigate non-targeted radiation effects in esophageal adenocarcinoma cell lines (OE19 and OE33) using human keratinocyte and colorectal cancer cell reporters following γ-ray exposure. MATERIALS AND METHODS Both clonogenic assays and ratiometric calcium endpoints were used to check for the occurrence of bystander signals in reporter cells. RESULTS We report data suggesting that γ-irradiation increases cell killing over the expected linear quadratic (LQ) model levels in the OE19 cell line exposed to doses below 1 Gy, i.e. which may be suggestive to be a low hyper-radiosensitive (HRS) response to direct irradiation. Both EAC cell lines (OE19 and OE33) have the ability to produce bystander signals when irradiated cell conditioned medium (ICCM) is placed onto human keratinocyte reporters, but do not seem to be capable of responding to bystander signals when placed on their autologous reporters. Further work with human keratinocyte reporter models showed statistically significant intracellular calcium fluxes following exposure of the reporters to ICCM harvested from both EAC cell lines exposed to 0.5 Gy. CONCLUSION These experiments suggest that the OE19 and OE33 cell lines produce bystander signals in human keratinocyte reporter cells. However, the radiosensitivity of the EAC cell lines used in this study cannot be enhanced by the bystander response since both cell lines could not respond to bystander signals.
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Affiliation(s)
- Christine Hanu
- a Medical Physics & Applied Radiation Sciences , McMaster University , Hamilton , ON , Canada
| | - Raimond Wong
- b Department of Oncology and McMaster University , Hamilton , ON , Canada
| | - Ranjan K Sur
- b Department of Oncology and McMaster University , Hamilton , ON , Canada
| | - Joseph E Hayward
- a Medical Physics & Applied Radiation Sciences , McMaster University , Hamilton , ON , Canada.,c Department of Radiology , McMaster University , Hamilton , ON , Canada
| | - Colin Seymour
- a Medical Physics & Applied Radiation Sciences , McMaster University , Hamilton , ON , Canada
| | - Carmel Mothersill
- a Medical Physics & Applied Radiation Sciences , McMaster University , Hamilton , ON , Canada
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16
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De Santis MC, Nardone L, Diletto B, Canna R, Dispinzieri M, Marino L, Lozza L, Valentini V. Comparison of two radiation techniques for the breast boost in patients undergoing neoadjuvant treatment for breast cancer. Br J Radiol 2016; 89:20160264. [PMID: 27452265 DOI: 10.1259/bjr.20160264] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE After breast conservative surgery (BCS) and whole-breast radiotherapy (WBRT), the use of boost irradiation is recommended especially in patients at high risk. However, the standard technique and the definition of the boost volume have not been well defined. METHODS We retrospectively compared an anticipated pre-operative photon boost on the tumour, administered with low-dose fractionated radiotherapy, and neoadjuvant chemotherapy with two different sequential boost techniques, administered after BCS and standard adjuvant WBRT: (1) a standard photon beam (2) and an electron beam technique on the tumour bed of the same patients. The plans were analyzed for the dosimetric coverage of the CT-delineated irradiated volume. The minimal dose received by 95% of the target volume (D95), the minimal dose received by 90% of the target volume (D90) and geographic misses were evaluated. RESULTS 15 patients were evaluated. The sequential photon and electron boost techniques resulted in inferior target volume coverage compared with the anticipated boost technique, with a median D95 of 96.3% (range 94.7-99.6%) and 0.8% (range 0-30%) and a median D90 of 99.1% (range 90.2-100%) and 54.7% (range 0-84.8%), respectively. We observed a geographic miss in 26.6% of sequential electron plans. The results of the anticipated boost technique were better: 99.4% (range 96.5-100%) and 97.1% (range 86.2-99%) for median D90 and median D95, respectively, and no geographic miss was observed. We observed a dose reduction to the heart, with left-sided breast irradiation, using the anticipated pre-operative boost technique, when analyzed for all dose-volume parameters. When compared with the sequential electron plans, the pre-operative photon technique showed a higher median ipsilateral lung Dmax. CONCLUSION Our data show that an anticipated pre-operative photon boost results in a better coverage with respect to the standard sequential boost while also saving the organs at risk and consequently fewer side effects. ADVANCES IN KNOWLEDGE This is the first dosimetric study that evaluated the association between an anticipated boost and neoadjuvant chemotherapy treatment.
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Affiliation(s)
- Maria C De Santis
- 1 Radiotherapy Unit 1, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Luigia Nardone
- 2 Department of Radiation Oncology, Catholic University of the Sacred Heart, Rome, Italy
| | - Barbara Diletto
- 1 Radiotherapy Unit 1, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Roberta Canna
- 2 Department of Radiation Oncology, Catholic University of the Sacred Heart, Rome, Italy
| | - Michela Dispinzieri
- 1 Radiotherapy Unit 1, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Lorenza Marino
- 3 Division of Radiotherapy, REM-Istituto Oncologico del Mediterraneo, Catania, Italy
| | - Laura Lozza
- 1 Radiotherapy Unit 1, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Vincenzo Valentini
- 2 Department of Radiation Oncology, Catholic University of the Sacred Heart, Rome, Italy
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17
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Dionet C, Müller-Barthélémy M, Marceau G, Denis JM, Averbeck D, Gueulette J, Sapin V, Pereira B, Tchirkov A, Chautard E, Verrelle P. Different dose rate-dependent responses of human melanoma cells and fibroblasts to low dose fast neutrons. Int J Radiat Biol 2016; 92:527-35. [PMID: 27258624 DOI: 10.1080/09553002.2016.1186300] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
PURPOSE To analyze the dose rate influence in hyper-radiosensitivity (HRS) of human melanoma cells to very low doses of fast neutrons and to compare to the behaviour of normal human skin fibroblasts. MATERIALS AND METHODS We explored different neutron dose rates as well as possible implication of DNA double-strand breaks (DSB), apoptosis, and energy-provider adenosine-triphosphate (ATP) levels during HRS. RESULTS HRS in melanoma cells appears only at a very low dose rate (VLDR), while a high dose rate (HDR) induces an initial cell-radioresistance (ICRR). HRS does not seem to be due either to DSB or to apoptosis. Both phenomena (HRS and ICRR) appear to be related to ATP availability for triggering cell repair. Fibroblast survival after neutron irradiation is also dose rate-dependent but without HRS. CONCLUSIONS Melanoma cells or fibroblasts exert their own survival behaviour at very low doses of neutrons, suggesting that in some cases there is a differential between cancer and normal cells radiation responses. Only the survival of fibroblasts at HDR fits the linear no-threshold model. This new insight into human cell responses to very low doses of neutrons, concerns natural radiations, surroundings of accelerators, proton-therapy devices, flights at high altitude. Furthermore, ATP inhibitors could increase HRS during high-linear energy transfer (high-LET) irradiation.
