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Dahl H, Ballangby J, Tengs T, Wojewodzic MW, Eide DM, Brede DA, Graupner A, Duale N, Olsen AK. Dose rate dependent reduction in chromatin accessibility at transcriptional start sites long time after exposure to gamma radiation. Epigenetics 2023; 18:2193936. [PMID: 36972203 PMCID: PMC10054331 DOI: 10.1080/15592294.2023.2193936] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023] Open
Abstract
Ionizing radiation (IR) impact cellular and molecular processes that require chromatin remodelling relevant for cellular integrity. However, the cellular implications of ionizing radiation (IR) delivered per time unit (dose rate) are still debated. This study investigates whether the dose rate is relevant for inflicting changes to the epigenome, represented by chromatin accessibility, or whether it is the total dose that is decisive. CBA/CaOlaHsd mice were whole-body exposed to either chronic low dose rate (2.5 mGy/h for 54 d) or the higher dose rates (10 mGy/h for 14 d and 100 mGy/h for 30 h) of gamma radiation (60Co, total dose: 3 Gy). Chromatin accessibility was analysed in liver tissue samples using Assay for Transposase-Accessible Chromatin with high-throughput sequencing (ATAC-Seq), both one day after and over three months post-radiation (>100 d). The results show that the dose rate contributes to radiation-induced epigenomic changes in the liver at both sampling timepoints. Interestingly, chronic low dose rate exposure to a high total dose (3 Gy) did not inflict long-term changes to the epigenome. In contrast to the acute high dose rate given to the same total dose, reduced accessibility at transcriptional start sites (TSS) was identified in genes relevant for the DNA damage response and transcriptional activity. Our findings link dose rate to essential biological mechanisms that could be relevant for understanding long-term changes after ionizing radiation exposure. However, future studies are needed to comprehend the biological consequence of these findings.
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Affiliation(s)
- Hildegunn Dahl
- Division of Climate and Environmental Health, Department of Chemical Toxicology, Norwegian Institute of Public Health, Oslo, Norway
- Centre for Environmental Radiation (CERAD), Norwegian University of Life Sciences (NMBU), Ås, Norway
| | - Jarle Ballangby
- Division of Climate and Environmental Health, Department of Chemical Toxicology, Norwegian Institute of Public Health, Oslo, Norway
- Centre for Environmental Radiation (CERAD), Norwegian University of Life Sciences (NMBU), Ås, Norway
| | - Torstein Tengs
- Division of Climate and Environmental Health, Department of Chemical Toxicology, Norwegian Institute of Public Health, Oslo, Norway
- Centre for Environmental Radiation (CERAD), Norwegian University of Life Sciences (NMBU), Ås, Norway
- Division for Aquaculture, Department of breeding and genetics, Nofima, Ås, Norway
| | - Marcin W Wojewodzic
- Division of Climate and Environmental Health, Department of Chemical Toxicology, Norwegian Institute of Public Health, Oslo, Norway
- Centre for Environmental Radiation (CERAD), Norwegian University of Life Sciences (NMBU), Ås, Norway
- Department of Research, Section Molecular Epidemiology and Infections, Cancer Registry of Norway, Oslo, Norway
| | - Dag M Eide
- Division of Climate and Environmental Health, Department of Chemical Toxicology, Norwegian Institute of Public Health, Oslo, Norway
- Centre for Environmental Radiation (CERAD), Norwegian University of Life Sciences (NMBU), Ås, Norway
| | - Dag Anders Brede
- Centre for Environmental Radiation (CERAD), Norwegian University of Life Sciences (NMBU), Ås, Norway
- Faculty of Environmental Sciences and Natural Resource Management (MINA), Norwegian University of Life Sciences (NMBU), Ås, Norway
| | - Anne Graupner
- Division of Climate and Environmental Health, Department of Chemical Toxicology, Norwegian Institute of Public Health, Oslo, Norway
- Centre for Environmental Radiation (CERAD), Norwegian University of Life Sciences (NMBU), Ås, Norway
| | - Nur Duale
- Division of Climate and Environmental Health, Department of Chemical Toxicology, Norwegian Institute of Public Health, Oslo, Norway
- Centre for Environmental Radiation (CERAD), Norwegian University of Life Sciences (NMBU), Ås, Norway
| | - Ann-Karin Olsen
- Division of Climate and Environmental Health, Department of Chemical Toxicology, Norwegian Institute of Public Health, Oslo, Norway
- Centre for Environmental Radiation (CERAD), Norwegian University of Life Sciences (NMBU), Ås, Norway
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Macedo-Silva C, Benedetti R, Ciardiello F, Cappabianca S, Jerónimo C, Altucci L. Epigenetic mechanisms underlying prostate cancer radioresistance. Clin Epigenetics 2021; 13:125. [PMID: 34103085 PMCID: PMC8186094 DOI: 10.1186/s13148-021-01111-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Accepted: 06/02/2021] [Indexed: 12/24/2022] Open
Abstract
Radiotherapy (RT) is one of the mainstay treatments for prostate cancer (PCa), a highly prevalent neoplasm among males worldwide. About 30% of newly diagnosed PCa patients receive RT with a curative intent. However, biochemical relapse occurs in 20–40% of advanced PCa treated with RT either alone or in combination with adjuvant-hormonal therapy. Epigenetic alterations, frequently associated with molecular variations in PCa, contribute to the acquisition of a radioresistant phenotype. Increased DNA damage repair and cell cycle deregulation decreases radio-response in PCa patients. Moreover, the interplay between epigenome and cell growth pathways is extensively described in published literature. Importantly, as the clinical pattern of PCa ranges from an indolent tumor to an aggressive disease, discovering specific targetable epigenetic molecules able to overcome and predict PCa radioresistance is urgently needed. Currently, histone-deacetylase and DNA-methyltransferase inhibitors are the most studied classes of chromatin-modifying drugs (so-called ‘epidrugs’) within cancer radiosensitization context. Nonetheless, the lack of reliable validation trials is a foremost drawback. This review summarizes the major epigenetically induced changes in radioresistant-like PCa cells and describes recently reported targeted epigenetic therapies in pre-clinical and clinical settings. ![]()
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Affiliation(s)
- Catarina Macedo-Silva
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naplei, Italy.,Cancer Biology and Epigenetics Group, Research Center at Portuguese Oncology Institute of Porto, F Bdg, 1st Floor, Rua Dr. António Bernardino de Almeida, 4200-072, Porto, Portugal
| | - Rosaria Benedetti
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naplei, Italy
| | - Fortunato Ciardiello
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naplei, Italy
| | - Salvatore Cappabianca
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naplei, Italy
| | - Carmen Jerónimo
- Cancer Biology and Epigenetics Group, Research Center at Portuguese Oncology Institute of Porto, F Bdg, 1st Floor, Rua Dr. António Bernardino de Almeida, 4200-072, Porto, Portugal. .,Department of Pathology and Molecular Immunology at School of Medicine and Biomedical Sciences, University of Porto (ICBAS-UP), Porto, Portugal.
| | - Lucia Altucci
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naplei, Italy.
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Iizuka D, Izumi S, Suzuki F, