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Coultas PG, Hopewell JW. Dr Tikvah Alper: a short history of her scientific career. Int J Radiat Biol 2021; 98:314-317. [PMID: 34846231 DOI: 10.1080/09553002.2021.2009148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
PURPOSE This article can only skim the surface of an extraordinary career of Dr Alper from the early days in South Africa and throughout her life. CONCLUSIONS She overcame many obstacles to become widely acknowledged as having had an immense effect on the study of radiation biology. Her very considerable personal scientific achievements in no way prevented her from taking time to help and inspire others in the field as well as maintaining a long and happy family life. If an example is needed to show what can be achieved with a combination of total intellectual integrity and determined application, then Tikvah Alper certainly provided this.
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Affiliation(s)
- Peter G Coultas
- Formally of MRC Cyclotron Unit, Hammersmith Hospital, London, UK
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Lockney NA, Zhang M, Morris CG, Nichols RC, Okunieff P, Swarts S, Zhang Z, Zhang B, Zhang A, Hoppe BS. Radiation-induced tumor immunity in patients with non-small cell lung cancer. Thorac Cancer 2019; 10:1605-1611. [PMID: 31228354 PMCID: PMC6610279 DOI: 10.1111/1759-7714.13122] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 05/22/2019] [Accepted: 05/22/2019] [Indexed: 01/19/2023] Open
Abstract
Background Radiation‐induced tumor immunity (RITI) influences primary tumor growth and development of metastases in preclinical cancer models with conventional radiotherapy. Antigen‐specific immune responses have also been shown for prostate cancer treated with radiotherapy. We examined whether RITI can be induced in patients with non‐small cell lung cancer (NSCLC) following proton radiotherapy. Methods Pre‐ and post‐radiotherapy plasma samples from 26 patients with nonmetastatic NSCLC who received radiotherapy between 2010 and 2012 were evaluated by western blotting for IgG and IgM bands to assess RITI response to tumor antigens from lung cancer cell lines. Statistical analysis was used to evaluate any correlation among IgG or IgM and clinical outcomes. Results Twenty‐one patients received proton therapy at 2 GyRBE/fraction (n = 17) or 6–12 Gy/fraction (n = 4); five received photon therapy at 2–2.5 GyRBE/fraction. Compared with the pretreatment baseline, new IgG or IgM binding was detected in 27% and 50% of patients, respectively. New IgG bands were detected in the 25–37 kD, 50–75 kD, and 75–100 kD ranges. New IgM bands were detected in the 20–25 kD, 25–37 kD, 37–50 kD, 50–75 kD, and 75–100 kD ranges. There was no difference in IgG and/or IgM RITI response in patients treated with photons versus protons, or in patients who received SBRT compared to standard fractionation (P > 0.05). There was no difference in overall survival, metastasis‐free survival, or local control based on IgG and/or IgM RITI response (P > 0.05). Conclusion RITI can be induced in patients with NSCLC through upregulated IgG and/or IgM. RITI response was not associated with proton versus photon therapy or with clinical outcomes in this small cohort and should be examined in a larger cohort in future studies.
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Affiliation(s)
- Natalie A Lockney
- Department of Radiation Oncology, University of Florida, Gainesville, USA
| | - Mei Zhang
- Department of Radiation Oncology, University of Florida, Gainesville, USA
| | | | | | - Paul Okunieff
- Department of Radiation Oncology, University of Florida, Gainesville, USA
| | - Steven Swarts
- Department of Radiation Oncology, University of Florida, Gainesville, USA
| | - Zhenhuan Zhang
- Department of Radiation Oncology, University of Florida, Gainesville, USA
| | - Bingrong Zhang
- Department of Radiation Oncology, University of Florida, Gainesville, USA
| | - Amy Zhang
- Department of Radiation Oncology, University of Florida, Gainesville, USA
| | - Bradford S Hoppe
- Department of Radiation Oncology, University of Florida, Gainesville, USA
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Burgio E, Piscitelli P, Migliore L. Ionizing Radiation and Human Health: Reviewing Models of Exposure and Mechanisms of Cellular Damage. An Epigenetic Perspective. Int J Environ Res Public Health 2018; 15:E1971. [PMID: 30201914 DOI: 10.3390/ijerph15091971] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 09/03/2018] [Accepted: 09/04/2018] [Indexed: 11/16/2022]
Abstract
We reviewed available evidence in medical literature concerning experimental models of exposure to ionizing radiations (IR) and their mechanisms of producing damages on living organisms. The traditional model is based on the theory of “stochastic breakage” of one or both strands of the DNA double helix. According to this model, high doses may cause the breaks, potentially lethal to the cell by damaging both DNA strands, while low doses of IR would cause essentially single strands breaks, easily repairable, resulting in no permanent damages. The available evidence makes this classical model increasingly less acceptable, because the exposure to low doses of IR seems to have carcinogenic effects, even after years or decades, both in the exposed individuals and in subsequent generations. In addition, the cells that survived the exposure to low doses, despite being apparently normal, accumulate damages that become evident in their progeny, such as nonclonal chromosomal aberrations, which can be found even in cells not directly irradiated due to the exchange of molecular signals and complex tissue reactions involving neighboring or distant cells. For all these reasons, a paradigm shift is needed, based on evidence and epigenetics.
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Sollazzo A, Shakeri-Manesh S, Fotouhi A, Czub J, Haghdoost S, Wojcik A. Interaction of low and high LET radiation in TK6 cells-mechanistic aspects and significance for radiation protection. J Radiol Prot 2016; 36:721-735. [PMID: 27631423 DOI: 10.1088/0952-4746/36/4/721] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Most environmental, occupational and medical exposures to ionising radiation are associated with a simultaneous action of different radiation types. An open question remains whether radiations of different qualities interact with each other to yield effects stronger than expected based on the assumption of additivity. It is possible that DNA damage induced by high linear energy transfer (LET) radiation will lead to an opening of the chromatin structure making the DNA more susceptible to attack by reactive oxygen species (ROS) generated by the low LET radiation. In such case, the effect of mixed beams should be strongly expressed in cells that are sensitive to ROS. The present investigation was carried out to test if cells with an impaired capacity to handle oxidative stress are particularly sensitive to the effect of mixed beams of alpha particles and x-rays. Clonogenic cell survival curves and mutant frequencies were analysed in TK6 wild type (wt) cells and in TK6 cells with a knocked down hMYH glycosylase. The results showed a synergistic effect of mixed beams on clonogenic cell survival of TK6wt but not TK6MYH- cells. The frequencies of mutants showed a high degree of interexperimental variability without any indications for synergistic effects of mixed beams. TK6MYH- cells were generally more tolerant to radiation exposure with respect to clonogenic cell survival but showed a strong increase in mutant frequency. The results demonstrate that exposure of wt cells to a mixed beam of alpha particles and x-rays leads to a detrimental effect which is stronger than expected based on the assumption of additivity. The role of oxidative stress in the reaction of cells to mixed beams remains unclear.
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Affiliation(s)
- Alice Sollazzo
- MBW Department, Centre for Radiation Protection Research, Stockholm University, Sweden
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Elgqvist J, Frost S, Pouget JP, Albertsson P. The potential and hurdles of targeted alpha therapy - clinical trials and beyond. Front Oncol 2014; 3:324. [PMID: 24459634 PMCID: PMC3890691 DOI: 10.3389/fonc.2013.00324] [Citation(s) in RCA: 111] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Accepted: 12/19/2013] [Indexed: 01/23/2023] Open
Abstract
This article presents a general discussion on what has been achieved so far and on the possible future developments of targeted alpha (α)-particle therapy (TAT). Clinical applications and potential benefits of TAT are addressed as well as the drawbacks, such as the limited availability of relevant radionuclides. Alpha-particles have a particular advantage in targeted therapy because of their high potency and specificity. These features are due to their densely ionizing track structure and short path length. The most important consequence, and the major difference compared with the more widely used β−-particle emitters, is that single targeted cancer cells can be killed by self-irradiation with α-particles. Several clinical trials on TAT have been reported, completed, or are on-going: four using 213Bi, two with 211At, two with 225Ac, and one with 212Pb/212Bi. Important and conceptual proof-of-principle of the therapeutic advantages of α-particle therapy has come from clinical studies with 223Ra-dichloride therapy, showing clear benefits in castration-resistant prostate cancer.