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Affiliation(s)
- Claude Dionet
- a Centre Jean Perrin , Laboratoire de Radio-Oncologie Expérimentale , Clermont-Ferrand , France
| | - Melanie Müller-Barthélémy
- a Centre Jean Perrin , Laboratoire de Radio-Oncologie Expérimentale , Clermont-Ferrand , France ;,b Clermont Université, Université d'Auvergne, EA7283 CREaT , Clermont-Ferrand , France
| | - Geoffroy Marceau
- c Biochimie et Biologie Moléculaire , CHU Clermont-Ferrand, Centre de Biologie , Clermont-Ferrand , France
| | - Jean-Marc Denis
- d Radiotherapy Department , Cliniques Universitaires Saint Luc-UCL , Bruxelles , Belgique ;,f Université Catholique de Louvain (UCL-IREC-MIRO) , Bruxelles , Belgique
| | - Dietrich Averbeck
- e Institut Curie-Recherche, UMR3348 CNRS/IC, Centre Universitaire, Orsay , France
| | - John Gueulette
- f Université Catholique de Louvain (UCL-IREC-MIRO) , Bruxelles , Belgique
| | - Vincent Sapin
- c Biochimie et Biologie Moléculaire , CHU Clermont-Ferrand, Centre de Biologie , Clermont-Ferrand , France
| | - Bruno Pereira
- g CHU Clermont-Ferrand, Biostatistics unit (DRCI) , Clermont-Ferrand , France
| | - Andrei Tchirkov
- h Cytogénétique médicale, CHU Estaing , Clermont-Ferrand , France
| | - Emmanuel Chautard
- a Centre Jean Perrin , Laboratoire de Radio-Oncologie Expérimentale , Clermont-Ferrand , France ;,b Clermont Université, Université d'Auvergne, EA7283 CREaT , Clermont-Ferrand , France
| | - Pierre Verrelle
- a Centre Jean Perrin , Laboratoire de Radio-Oncologie Expérimentale , Clermont-Ferrand , France ;,b Clermont Université, Université d'Auvergne, EA7283 CREaT , Clermont-Ferrand , France
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18
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Fernandez-Palomo C, Seymour C, Mothersill C. Inter-Relationship between Low-Dose Hyper-Radiosensitivity and Radiation-Induced Bystander Effects in the Human T98G Glioma and the Epithelial HaCaT Cell Line. Radiat Res 2016; 185:124-33. [PMID: 26849405 DOI: 10.1667/rr14208.1] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Over the past several years, investigations in both low-dose hyper-radiosensitivity and increased radioresistance have been a focus of radiation oncology and biology research, since both conditions occur primarily in tumor cell lines. There has been significant progress in elucidating their signaling pathways, however uncertainties exist when they are studied together with radiation-induced bystander effects. Therefore, the aim of this work was to further investigate this relationship using the T98G glioma and HaCaT cell lines. T98G glioma cells have demonstrated a strong transition from hyper-radiosensitivity to induced radioresistance, and HaCaT cells do not show low-dose hypersensitivity. Both cell lines were paired using a mix-and-match protocol, which involved growing nonirradiated cells in culture media from irradiated cells and covering all possible combinations between them. The end points analyzed were clonogenic cell survival and live calcium measurements through the cellular membrane. Our data demonstrated that T98G cells produced bystander signals that decreased the survival of both reporter T98G and HaCaT cells. The bystander effect occurred only when T98G cells were exposed to doses below 1 Gy, which was corroborated by the induction of calcium fluxes. However, when bystander signals originated from HaCaT cells, the survival fraction increased in reporter T98G cells while it decreased in HaCaT cells. Moreover, the corresponding calcium data showed no calcium fluxes in T98G cells, while HaCaT cells displayed a biphasic calcium profile. In conclusion, our findings indicate a possible link between low-dose hyper-radiosensitivity and bystander effects. This relationship varies depending on which cell line functions as the source of bystander signals. This further suggests that the bystander mechanisms are more complex than previously expected and caution should be taken when extrapolating bystander results across all cell lines and all radiation doses.
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Affiliation(s)
- Cristian Fernandez-Palomo
- Medical Physics and Applied Radiation Sciences Department, McMaster University, Hamilton, Ontario, L8S 1K4, Canada
| | - Colin Seymour
- Medical Physics and Applied Radiation Sciences Department, McMaster University, Hamilton, Ontario, L8S 1K4, Canada
| | - Carmel Mothersill
- Medical Physics and Applied Radiation Sciences Department, McMaster University, Hamilton, Ontario, L8S 1K4, Canada
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19
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Beauchesne P, Quillien V, Faure G, Bernier V, Noel G, Quetin P, Gorlia T, Carnin C, Pedeux R. A concurrent ultra-fractionated radiation therapy and temozolomide treatment: A promising therapy for newly diagnosed, inoperable glioblastoma. Int J Cancer 2015; 138:1538-44. [PMID: 26501997 DOI: 10.1002/ijc.29898] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 10/06/2015] [Accepted: 10/09/2015] [Indexed: 11/06/2022]
Abstract
We report on a phase II clinical trial to determine the effect of a concurrent ultra-fractionated radiotherapy and temozolomide treatment in inoperable glioblastoma patients. A phase II study opened; patients over 18 years of age who were able to give informed consent and had histologically proven, newly diagnosed inoperable diagnosed and supratentorial glioblastoma were eligible. Three doses of 0.75 Gy spaced apart by at least 4 hr were delivered daily, 5 days a week for six consecutive weeks for a total of 67.5 Gy. Chemotherapy was administered during the same period, which consisted of temozolomide given at a dose of 75 mg/m(2) for 7 days a week. After a 4-week break, chemotherapy was resumed for up to six cycles of adjuvant temozolomide treatment, given every 28 days, according to the standard 5-day regimen. Tolerance and toxicity were the primary endpoints; survival and progression-free survival were the secondary endpoints. In total, 40 patients were enrolled in this study, 29 men and 11 women. The median age was 58 years, and the median Karnofsky performance status was 80. The concomitant ultra-fractionated radiotherapy and temozolomide treatment was well tolerated. Complete responses were seen in four patients, and partial responses were reported in seven patients. The median survival from the initial diagnosis was 16 months. Several long-term survivors were noted. Concurrent ultra-fractionated radiation therapy and temozolomide treatment are well accepted by the patients. The results showed encouraging survival rates for these unfavorable patients.
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Affiliation(s)
- P Beauchesne
- Service de Neuro-Oncologie, CHU De Nancy, Nancy, France
| | - V Quillien
- Departement de Biologie, Centre E Marquis, Rennes, France.,CNRS, UMR 6290, Universite Rennes 1, Rennes, France
| | - G Faure
- Centre Private de Radiothérapie, Centre C Bernard, Metz, France
| | - V Bernier
- Departement de Radiathérapie, Institut De Cancérologie Lorrain, Vandoeuvre, France
| | - G Noel
- Departement de Radiothérapie, Centre P Strauss, Strasbourg, France
| | - P Quetin
- Departement de Radiothérapie, CHR Metz Mercy, France
| | - T Gorlia
- EORTC Data Center, Bruxelles, Belgique
| | - C Carnin
- Service de Neuro-Oncologie, CHU De Nancy, Nancy, France
| | - R Pedeux
- INSERM U917, Rennes, France.,INSERM ER440-OSS, Centre Eugène Marquis, Rennes, France
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20
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Low-dose fractionated radiation and chemotherapy prior to definitive chemoradiation in locally advanced carcinoma of the uterine cervix: Results of a prospective phase II clinical trial. Gynecol Oncol 2015; 138:292-8. [DOI: 10.1016/j.ygyno.2015.05.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 05/16/2015] [Indexed: 11/24/2022]
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21
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Edin NFJ. The role of interleukin-13 in the removal of hyper-radiosensitivity by priming irradiation. JOURNAL OF RADIATION RESEARCH 2014; 55:1066-1074. [PMID: 24966400 PMCID: PMC4229918 DOI: 10.1093/jrr/rru053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Revised: 04/29/2014] [Accepted: 05/23/2014] [Indexed: 06/03/2023]
Abstract
It has previously been demonstrated that the presence of fetal bovine serum is necessary for TGF-β3 (transforming growth factor beta 3)-dependent elimination of low-dose hyper-radiosensitivity (HRS) in cells by 1 h of low-dose-rate γ-irradiation (0.2-0.3 Gy/h). The purpose of the present study was to identify the serum constituent involved. Two human HRS-positive (T-47D, T98G) cell lines were used. The effects of different pretreatments on HRS were investigated using the colony assay. Total inducible nitric oxide synthase (iNOS) levels were measured using a cell-based ELISA assay. The serum factor was identified as interleukin-13 (IL-13). In order for low dose-rate irradiation to eliminate HRS through the TGF-β3-dependent mechanism, the cells must be exposed to IL-13 first. Inhibiting receptor IL-13Rα2 showed that this receptor is involved in the response. Adding IL-13 to serum-free medium restored the properties of full medium but not when an inhibitor of proprotein convertase activity was added together with IL-13. The presence of IL-13 resulted in upregulation of total iNOS protein levels. Thus, this study indicates that IL-13 interacts with the cells though receptor IL-13Rα2 and induces upregulation of iNOS and activation of one or more furin-like proprotein convertases.
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Affiliation(s)
- Nina F Jeppesen Edin
- Department of Physics, Biophysics Group, University of Oslo, PB 1048, Blindern, N-0316 Oslo, Norway
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22
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Martin LM, Marples B, Lynch TH, Hollywood D, Marignol L. Exposure to low dose ionising radiation: Molecular and clinical consequences. Cancer Lett 2014; 349:98-106. [DOI: 10.1016/j.canlet.2013.12.015] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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23
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Prasanna A, Ahmed MM, Mohiuddin M, Coleman CN. Exploiting sensitization windows of opportunity in hyper and hypo-fractionated radiation therapy. J Thorac Dis 2014; 6:287-302. [PMID: 24688774 DOI: 10.3978/j.issn.2072-1439.2014.01.14] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Accepted: 01/12/2014] [Indexed: 12/13/2022]
Abstract
In contrast to the conventional radiotherapy/chemoradiotherapy paradigms used in the treatment of majority of cancer types, this review will describe two areas of radiobiology, hyperfractionated and hypofractionated radiation therapy, for cancer treatment focusing on application of novel concepts underlying these treatment modalities. The initial part of the review discusses the phenomenon of hyper-radiation sensitivity (HRS) at lower doses (0.1 to 0.6 Gy), describing the underlying mechanisms and how this could enhance the effects of chemotherapy, particularly, in hyperfractionated settings. The second part examines the radiobiological/physiological mechanisms underlying the effects of high-dose hypofractionated radiation therapy that can be exploited for tumor cure. These include abscopal/bystander effects, activation of immune system, endothelial cell death and effect of hypoxia with re-oxygenation. These biological properties along with targeted dose delivery and distribution to reduce normal tissue toxicity may make high-dose hypofractionation more effective than conventional radiation therapy for treatment of advanced cancers. The novel radiation physics based methods that take into consideration the tumor volume to be irradiated and normal tissue avoidance/tolerance can further improve treatment outcome and post-treatment quality of life. In conclusion, there is enough evidence to further explore novel avenues to exploit biological mechanisms from hyper-fractionation by enhancing the efficacy of chemotherapy and hypo-fractionated radiation therapy that could enhance tumor control and use imaging and technological advances to reduce toxicity.
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Affiliation(s)
- Anish Prasanna
- 1 Radiation Research Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, National Institutes of Health, Rockville, MD, USA ; 2 Oncology Centre, King Faisal Specialist Hospital and Research Centre, Riyadh, Kingdom of Saudi Arabia
| | - Mansoor M Ahmed
- 1 Radiation Research Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, National Institutes of Health, Rockville, MD, USA ; 2 Oncology Centre, King Faisal Specialist Hospital and Research Centre, Riyadh, Kingdom of Saudi Arabia
| | - Mohammed Mohiuddin
- 1 Radiation Research Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, National Institutes of Health, Rockville, MD, USA ; 2 Oncology Centre, King Faisal Specialist Hospital and Research Centre, Riyadh, Kingdom of Saudi Arabia
| | - C Norman Coleman
- 1 Radiation Research Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, National Institutes of Health, Rockville, MD, USA ; 2 Oncology Centre, King Faisal Specialist Hospital and Research Centre, Riyadh, Kingdom of Saudi Arabia
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24
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Foray N, Badie C, Alsbeih G, Lambin P, Geara F, Taghian AG, Deschavanne P, Gueulette J, Courdi A, Chavaudra N, Fertil B. Edmond-Philippe Malaise (1930-2013): a lifetime of perseverance leads to the cellular definition of intrinsic radiosensitivity. Int J Radiat Oncol Biol Phys 2014; 88:1215-7. [PMID: 24661678 DOI: 10.1016/j.ijrobp.2013.12.049] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Accepted: 12/30/2013] [Indexed: 10/25/2022]
Affiliation(s)
- Nicolas Foray
- Institut National de la Santé et de la Recherche Médicale, UMR1052, Cancer Research Centre of Lyon, Radiobiology Group, Lyon, France.
| | - Christophe Badie
- Cancer Genetics and Cytogenetics Group Biological Effects Department, Centre for Radiation, Chemical & Environmental Hazards Public Health England, Didcot, United Kingdom
| | - Ghazi Alsbeih
- King Faisal Specialist Hospital & Research Centre (KFSH&RC), Riyadh, Kingdom of Saudi Arabia
| | | | - Fady Geara
- The American University of Beirut Medical Center, Beirut, Lebanon
| | - Alphonse G Taghian
- Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts
| | - Patrick Deschavanne
- Institut National de la Santé et de la Recherche Médicale, U973, Université Paris-Diderot, Paris, France
| | - John Gueulette
- Université Catholique de Louvain, Place de l'Université, Belgique
| | | | - Nicole Chavaudra
- Institut National de la Santé et de la Recherche Médicale, U647, Institut Gustave-Roussy, Villejuif, France
| | - Bernard Fertil
- Centre National de la Recherche Scientifique, UMR 7296, Marseille, France
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25
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Edin NJ, Sandvik JA, Cheng C, Bergersen L, Pettersen EO. The roles of TGF-β3 and peroxynitrite in removal of hyper-radiosensitivity by priming irradiation. Int J Radiat Biol 2014; 90:527-37. [PMID: 24650070 DOI: 10.3109/09553002.2014.906767] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE To investigate the mechanisms inducing and maintaining the permanent elimination of low dose hyper-radiosensitivity (HRS) in cells given a dose of 0.3 Gy at low dose-rate (LDR) (0.3 Gy/h). MATERIALS AND METHODS Two human HRS-positive cell lines (T-47D, T98G) were used. The effects of pretreatments with transforming growth factor beta (TGF-β) neutralizers, TGF-β3 or peroxynitrite scavenger on HRS were investigated using the colony assay. Cytoplasmic levels of TGF-β3 were measured using post-embedding immunogold electron microscopic analysis. RESULTS TGF-β3 neutralizer inhibited the removal of HRS by LDR irradiation. Adding 0.001 ng/ml TGF-β3 to cells removed HRS in T98G cells while 0.01 ng/ml additionally induced resistance to higher doses. Cytoplasmic levels of TGF-β3 were higher in LDR-primed cells than in unirradiated cells. The presence of the peroxynitrite scavenger uric acid inhibited the effect of LDR irradiation. Furthermore, the permanent elimination of HRS in LDR-primed cells was reversed by treatment with uric acid. The removal of HRS by medium from hypoxic cells was inhibited by adding TGF-β3 neutralizer to the medium before transfer or by adding hypoxia inducible factor 1 (HIF-1) inhibitor chetomin to the cell medium during hypoxia. CONCLUSIONS TGF-β3 is involved in the regulation of cellular responses to small doses of acute irradiation. TGF-β3 activation seems to be induced by low dose-rate irradiation by a mechanism involving inducible nitric oxide (iNOS) and peroxynitrite, or during cycling hypoxia by a mechanism most likely involving HIF-1. The study suggests methods to turn resistance to doses in the HRS-range on (by TGF-β3) or off (by TGF-β3 neutralizer or by peroxynitrite inhibition).
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Edin NJ, Sandvik JA, Vollan HS, Reger K, Görlach A, Pettersen EO. The role of nitric oxide radicals in removal of hyper-radiosensitivity by priming irradiation. JOURNAL OF RADIATION RESEARCH 2013; 54:1015-28. [PMID: 23685670 PMCID: PMC3823782 DOI: 10.1093/jrr/rrt061] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
In this study, a mechanism in which low-dose hyper-radiosensitivity (HRS) is permanently removed, induced by low-dose-rate (LDR) (0.2-0.3 Gy/h for 1 h) but not by high-dose-rate priming (0.3 Gy at 40 Gy/h) was investigated. One HRS-negative cell line (NHIK 3025) and two HRS-positive cell lines (T-47D, T98G) were used. The effects of different pretreatments on HRS were investigated using the colony assay. Cell-based ELISA was used to measure nitric oxide synthase (NOS) levels, and microarray analysis to compare gene expression in primed and unprimed cells. The data show how permanent removal of HRS, previously found to be induced by LDR priming irradiation, can also be induced by addition of nitric oxide (NO)-donor DEANO combined with either high-dose-rate priming or exposure to prolonged cycling hypoxia followed by reoxygenation, a treatment not involving radiation. The removal of HRS appears not to involve DNA damage induced during priming irradiation as it was also induced by LDR irradiation of cell-conditioned medium without cells present. The permanent removal of HRS in LDR-primed cells was reversed by treatment with inducible nitric oxide synthase (iNOS) inhibitor 1400W. Furthermore, 1400W could also induce HRS in an HRS-negative cell line. The data suggest that LDR irradiation for 1 h, but not 15 min, activates iNOS, and also that sustained iNOS activation is necessary for the permanent removal of HRS by LDR priming. The data indicate that nitric oxide production is involved in the regulatory processes determining cellular responses to low-dose-rate irradiation.