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Affiliation(s)
- Jörgen Elgqvist
- IRCM, Institut de Recherche en Cancérologie de Montpellier , Montpellier , France ; INSERM, U896 , Montpellier , France ; Université Montpellier 1 , Montpellier , France ; Institut Régional de Cancérologie de Montpellier , Montpellier , France
| | - Sofia Frost
- Fred Hutchinson Cancer Research Center , Seattle, WA , USA
| | - Jean-Pierre Pouget
- IRCM, Institut de Recherche en Cancérologie de Montpellier , Montpellier , France ; INSERM, U896 , Montpellier , France ; Université Montpellier 1 , Montpellier , France ; Institut Régional de Cancérologie de Montpellier , Montpellier , France
| | - Per Albertsson
- Department of Oncology, University of Gothenburg , Gothenburg , Sweden
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Abstract
Zamenhof, Stephen (University of California, Los Angeles), Hela Bursztyn, T. K. Ramachandra Reddy, and Patrice J. Zamenhof. Genetic factors in radiation resistance of Bacillus subtilis. J. Bacteriol. 90:108-115. 1965.-A study of several wild cross-transformable strains of Bacillus subtilis revealed differences in the resistance of their spores to X rays. Closer study of two such strains revealed differences of the same type when vegetative cells were exposed to X rays or to ultraviolet light (UV). Cell cultures repeatedly exposed to sublethal doses of UV (with cultivation between exposures) became more resistant to UV, presumably by enrichment in a more UV-resistant mutant. A sulfanilamide-resistant mutant of one strain (vegetative cells and spores) was less resistant to ionizing radiation; this sensitivity was transferable by transformation. No difference in radiation-induced mutability could be demonstrated in any of the strains studied. It is concluded that, at least in the cases studied, (i) the differences in radiation resistance of spores of different strains are not just a result of a superimposition of a common spore resistance mechanism(s) but rather are an amplification of genetically determined resistance differences in vegetative cells of these strains; (ii) sulfanilamide-resistance locus (p-aminobenzoic acid overproduction locus) is one of the loci of radiation sensitivity; (iii) no evidence was obtained that the differences in radiation resistance of cells or spores can be ascribed to differences in radiation resistance of their deoxyribonucleic acid.
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Affiliation(s)
- S Zamenhof
- Department of Biochemistry, Columbia University, New York, New York
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Abstract
Ionising radiation has been an important part of cancer treatment for almost a century, being used in external-beam radiotherapy, brachytherapy, and targeted radionuclide therapy. At the molecular and cellular level, cell killing has been attributed to deposition of energy from the radiation in the DNA within the nucleus, with production of DNA double-strand breaks playing a central part. However, this DNA-centric model has been questioned because cell-death pathways, in which direct relations between cell killing and DNA damage diverge, have been reported. These pathways include membrane-dependent signalling pathways and bystander responses (when cells respond not to direct radiation exposure but to the irradiation of their neighbouring cells). New insights into mechanisms of these responses coupled with technological advances in targeting of cells in experimental systems with microbeams have led to a reassessment of the model of how cells are killed by ionising radiation. This review provides an update on these mechanisms.
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Affiliation(s)
- Kevin M Prise
- Gray Cancer Institute, Mount Vernon Hospital, PO Box 100, Northwood, Middlesex HA6 2JR, UK.