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Affiliation(s)
- Nina Jeppesen Edin
- Department of Physics, University of Oslo, 0316 Oslo, Norway
- Department of Radiation Biology, Institute for Cancer Research, University Hospital, University of Oslo, 0310 Oslo, Norway
- Corresponding author. Department of Physics, Biophysics Group, PB 1048 Blindern, N-0316 Oslo, Norway. Tel: +47-22-85-54-92; Fax: +47-228-556-71;
| | | | - Hilde Synnøve Vollan
- Department of Clinical Molecular Biology (EpiGen), Institute of Clinical Medicine, Akershus University Hospital, University of Oslo, 1478 Lørenskog, Norway
| | - Katharina Reger
- Experimental and Molecular Pediatric Cardiology, Department of Pediatric Cardiology and Congenital Heart Disease, German Heart Center Munich, Lazarettstr. 36, 80636 Munich, Germany
| | - Agnes Görlach
- Experimental and Molecular Pediatric Cardiology, Department of Pediatric Cardiology and Congenital Heart Disease, German Heart Center Munich, Lazarettstr. 36, 80636 Munich, Germany
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Beauchesne P. Three-times daily ultrafractionated radiation therapy, a novel and promising regimen for glioblastoma patients. Cancers (Basel) 2013; 5:1199-211. [PMID: 24202441 PMCID: PMC3875935 DOI: 10.3390/cancers5041199] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Revised: 08/16/2013] [Accepted: 08/18/2013] [Indexed: 01/11/2023] Open
Abstract
Glioblastomas are considered to be one of the most radio resistant tumors. Despite new therapies, the prognosis of this disease remains dismal. Also, the mechanisms of radiation resistance in mammalian cells are more complex than once believed. Experimental studies have indicated that some human cell lines are sensitive to low radiation doses of <1 Gy. This phenomenon has been termed low-dose hyper-radio-sensitivity (HRS), and is more apparent in radio resistant cell lines, such as glioblastoma cells. Sensitivity may result from the inability of low dose radiation to efficiently induce repair mechanisms, whereas higher doses cause enough damage to trigger repair responses for radio resistance. In vitro studies have demonstrated this phenomenon using various human malignant glioma cell lines: (1) daily repeated irradiation of cells with low doses compared to irradiation using a single biologically equivalent dose resulted in significantly higher cell killing; (2) experiments conducted on glioma xenografts demonstrated that repeated irradiation with low doses was more effective for inhibiting tumor growth than a single dose. In order to confirm and validate these promising studies on HRS, a few phase II trials were developed. For translating the experimental observations into the clinic, ultra fractionation protocols (with three daily doses) were tested in glioblastoma patients. Tolerance and toxicity were the primary endpoints, with overall survival as a secondary endpoint. These protocols were initiated before concomitant radio chemotherapy became the standard of care. For these trials, patients with an unfavorable clinical prognostic factor of newly unresectable GBM were included. When comparing the results of these trials with international literature using multivariate analysis for both progression free survival and overall survival, ultra fractionated irradiation showed superiority over radiotherapy alone. In addition, it was found to be equivalent to treatment using radiotherapy and temozolomide. Therefore, ultra fractionated protocols may prolong survival of glioblastoma patients. In this review, we describe the main experimental data regarding low-dose hypersensitivity as well as the findings of clinical trials that have investigated this new radiotherapy regimen.
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Affiliation(s)
- Patrick Beauchesne
- Neuro-Oncology Department, CHU de Nancy, Hospital Central, Nancy 54035, France.
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Amendola R, Cervelli M, Tempera G, Fratini E, Varesio L, Mariottini P, Agostinelli E. Spermine metabolism and radiation-derived reactive oxygen species for future therapeutic implications in cancer: an additive or adaptive response. Amino Acids 2013; 46:487-98. [PMID: 23999645 DOI: 10.1007/s00726-013-1579-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Accepted: 08/07/2013] [Indexed: 02/07/2023]
Abstract
Destruction of cells by irradiation-induced radical formation is one of the most frequent interventions in cancer therapy. An alternative to irradiation-induced radical formation is in principle drug-induced formation of radicals, and the formation of toxic metabolites by enzyme catalyzed reactions. Thus, combination therapy targeting polyamine metabolism could represent a promising strategy to fight hyper-proliferative disease. The aim of this work is to discuss and evaluate whether the presence of a DNA damage provoked by enzymatic ROS overproduction may act as an additive or adaptive response upon radiation and combination of hyperthermia with lysosomotropic compounds may improve the cytocidal effect of polyamines oxidation metabolites. Low level of X-irradiations delivers challenging dose of damage and an additive or adaptive response with the chronic damage induced by spermine oxidase overexpression depending on the deficiency of the DNA repair mechanisms. Since reactive oxygen species lead to membrane destabilization and cell death, we discuss the effects of BSAO and spermine association in multidrug resistant cells that resulted more sensitive to spermine metabolites than their wild-type counterparts, due to an increased mitochondrial activity. Since mammal spermine oxidase is differentially activated in a tissue specific manner, and cancer cells can differ in term of DNA repair capability, it could be of interest to open a scientific debate to use combinatory treatments to alter spermine metabolism and deliver differential response.
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Thomas C, Martin J, Devic C, Bräuer-Krisch E, Diserbo M, Thariat J, Foray N. Impact of dose-rate on the low-dose hyper-radiosensitivity and induced radioresistance (HRS/IRR) response. Int J Radiat Biol 2013; 89:813-22. [PMID: 23631649 DOI: 10.3109/09553002.2013.800248] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
PURPOSE To ask whether dose-rate influences low-dose hyper- radiosensitivity and induced radioresistance (HRS/IRR) response in rat colon progressive (PRO) and regressive (REG) cells. METHODS Clonogenic survival was applied to tumorigenic PRO and non-tumorigenic REG cells irradiated with (60)Co γ-rays at 0.0025-500 mGy.min(-1). Both clonogenic survival and non-homologous end-joining (NHEJ) pathway involved in DNA double-strand breaks (DSB) repair assays were applied to PRO cells irradiated at 25 mGy.min(-1) with 75 kV X-rays only. RESULTS Irrespective of dose-rates, marked HRS/IRR responses were observed in PRO but not in REG cells. For PRO cells, the doses at which HRS and IRR responses are maximal were dependent on dose-rate; conversely exposure times during which HRS and IRR responses are maximal (t(HRSmax) and t(IRRmax)) were independent of dose-rate. The t(HRSmax) and t(IRRmax) values were 23 ± 5 s and 66 ± 7 s (mean ± standard error of the mean [SEM], n = 7), in agreement with literature data. Repair data show that t(HRSmax) may correspond to exposure time during which NHEJ is deficient while t(IRRmax) may correspond to exposure time during which NHEJ is complete. CONCLUSION HRS response may be maximal if exposure times are shorter than t(HRSmax) irrespective of dose, dose-rate and cellular model. Potential application of HRS response in radiotherapy is discussed.
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Affiliation(s)
- Charles Thomas
- Institut National de la Santé et de la Recherche Médicale (INSERM) U 1052, groupe de radiobiologie , Lyon
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Exposure to low dose ionising radiation: molecular and clinical consequences. Cancer Lett 2013; 338:209-18. [PMID: 23693079 DOI: 10.1016/j.canlet.2013.05.021] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2012] [Revised: 05/10/2013] [Accepted: 05/13/2013] [Indexed: 12/19/2022]
Abstract
This review article provides a comprehensive overview of the experimental data detailing the incidence, mechanism and significance of low dose hyper-radiosensitivity (HRS). Important discoveries gained from past and present studies are mapped and highlighted to illustrate the pathway to our current understanding of HRS and the impact of HRS on the cellular response to radiation in mammalian cells. Particular attention is paid to the balance of evidence suggesting a role for DNA repair processes in the response, evidence suggesting a role for the cell cycle checkpoint processes, and evidence investigating the clinical implications/relevance of the effect.
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Colin C, de Vathaire F, Noël A, Charlot M, Devic C, Foray N, Valette PJ. Updated Relevance of Mammographic Screening Modalities in Women Previously Treated with Chest Irradiation for Hodgkin Disease. Radiology 2012; 265:669-76. [DOI: 10.1148/radiol.12120794] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Guirado D, Aranda M, Ortiz M, Mesa JA, Zamora LI, Amaya E, Villalobos M, Lallena AM. Low-dose radiation hyper-radiosensitivity in multicellular tumour spheroids. Br J Radiol 2012; 85:1398-406. [PMID: 22972973 DOI: 10.1259/bjr/33201506] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE We propose and study a new model aimed at describing the low-dose hyper-radiosensitivity phenomenon appearing in the survival curves of different cell lines. METHODS The model uses the induced repair assumption, considering that the critical dose at which this mechanism begins to act varies from cell to cell in a given population. The model proposed is compared with the linear-quadratic model and the modified linear-quadratic model, which is commonly used in literature and in which the induced repair is taken into account in a heuristic way. The survival curve for the MCF-7 line of human breast cancer is measured at low absorbed doses and the uncertainties in these doses are estimated using thermoluminiscent dosemeters. RESULTS It is shown that these multicellular spheroids present low-dose hyper-radiosensitivity. The new model permits an accurate description of the data of two human cell lines (previously published) and of the multicellular spheroids of the MCF-7 line here measured. CONCLUSION The model shows enough flexibility to account for data with very different characteristics and considers in a faithful way the hypothesis of the repair induction.
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Affiliation(s)
- D Guirado
- Radiophysics Service, University Hospital San Cecilio, Granada, Spain
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Edin NJ, Olsen DR, Sandvik JA, Malinen E, Pettersen EO. Low dose hyper-radiosensitivity is eliminated during exposure to cycling hypoxia but returns after reoxygenation. Int J Radiat Biol 2012; 88:311-9. [DOI: 10.3109/09553002.2012.646046] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Gómez-Millán J, Katz ISS, Farias VDA, Linares-Fernández JL, López-Peñalver J, Ortiz-Ferrón G, Ruiz-Ruiz C, Oliver FJ, Ruiz de Almodóvar JM. The importance of bystander effects in radiation therapy in melanoma skin-cancer cells and umbilical-cord stromal stem cells. Radiother Oncol 2011; 102:450-8. [PMID: 22169765 DOI: 10.1016/j.radonc.2011.11.002] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2011] [Revised: 11/02/2011] [Accepted: 11/02/2011] [Indexed: 01/14/2023]
Abstract
PURPOSE To examine direct and bystander radiation-induced effects in normal umbilical-cord stromal stem cell (HCSSC) lines and in human cancer cells. MATERIALS AND METHODS The UCSSC lines used in this study were obtained in our laboratory. Two cell lines (UCSSC 35 and UCSSC 37) and two human melanoma skin-cancer cells (A375 and G361) were exposed to ionizing radiation to measure acute radiation-dosage cell-survival curves and radiation-induced bystander cell-death response. Normal cells, although extremely sensitive to ionizing radiation, were resistant to the bystander effect whilst tumor cells were sensitive to irradiated cell-conditioned media, showing a dose-response relationship that became saturated at relatively low doses. We applied a biophysical model to describe bystander cell-death through the binding of a ligand to the cells. This model allowed us to calculate the maximum cell death (χ(max)) produced by the bystander effect together with its association constant (K(By)) in terms of dose equivalence (Gy). The values obtained for K(By) in A375 and G361 cells were 0.23 and 0.29 Gy, respectively. CONCLUSION Our findings help to understand how anticancer therapy could have an additional decisive effect in that the response of sub-lethally hit tumor cells to damage might be required for therapy to be successful because the survival of cells communicating with irradiated cells is reduced.
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Affiliation(s)
- Jaime Gómez-Millán
- Hospital Universitario Virgen de la Victoria, Unidad de Gestión Clínica de Oncología, Málaga, Spain
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35
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Balducci M, Chiesa S, Diletto B, D'Agostino GR, Mangiola A, Manfrida S, Mantini G, Albanese A, Fiorentino A, Frascino V, De Bari B, Micciche' F, De Rose F, Morganti AG, Anile C, Valentini V. Low-dose fractionated radiotherapy and concomitant chemotherapy in glioblastoma multiforme with poor prognosis: a feasibility study. Neuro Oncol 2011; 14:79-86. [PMID: 21993440 DOI: 10.1093/neuonc/nor173] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
We explored the feasibility of concurrent palliative chemotherapy and low-dose fractionated radiotherapy (LD-FRT) in glioblastoma multiforme (GBM). Patients with recurrent/progressive GBM at least 3 months after the end of primary radiotherapy received 0.3 Gy twice daily with cisplatin and fotemustine if progressing on temozolomide, or 0.4 Gy twice daily with temozolomide if recurrent 4-6 months later (retreatment group). Newly diagnosed GBM with gross residual mass received 30 Gy with concomitant and adjuvant temozolomide and 0.4 Gy twice daily from the second adjuvant cycle (naive group) for 2-4 cycles. Twenty-six patients were enrolled. In the retreatment group (n = 17; median LD-FRT total dose 7.2 Gy [range 2.4-11.6]), grade 3 or 4 hematological toxicity was observed in 5.9% of patients. Median follow-up time was 20 months (range 4-35). Median progression-free survival (PFS) and overall survival (OS) from the time of recurrence or progression were 4 and 8 months, respectively (OS at 6 months, 69%; at 12 months, 16.7%). In the naive group (n = 9; median LD-FRT total dose 8 Gy [range 3.2-16]), grade 3 or 4 hematological toxicity was observed in 11.1% of patients. Median follow-up time was 17 months (range 8-20)-median PFS was 9 months, with PFS at 6 months and at 1 year of 66.7% and 26.7%, respectively; and median OS was 12 months, with OS at 6 months and at 1 year of 77.8% and 34.6%, respectively. LD-FRT with concurrent chemotherapy was well tolerated.
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Affiliation(s)
- Mario Balducci
- Department of Radiotherapy, Catholic University of the Sacred Heart, Rome, Italy
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36
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Beauchesne P, Bernier V, Carnin C, Taillandier L, Djabri M, Martin L, Michel X, Maire JP, Khalil T, Kerr C, Gorlia T, Stupp R, Pedeux R. Prolonged survival for patients with newly diagnosed, inoperable glioblastoma with 3-times daily ultrafractionated radiation therapy. Neuro Oncol 2010; 12:595-602. [PMID: 20511183 DOI: 10.1093/neuonc/noq008] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Ultrafractionation of radiation therapy is a novel regimen consisting of irradiating tumors several times daily, delivering low doses (<0.75 Gy) at which hyperradiosensitivity occurs. We recently demonstrated the high efficiency of ultrafractionated radiotherapy (RT) on glioma xenografts and report here on a phase II clinical trial to determine the safety, tolerability, and efficacy of an ultrafractionation regimen in patients with newly and inoperable glioblastoma (GBM). Thirty-one patients with histologically proven, newly diagnosed, and unresectable supratentorial GBM (WHO grade IV) were enrolled. Three daily doses of 0.75 Gy were delivered at least 4 hours apart, 5 days per week over 6-7 consecutive weeks (90 fractions for a total of 67.5 Gy). Conformal irradiation included the tumor bulk with a margin of 2.5 cm. The primary end points were safety, toxicity, and tolerability, and the secondary end points were overall survival (OS) and progression-free survival (PFS). Multivariate analysis was used to compare the OS and PFS with the EORTC-NCIC trial 26981-22981/CE.3 of RT alone vs radiation therapy and temozolomide (TMZ). The ultrafractionation radiation regimen was safe and well tolerated. No acute Grade III and/or IV CNS toxicity was observed. Median PFS and OS from initial diagnosis were 5.1 and 9.5 months, respectively. When comparing with the EORTC/NCIC trial, in both PFS and OS multivariate analysis, ultrafractionation showed superiority over RT alone, but not over RT and TMZ. The ultrafractionation regimen is safe and may prolong the survival of patients with GBM. Further investigation is warranted and a trial associating ultra-fractionation and TMZ is ongoing.