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Abstract
This review looks at the emerging field of nontargeted radiation effects and their impact on low-dose radiation risk assessment and radiotherapy. It identifies the major role of experimental hematologists and cytogeneticists in changing the old view of radiation action on living things. It also considers the history of radiobiology, seeking to explain why it is only now that we are considering indirect or nontargeted effects of low doses even though the evidence was there, though buried, in the old literature. Effects receiving major attention worldwide now include genomic instability and bystander effects. The impact of these effects, both on radiotherapy used to treat cancer and on radiation induction of cancer, still need to be clarified. Techniques developed by experimental hematologists are central to these efforts and have been instrumental in causing radiobiologists to consider that a paradigm shift is necessary. Throughout, we make a plea to think "outside the box" since the very construction of a framework necessarily limits our thinking and our experimental design.
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Affiliation(s)
- Carmel Mothersill
- Radiation and Environmental Science Centre, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland.
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Abstract
A survey is made of literature data dealing with the influence of oxygen on radiation effects in biologically active DNA and enzymes irradiated extracellularly. There is evidence that oxygen takes part in physico-chemical events, directly or indirectly produced by radiation in several ways: from scavenging reducing primary water radicals to reacting directly with macromolecular radical sites. There is evidence that radiation-induced secondary radicals, originating from a variety of low molecular weight biomolecules, can react with DNA and enzymes in their native state, and produce inactivation. By reaction with oxygen secondary radicals become peroxidized and in this form are generally more harmful to biological macromolecules. There are indications that thiol peroxy radicals can also act in the same way. Possible implications for the oxygen effect observed in vivo are discussed.
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Szumiel I. Intrinsic Radiosensitivity of Proliferating Mammalian Cells. ACTA ACUST UNITED AC 1981. [DOI: 10.1016/b978-0-12-035409-2.50012-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2023]
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Ewing D. Long-lived oxygen-dependent damage in bacterial spores irradiated at conventional dose rates. Int J Radiat Biol Relat Stud Phys Chem Med 1980; 38:685-9. [PMID: 7009460 DOI: 10.1080/09553008014551521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Koukalová B, Kuhrová V. Damage to E. coli cells induced by tritium decay: secondary lethality under nongrowth conditions. Int J Radiat Biol Relat Stud Phys Chem Med 1980; 37:537-46. [PMID: 6995365 DOI: 10.1080/09553008014550671] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Cells containing incorporated 3H-thymidine are damaged by its decay. It was found with E. coli TAU-bar cells that a small part of the damage is lethal whereas most of it is reparable and only potentially lethal. If cells are subjected to nongrowth conditions, the potentially lethal damage changes to lethal damage. This process is called secondary lethality (SL). The extent of SL and some changes in DNA under three different modes of growth inhibition were determined. It was found that: (i) SL is maximal under conditions of amino acid starvation (-AA), the viable count decreasing by two orders of magnitude. (ii) SL is 4 times lower in the presence of chloramphenicol (-AA + CLP) and 6.5 times lower under + AA + CLP conditions. Changes in the sedimentation rate of DNA determined in alkaline sucrose gradient correlate with the differences in SL: under -AA conditions the sedimentation rate of DNA decreases whereas in the presence of CLP no decrease occurs. The results suggest that certain enzymatic processes take place under -AA conditions which lead to irreparable changes in DNA.
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Gillies NE, Obioha FI, Ratnajothi NH. An oxygen dependent X-ray lesion in Escherichia coli strain B/r detected by penicillin. Int J Radiat Biol Relat Stud Phys Chem Med 1979; 36:587-94. [PMID: 399950 DOI: 10.1080/09553007914551411] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Enhancement of lethal damage to E. coli B/r by penicillin was observed after X-irradiation under aerobic conditions but not after exposure to X-rays under anoxia or after U.V. (260 nm). No enhancement of damage occurred when incubation with penicillin was delayed for 2 hours after aerobic X-irradiation. This enhancing effect was only detected in this strain and not in the filamentous strain E. coli B. It is concluded that an X-ray induced lesion, sensitive to the presence of oxygen at the time of irradiation and probably located in the cell envelope, initiates filamentation in E. coli B/r, which results in lethal damage in this strain.