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Affiliation(s)
- Patrick Beauchesne
- Neuro-Oncologie - Neurologie, CHU de Nancy, Hôpital Central, CO no 34, 54035 Nancy Cedex, France.
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Valentini V, Massaccesi M, Balducci M, Mantini G, Micciché F, Mattiucci GC, Dinapoli N, Meduri B, D'Agostino GR, Salvi G, Nardone L. Low-Dose Hyperradiosensitivity: Is There a Place for Future Investigation in Clinical Settings? Int J Radiat Oncol Biol Phys 2010; 76:535-9. [DOI: 10.1016/j.ijrobp.2009.02.075] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2008] [Revised: 02/09/2009] [Accepted: 02/09/2009] [Indexed: 11/25/2022]
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Fernet M, Mégnin-Chanet F, Hall J, Favaudon V. Control of the G2/M checkpoints after exposure to low doses of ionising radiation: implications for hyper-radiosensitivity. DNA Repair (Amst) 2009; 9:48-57. [PMID: 19926348 DOI: 10.1016/j.dnarep.2009.10.006] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2009] [Revised: 10/09/2009] [Accepted: 10/13/2009] [Indexed: 10/20/2022]
Abstract
Two molecularly distinct G2/M cell cycle arrests are induced after exposure to ionising radiation (IR) depending on the cell cycle compartment in which the cells are irradiated. The aims of this study were to determine whether there are threshold doses for their activation and investigate the molecular pathways and possible links between the G2 to M transition and hyper-radiosensitivity (HRS). Two human glioblastoma cell lines (T98G-HRS(+) and U373-HRS(-)) unsynchronized or enriched in G2 were irradiated and flow cytometry with BrdU or histone H3 phosphorylation analysis used to assess cell cycle progression and a clonogenic assay to measure radiation survival. The involvement of ATM, Wee1 and PARP was studied using chemical inhibitors. We found that cells irradiated in either the G1 or S phase of the cell cycle transiently accumulate in G2 in a dose-dependent manner after exposure to doses as low as 0.2Gy. Only Wee1 inhibition reduced this G2 accumulation. A block of the G2 to M transition was found after irradiation in G2 but occurs only above a threshold dose, which is cell line dependent, and requires ATM activity after exposure to doses above 0.5Gy. A failure to activate this early G2/M checkpoint correlates with low dose radiosensitization. These results provide evidence that after exposure to low doses of IR two distinct G2/M checkpoints are activated, each in a dose-dependent manner, with distinct threshold doses and involving different damage signalling pathways and confirm links between the early G2/M checkpoint and hyper-radiosensitivity.
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Affiliation(s)
- Marie Fernet
- Institut Curie, Centre de Recherche, Bâtiment 110-112, Centre universitaire, Orsay, France.
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Ryan LA, Seymour CB, Mothersill CE. Investigation of non-linear adaptive responses and split dose recovery induced by ionizing radiation in three human epithelial derived cell lines. Dose Response 2009; 7:292-306. [PMID: 20011650 DOI: 10.2203/dose-response.09-003.mothersill] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Two almost completely exclusive fields in radiobiology deal with splitting doses of radiation and comparing the effect to a similar total dose given in one exposure. In radiotherapy, dose "fractionation" is used to "spare" normal tissue and in the low dose field, the adaptive response is well documented as a phenomenon where a small "priming" dose administered before the larger "challenge" dose reduces the effect of the large dose. There have been very few studies where these fields overlap, thus it is not possible to ascertain whether common or distinct mechanisms underlie both phenomena but this is certainly an interesting question and relevant to our understanding of high and low dose radiobiology. This paper presents data for three human cell lines with varying p53 status and radiation responses, treated at a range of times between first and second dose and for 3 different first doses (0.1, 0.5 and 2Gy). The data show that time between doses is critical. Protective (adaptive) effects were seen in each cell line but most prominently in the malignant HT 29 cell line. Surprisingly none of the cell lines showed pronounced split dose recovery. This suggests different mechanisms may underlie the two phenomena.
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Affiliation(s)
- Lorna A Ryan
- Medical Physics and Applied Radiation Sciences Department, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada
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Daşu A, Toma-Daşu I. Treatment modelling: the influence of micro-environmental conditions. Acta Oncol 2009; 47:896-905. [PMID: 18568485 DOI: 10.1080/02841860701716884] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The interest in theoretical modelling of radiation response has grown steadily from a fast method to estimate the gain of new treatment strategies to an individualisation tool that may be used as part of the treatment planning algorithms. While the advantages of biological optimisation of plans are obvious, accurate theoretical models and realistic information about the micro-environmental conditions in tissues are needed. This paper aimed to investigate the clinical implications of taking into consideration the details of the tumour microenvironmental conditions. The focus was on the availability of oxygen and other nutrients to tumour cells and the relationship between cellular energy reserves and DNA repair ability as this is thought to influence the response of the various hypoxic cells. The choice of the theoretical models for predicting the response (the linear quadratic model or the inducible repair model) was also addressed. The modelling performed in this project has shown that the postulated radiobiological differences between acute and chronic hypoxia have some important clinical implications which may help to understand the mechanism behind the current success rates of radiotherapy. The results also suggested that it is important to distinguish between the two types of hypoxia in predictive assays and other treatment simulations.
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Abstract
There is an increased interest in estimating the induction of cancers following radiotherapy as the patients have nowadays a much longer life expectancy following the treatment. Clinical investigations have shown that the dose response relationship for cancer induction following radiotherapy has either of two main characteristics: an increase of the risk with dose to a maximum effect followed by a decrease or an increase followed by a levelling-off of the risk. While these behaviours have been described qualitatively, there is no mathematical model that can explain both of them on mechanistic terms. This paper investigates the relationship between the shape of the dose-effect curve and the cell survival parameters of a single risk model. Dose response relationships were described with a competition model which takes into account the probability to induce DNA mutations and the probability of cell survival after irradiation. The shape of the curves was analysed in relation to the parameters that have been used to obtain them. It was found that the two main appearances of clinical data for the induction of secondary cancer following radiotherapy could be the manifestations of the particular sets of parameters that describe the induction of mutations and cell kill for fractionated irradiations. Thus, the levelling off appearance of the dose response curve could be either a sign of moderate to high inducible repair effect in cell survival (but weak for DNA mutations) or the effect of heterogeneity, or both. The bell-shaped appearance encompasses all the other cases. The results also stress the importance of taking into account the details of the clinical delivery of dose in radiotherapy, mainly the fractionated character, as the findings of our study did not appear for single dose models. The results thus indicate that the shapes of clinically observed dose response curves for the induction of secondary cancers can be described by using one single competition model. It was also found that data for cancer induction may be linked to in vivo cell survival parameters that may be used for other modelling applications.
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Affiliation(s)
- Alexandru Daşu
- Department of Radiation Sciences, Umeå University, 901 87, Umeå, Sweden.
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Caney C, Singh G, Lukka H, Rainbow AJ. Combined gamma‐irradiation and subsequent cisplatin treatment in human squamous carcinoma cell lines sensitive and resistant to cisplatin. Int J Radiat Biol 2009; 80:291-9. [PMID: 15204706 DOI: 10.1080/09553000410001679767] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
PURPOSE To investigate the effects of combined radiation and subsequent cisplatin treatment on the human squamous carcinoma cell line SCC-25 and its cisplatin-resistant derivative SCC-25/CP. MATERIALS AND METHODS SCC-25 and SCC-25/CP cells were treated with various gamma-ray doses (5 cGy-7 Gy) followed 60 min later by cisplatin treatment and subsequently assayed for survival using a conventional colony assay. For SCC-25, the subsequent cisplatin treatment was 0.1, 1, 10 and 20 microM for 1 h. For the more cisplatin-resistant SCC-25/CP cells, the subsequent cisplatin treatment was 10 and 50 microM for 1 h. RESULTS The cisplatin-resistant SCC-25/CP cells were not cross-resistant to gamma-irradiation. Subsequent treatment with an LD50 concentration of cisplatin (10 and 50 microM for SCC-25 and SCC-25/CP, respectively) resulted in radiosensitization for SCC-25/CP but not for SCC-25 cells. Gamma-irradiation of SCC-25/CP cells followed by treatment with 10 and 50 microM cisplatin for 1 h resulted in radiation survival curves displaying a significant low-dose hypersensitive region followed by increased radioresistance at higher doses. A total of 10 microM cisplatin resulted in radiosensitization confined to the low-dose region (0.05 and 0.25 Gy), whereas the higher cisplatin treatment of 50 microM resulted in the appearance of a hypersensitive region together with a reduction of the increased radioresistance region. In contrast, cisplatin treatment (0.1, 1, 10 and 20 microM for 1 h) of SCC-25 cells had no significant effect on survival following 2.5 or 7.0 Gy and actually resulted in an increased low-dose radiation survival (0.05, 0.25 and 1 Gy) when survival was corrected for cisplatin treatment (p<0.01 for all cisplatin concentrations tested). CONCLUSIONS The significant radiosensitization for SCC-25/CP given subsequent treatment with 50 microM cisplatin indicates cisplatin can inhibit the increased radioresistance response in SCC-25/CP cells. In contrast, the subsequent cisplatin treatment of SCC-25 cells can enhance their survival following low radiation doses.
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Affiliation(s)
- C Caney
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada
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The effect of radio-adaptive doses on HT29 and GM637 cells. Radiat Oncol 2008; 3:12. [PMID: 18433479 PMCID: PMC2387149 DOI: 10.1186/1748-717x-3-12] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2007] [Accepted: 04/23/2008] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND The shape of the dose-response curve at low doses differs from the linear quadratic model. The effect of a radio-adaptive response is the centre of many studies and well known inspite that the clinical applications are still rarely considered. METHODS We studied the effect of a low-dose pre-irradiation (0.03 Gy - 0.1 Gy) alone or followed by a 2.0 Gy challenging dose 4 h later on the survival of the HT29 cell line (human colorectal cancer cells) and on the GM637 cell line (human fibroblasts). RESULTS 0.03 Gy given alone did not have a significant effect on both cell lines, the other low doses alone significantly reduced the cell survival. Applied 4 h before the 2.0 Gy fraction, 0.03 Gy led to a significant induced radioresistance in GM637 cells, but not in HT29 cells, and 0.05 Gy led to a significant hyperradiosensitivity in HT29 cells, but not in GM637 cells. CONCLUSION A pre-irradiation with 0.03 Gy can protect normal fibroblasts, but not colorectal cancer cells, from damage induced by an irradiation of 2.0 Gy and the application of 0.05 Gy prior to the 2.0 Gy fraction can enhance the cell killing of colorectal cancer cells while not additionally damaging normal fibroblasts. If these findings prove to be true in vivo as well this may optimize the balance between local tumour control and injury to normal tissue in modern radiotherapy.
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Nuta O, Darroudi F. The impact of the bystander effect on the low-dose hypersensitivity phenomenon. RADIATION AND ENVIRONMENTAL BIOPHYSICS 2008; 47:265-274. [PMID: 18189143 DOI: 10.1007/s00411-007-0145-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2007] [Accepted: 11/19/2007] [Indexed: 05/25/2023]
Abstract
The aim of this study was to investigate the possible relationship between the bystander effect and the low-dose hypersensitivity/increased radio-resistance phenomenon in BJ fibroblast cells taking as response criteria different end points of radiation damage such as cell survival, chromosomal damage (as detected by using micronucleus assay) and double strand breaks (DSBs) of the DNA. Although gamma-H2AX foci were observed in confluent bystander BJ cells, our data suggest that X-irradiation does not lead to a significant rate of DSBs in bystander cells. Thus, neither bystander effect induced unstable chromosomal aberrations nor bystander effect induced DSBs are sufficiently pronounced to explain the apparent relationship between bystander effect and low-dose hypersensitivity. The experiments described here suggest that the hyper-radiosensitivity phenomenon might be related to bystander factor induced cell inactivation in the low-dose region (lower than 1 Gy).
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Affiliation(s)
- Otilia Nuta
- Department of Toxicogenetics, Leiden University Medical Center, Einthovenweg 20, PO Box 9600, 2300 RC Leiden, The Netherlands.
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Thomas P, Tracy B, Ping T, Baweja A, Wickstrom M, Sidhu N, Hiebert L. Relative biological effectiveness (RBE) of alpha radiation in cultured porcine aortic endothelial cells. Int J Radiat Biol 2007; 83:171-9. [PMID: 17378525 DOI: 10.1080/09553000601146915] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
PURPOSE Northern peoples can receive elevated radiation doses (1- 10 mSv/y) from transfer of polonium-210 (210Po) through the lichen-caribou-human food chain. Ingested 210Po is primarily blood-borne and thus many of its short range alpha particles irradiate the endothelial cells lining the blood vessels. The relative biological effectiveness (RBE) of alpha particles vs. x-rays was examined in porcine aortic endothelial cells as a surrogate for understanding what might happen to human endothelial cells in northern populations consuming traditional foods. MATERIALS AND METHODS Cultured porcine aortic endothelial cells were exposed to x-ray and 210Po alpha particle radiation. Alpha irradiation was applied to the cell cultures internally via the culture medium and externally, using thin-bottomed culture dishes. The results given here are based on the external irradiation method, which was found to be more reliable. Dose-response curves were compared for four lethal endpoints (cell viability, live cell fraction, release of lactate dehydrogenase [LDH] and clonogenic survival) to determine the relative biological effectiveness (RBE) of alpha radiation. RESULTS The alpha RBE for porcine cells varied from 1.6-21, depending on the endpoint: 21.2+/-4.5 for cell viability, 12.9+/-2.7 for decrease in live cell number, 5.3+/-0.4 for LDH release to the medium but only 1.6 +/-0.1 for clonogenic survival. The low RBE of 1.6 was due to x-ray hypersensitivity of endothelial cells at low doses.
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Affiliation(s)
- Patricia Thomas
- Toxicology Centre, University of Saskatchewan, Saskatoon, Saskatchewan
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Wang HP, Long XH, Sun ZZ, Rigaud O, Xu QZ, Huang YC, Sui JL, Bai B, Zhou PK. Identification of differentially transcribed genes in human lymphoblastoid cells irradiated with 0.5 Gy of gamma-ray and the involvement of low dose radiation inducible CHD6 gene in cell proliferation and radiosensitivity. Int J Radiat Biol 2006; 82:181-90. [PMID: 16638715 DOI: 10.1080/09553000600632261] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
PURPOSE To identify candidate genes specifically involved in response to low-dose irradiation in human lymphoblastoid cells; to better clarify the role of the human chromodomain helicase DNA binding protein 6 gene (CHD6), one of these genes, in cell proliferation and radiosensitivity. MATERIALS AND METHODS DNA microarray technology was used to analyse global transcriptional profile in human lymphoblastoid AHH-1 cells at 4 h after exposure to 0.5 Gy of gamma-ray. Gene expression changes were confirmed by semi-quantitative reverse transcription--polymerase chain reaction (RT-PCR) and Northern blot. RNA interfering technology was employed to knock-down the CHD6 gene in A549 cells. Colony-forming ability was used to analyse radiosensitivity. RESULTS The microarray assay revealed a set of 0.5 Gy-responsive genes, including 30 up-regulated genes and 45 down-regulated genes. The up-regulated genes include a number of genes involved in: signal transduction pathways, e.g., STAT3, CAMKK2, SIRT1, CREM, MAPK3K7IP2 and GPR56; transcription or DNA-binding, e.g., CHD6, CRSP3, SNURF, SH2 domain binding protein 1 and MIZF. Some of the down-regulated genes are involved in: cytoskeleton and cell movement (WASF2, LCP1, MSN, NIPSNAP1, KIF2C); DNA replication and repair (MCM2, MCM3, MCM7 and XRCC-4). Radiation-increased expression of CHD6 was also found in A549 cells and HeLa cells. The sustained CHD6 induction was restricted to relatively low doses (0.2 Gy or 0.5 Gy), no change occurring after 4 Gy irradiation. Silencing of CHD6 mediated by siRNA increased the growth rate of A549 cells by 40 approximately 60%. Most importantly, silencing CHD6 led to an increased radioresistance of A459 cells to radiation doses up to 2 Gy, but barely affected the sensitivity of cells at 4 and 8 Gy. CONCLUSION This study has identified a set of genes responsive to 0.5 Gy of gamma-rays. CDH6 gene can be specifically up-regulated by low dose irradiation, and its inducible expression could be involved in a low dose hypersensitive response.