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McConnell VA, Shepstone BJ. Influence of oxygen tension on X-ray-induced fall in anodic mobility of Ehrlich ascites tumour cells irradiated in vitro. Int J Radiat Biol Relat Stud Phys Chem Med 1978; 34:391-6. [PMID: 309875 DOI: 10.1080/09553007814551041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Abstract
We investigated the influence of amino-acidless treatments applied prior and after UV irradiation (AA-irradiated AA+; AA-irradiated A-; AA+ irradiated AA-) on survival, dimer excision, postirradiation DNA degradation, DNA synthesis and sedimentation profiles of parental DNA of E. coli B/r Hcr+ cells. In dependence on the treatment applied, the fluence 50 J/m2 yielded distinctly different fractions of survivors within 0,03-85%. In all cases dimers were completely excised. The rate of DNA degradation was similar during a 30-40 min period after UV during which the bulk of dimers was excised. Degradation ceased, however, earlier in the prestarved cells than in exponentially growing ones; it was prolonged by aminoacidless postincubation. Sedimentation profiles of parental DNA did not differ during the whole period of dimer excision. In AA+ AA- cells DNA synthesis was not restored for several hours after addition of amino acids. In AA- AA- cells addition of amino acids resulted in a fast resumption of DNA synthesis. We conclude that removal of dimers and repair of gaps were similar in all cases. We believe that aminoacidless treatments influence production and repair of damage to the sites of DNA replication. The treatment appears to prevent this damage when applied before UV irradiation, but interferes with its restoration when applied after UV irradiation. Consequently, the former treatment increases survival of cells while the latter produces an opposite effect.
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Abstract
Radiation-induced cell death is probably mediated primarily through deposition of energy, in single events, in a few vital macromolecules, or targets, the integrity of which is indispensable for proliferation. The genome is customarily regarded as the main target, but several lines of evidence support the inference that there are important consequences of events in nuclear membranes in eukaryotes, and plasma membrane in bacteria. The identification of a target depends to some extent on parallelism between modifications of biological damage to putative targets and to the cell as a whole. An important modifying procedure is removal of oxygen from the irradiated system. The presence of oxygen almost always sensitizes cells, but when model systems with biological function are irradiated extra-cellularly a high degree of sensitization by oxygen has been observed only with those in which membrane function is important. This makes sense because the lipid content of membranes renders them readily peroxidizable. When the quality of the radiation is changed, its effectiveness changes in opposite directions for subcellular model targets and for cells. This could be accounted for if interactions between lesions in membranes and in attached DNA play a substantial role in cellular radiation effects.
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Alper T. Closing Lecture — Modern Trends and Creeds in Radiobiology. In: Kiefer J, editor. Radiation and Cellular Control Processes. Berlin: Springer Berlin Heidelberg; 1976. pp. 307-18. [DOI: 10.1007/978-3-642-66455-7_38] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Proceedings of The British Institute of Radiology. Br J Radiol 1975; 48:413-417. [DOI: 10.1259/0007-1285-48-569-413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Wangenheim KH. A major component of the radiation effect: interference with endocellular control of cell proliferation and differentiation. Int J Radiat Biol Relat Stud Phys Chem Med 1975; 27:7-30. [PMID: 1078819 DOI: 10.1080/09553007514550021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Cytological investigations with diploid and autotetraploid plant materials reveal that cytoplasmic growth, including the propagation of autoreduplicating cytoplasmic units such as mitochondria and proplastids, continues during the radiation-induced mitotic delay, thus increasing the ratio of cytoplasmic amount: nuclear ploidy. In accordance with a control mechanism, detected in the plant endosperm, this increase causes mitotic inhibition due to any early induction of otherwise normal differentiation processes. Although mutations are not a prerequisite, they can act in an auxiliary manner by quantitative action. The contribution of 'early differentiation' to non-survival varies according to irradiation conditions and can outweigh the direct effects of irreversible genetic damage. Therefore, a higher level of ploidy cannot improve survival significantly, if mitotically-active tissues are irradiated under the usual conditions. Corresponding observations are known from animals. The results suggest that the control mechanism of the endosperm is (a) general to multicellular organisms, and (b) can be modulated by extracellular agents.