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Affiliation(s)
- H P Wang
- Department of Radiation Toxicology and Oncology, Beijing Institute of Radiation Medicine, Beijing, PR China
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Lin PS, Wu A. Not all 2 gray radiation prescriptions are equivalent: Cytotoxic effect depends on delivery sequences of partial fractionated doses. Int J Radiat Oncol Biol Phys 2005; 63:536-44. [PMID: 16168846 DOI: 10.1016/j.ijrobp.2005.06.010] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2004] [Revised: 05/27/2005] [Accepted: 06/01/2005] [Indexed: 10/25/2022]
Abstract
PURPOSE To test whether or not the commonly prescribed daily dose of 2 Gy (whole fraction), when delivered as various partial fraction (PF) dose sequences simulating clinical treatment fields, produces equal biologic effects. METHODS AND MATERIALS Eleven actively proliferating cell lines derived from human and animal tissues were used in this study. 3-(4,5-dimethylthiazol-2-yl)-2,5 diphenyltetrazolium bromide (MTT) and clonogenic assays were used to determine the radiation effects on cell proliferation and survival, respectively. The 2 Gy dose was divided into 2 or more PFs for delivery to simulate the delivery of clinical treatment fields. Most irradiation sequences contained two parts consisting of at least 1 small PF, denoted by S which was 0.5 Gy or less, and a large PF, denoted by L which was 1 Gy or more. Irradiation schemes were designed to include the following conditions: (a) the 2 Gy dose divided into combinations of an L-dose and one or more S-doses; (b) the L-dose given either before or after the S-doses; and (c) delivery of all partial fractions within a fixed total time. RESULTS Significant differences in biologic effect were observed between sequences in which the L-dose was given before or after the S-doses in both the MTT and clonogenic assays. Nearly all the latter schemes, that is S-L, produced greater cytotoxic effects than the L-S schemes. CONCLUSIONS These data demonstrate that the biologic effects of 2 Gy may differ in different clinical settings depending on the size and sequence of the partial fractions. The variation between cytotoxic effects is likely a result of the combination of low-dose hyper-radiosensitivity (HRS) and higher-dose increased radioresistance (IRR) effects established recently. We suggest that to ensure the optimal biologic effect of a prescribed dose of 2 Gy clinically, it is critical to consider the sequence in which the treatment fields are delivered when partial fractions of different sizes are used.
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Affiliation(s)
- Peck-Sun Lin
- Department of Radiation Oncology, Virginia Commonwealth University, 401 College Street, Richmond, VA 23298, USA.
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Schaffer M, Schwarz SB, Kulka U, Busch M, Dühmke E. Adaptive doses of irradiation-an approach to a new therapy concept for bladder cancer? RADIATION AND ENVIRONMENTAL BIOPHYSICS 2004; 43:271-276. [PMID: 15455244 DOI: 10.1007/s00411-004-0256-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2004] [Accepted: 08/05/2004] [Indexed: 05/24/2023]
Abstract
Radiation adaptive response in terms of induced radioresistance or hyperradiosensitivity, has been studied in HCV29 (human bladder epithelium) and RT4 (human bladder carcinoma) cell lines. After pre-irradiation doses of 0.05 Gy or 0.1 Gy, HCV29 cells showed induced radioresistance, whereas after pre-irradiation doses of 0.05 Gy, 0.1 Gy, 0.2 Gy, and 0.5 Gy, the RT4 cells clearly showed hyperradiosensitivity. On the basis of these results, an approach has been developed that may lead to a concept for a new radiotherapeutic regimen of bladder cancer that includes protection of normal cells, on the one hand, and the potential of tumor cell damage, on the other hand. These findings need to be confirmed in further studies for the benefit of the patients.
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Affiliation(s)
- Moshe Schaffer
- Department of Radiation Therapy and Radiation Oncology, University of Munich, Marchioninistrasse 15, 81377 Munich, Germany
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Borkenstein K, Levegrün S, Peschke P. Modeling and computer simulations of tumor growth and tumor response to radiotherapy. Radiat Res 2004; 162:71-83. [PMID: 15222799 DOI: 10.1667/rr3193] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
A model of tumor growth and tumor response to radiation is introduced in which each tumor cell is taken into account individually. Each cell is assigned a set of radiobiological parameters, and the status of each cell is checked in discrete intervals. Tumor proliferation is governed by the cell cycle times of tumor cells, the growth fraction, the apoptotic capacity of the tumor, and the degree of tumor angiogenesis. The response of tumor cells to radiation is determined by the radiosensitivities and the oxygenation status. Computer simulation is performed on a 3D rigid cubic lattice, starting out from a single tumor cell. Random processes are simulated by Monte Carlo methods. Short cell cycle time, high growth fraction, and tumor angiogenesis all increase tumor proliferation rates. Accelerated time-dose patterns result in lower total doses needed for tumor control, but the extent of dose reduction depends on the kinetics and the radiosensitivities of tumor cells. Tumor angiogenesis alters fully oxygenated and hypoxic fractions within the tumor and subsequently affects the radiation response. It is demonstrated for selected radiobiological parameters that the simulation tools are suitable to quantitatively assess the total doses needed for tumor control. Using the simulation tools, it is feasible to simulate time-dependent effects during fractionated radiotherapy and to compare different time-dose patterns in terms of their tumor control.
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Affiliation(s)
- Klaus Borkenstein
- Department of Medical Physics, Deutsches Krebsforschungszentrum, Heidelberg, Germany.
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Krause M, Hessel F, Wohlfarth J, Zips D, Hoinkis C, Foest H, Petersen C, Short SC, Joiner MC, Baumann M. Ultrafractionation in A7 human malignant glioma in nude mice. Int J Radiat Biol 2003; 79:377-83. [PMID: 12963539 DOI: 10.1080/0955300031000140775] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
PURPOSE Low-dose hyperradiosensitivity (HRS) has been demonstrated in numerous cell lines in vitro, including a number of radioresistant human malignant glioma cell lines such as A7. The aim of our experiment was to show whether HRS can be exploited by using ultrafractionated irradiation (UF) to improve local control of A7 tumours growing in nude mice. Extrapolation of the in vitro results predict a 3.7-fold difference in the efficacy of UF compared with conventional fractionation (CF). MATERIAL AND METHODS Subcutaneuously growing A7 tumours were irradiated either with UF (126 fractions in 6 weeks, 0.4 Gy per fraction) or CF (30 fractions in 6 weeks, 1.68 Gy per fraction). The total dose was 50.4 Gy in both experimental arms. Fractionated irradiations were given under ambient conditions and followed by graded top-up doses under clamp hypoxia. Endpoints were tumour growth delay and local tumour control 180 days after the end of treatment. RESULTS UF resulted in a significant decrease of tumour growth delay and in a significant increase of the top-up TCD(50) compared with CF (40.0 Gy [95% CI 29; 61 Gy] versus 28.3 Gy [24; 35 Gy], p=0.047). CONCLUSIONS Despite a pronounced HRS phenomenon in vitro, UF was significantly less effective than CF in A7 human malignant glioma in nude mice. These results neither disprove the existence of HRS nor do they exclude a possible clinical value of UF. The findings rather indicate that simplistic extrapolation from results obtained after single-dose exposure or few fractions in vitro is not sufficient to predict outcome of UF in vivo and that comprehensive evaluation of novel treatment options in animal models continues to be an essential requirement for clinical translation.
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Affiliation(s)
- M Krause
- Clinic for Radiotherapy and Radiation Oncology, University of Technology, Dresden, Germany
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