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Cramp WA, Petrusek R. The synthesis of DNA by membranes-DNA complexes from E. coli B-r and E. coli Bs-1 after exposure to u.v. light; a comparison with the effects of ionizing radiation. Int J Radiat Biol Relat Stud Phys Chem Med 1974; 26:277-84. [PMID: 4609939 DOI: 10.1080/09553007414551241] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Proceedings of The British Institute of Radiology. Br J Radiol 1974; 47:239-241. [DOI: 10.1259/0007-1285-47-556-239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Hatzfeld J. Correlation between degradation, replication and repair of yeast DNA irradiated by ultraviolet or -rays. Biochim Biophys Acta 1973; 299:43-53. [PMID: 4573527 DOI: 10.1016/0005-2787(73)90396-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Watkins DK, Deacon S. Comparative effects of electron and neutron irradiation on the release of enzymes from isolated rat-spleen lysosomes. Int J Radiat Biol Relat Stud Phys Chem Med 1973; 23:41-50. [PMID: 4345999 DOI: 10.1080/09553007314550041] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Yatvin MB, Wood PG, Brown SM. "Repair" of plasma membrane injury and DNA single strand breaks in -irradiated Escherichia coli B-r and B S . Biochim Biophys Acta 1972; 287:390-403. [PMID: 4565733 DOI: 10.1016/0005-2787(72)90283-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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McNally NJ. A low oxygen-enhancement ratio for tumour-cell survival as compared with that for tumour-growth delay. Int J Radiat Biol Relat Stud Phys Chem Med 1972; 22:407-10. [PMID: 4541788 DOI: 10.1080/09553007214551281] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Ganesan AK, Smith KC. Requirement for protein synthesis in rec-dependent repair of deoxyribonucleic acid in Escherichia coli after ultraviolet or X irradiation. J Bacteriol 1972; 111:575-85. [PMID: 4559738 PMCID: PMC251320 DOI: 10.1128/jb.111.2.575-585.1972] [Citation(s) in RCA: 42] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Deprivation of amino acids required for growth or treatment with chloramphenicol or puromycin after irradiation reduced the survival of Rec(+) cells of Escherichia coli K-12 which had been exposed to either ultraviolet (UV) or X radiation. In contrast, these treatments caused little or no reduction in the survival of irradiated recA or recB mutants. The effect of chloramphenicol on the survival of X-irradiated cells was correlated with an inhibition of repair of single-strand breaks in irradiated deoxyribonucleic acid (DNA), previously shown to be controlled by recA and recB. In UV-irradiated cells no effect of chloramphenicol was detected on the repair of single-strand discontinuities in DNA replicated from UV-damaged templates, a process controlled by recA but not by recB. From this we concluded that inhibiting protein synthesis in UV or X-irradiated cells may interfere with some biochemical step in repair dependent upon the recB gene. When irradiated Rec(+) cells were cultured for a sufficient period of time in minimal growth medium before chloramphenicol treatment their survival was no longer decreased by the drug. After X irradiation this occurred in less than one generation time of the unirradiated control cells. After UV irradiation it occurred more slowly and was only complete after several generation times of the unirradiated controls. These observations indicated that replication of the entire irradiated genome was probably not required for rec-dependent repair of X-irradiated cells, although it might be required for rec-dependent repair of UV-irradiated cells.
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Brozmanová J, Sedliaková M, Stefunková E, Slezáriková V. Effect of 5-fluorouracil posttreatment on sensitivity to ultraviolet radiation and course of messenger RNA synthesis in Escherichia coli cells. Folia Microbiol (Praha) 1971; 16:114-25. [PMID: 4928739 DOI: 10.1007/bf02887481] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Littbrand B. Survival characteristics of mammalian cell lines after single or multiple exposures to roentgen radiation under oxic or anoxic conditions. Acta Radiol Ther Phys Biol 1970; 9:257-81. [PMID: 5465650 DOI: 10.3109/02841867009129104] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Watkins DK. High oxygen effect for the release of enzymes from isolated mammalian lysosomes after treatment with ionizing radiation. Adv Biol Med Phys 1970; 13:289-305. [PMID: 4995587 DOI: 10.1016/b978-0-12-005213-4.50014-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Cook AM, Berry RJ. Microbial contamination on disposable hypodermic syringes prior to sterilization by ionizing radiation. Appl Microbiol 1968; 16:1156-62. [PMID: 5675506 PMCID: PMC547612 DOI: 10.1128/am.16.8.1156-1162.1968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A large number of syringes were taken from the production lines of three independent manufacturers; the numbers and types of microorganisms contaminating these randomly sampled syringes were assessed in the laboratories maintained by each of these manufacturers for routine sterility testing, according to a standard protocol devised by the Research Committee of the UK Panel on Gamma and Electron Irradiation, which coordinated the investigation and analyzed the results. Items produced by a manufacturer were assessed for microbiological contamination both in their own laboratories and in the laboratories of the other manufacturers. The level of "false-positive" results was determined independently for each laboratory by the testing of "known sterile" items which had been subjected to the radiation-sterilization process. Both the percentage of syringes initially sterile and the average number of organisms per contaminated syringe differed among the three manufacturers. When corrected for interlaboratory differences, the number of syringes initially sterile ranged from 16 to 48%, and the mean number of organisms per contaminated syringe was 20 to 70. Of 964 syringes tested by all three laboratories, only one contained over 1,000 aerobic organisms (1,133). The most common organisms found were coagulase-negative, gram-positive cocci. Two manufacturers assessed contamination by anaerobic organisms; of 610 syringes, 1 contained 4,275 organisms and 3 more had 100 to 1,000 organisms, but 488 (80%) were uncontaminated by anaerobes. The results are discussed in the context of the choice of radiation dose necessary for the sterilization of medical products manufactured under controlled hygienic conditions.
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Alper T. Low oxygen enhancement ratios for radiosensitive bacterial strains, and the probable interaction of two types of primary lesion. Nature 1968; 217:862-3. [PMID: 4867977 DOI: 10.1038/217862a0] [Citation(s) in RCA: 49] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Cullen B. Transient Changes in the Radiosensitivity of Mammalian Cells on Transfer from in vivo to in vitro Culture Conditions. Nature 1967; 213:1268-70. [DOI: 10.1038/2131268a0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Munson RJ, Bridges BA. Site of lethal damage by ionizing radiation in Escherichia coli B-r growing exponentially in minimal medium. Nature 1966; 210:922-5. [PMID: 5335504 DOI: 10.1038/210922a0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Ainsworth EJ, Phillips TL, Kendall K. Influence of amioethylisothiouronium bromide-hydrobromide and hyposia on recovery from radiation injury in mice. Nature 1966; 210:323-4. [PMID: 5954580 DOI: 10.1038/210323a0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Davies D, Evans H. The Role of Genetic Damage in Radiation-Induced Cell Lethality. Elsevier; 1966. pp. 243-353. [DOI: 10.1016/b978-1-4832-3121-1.50011-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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POWERS E. SOME RECENT ADVANCES IN THE RADIATION BIOLOGY OF BACTERIA*. Radiol Clin North Am 1965. [DOI: 10.1016/s0033-8389(22)00782-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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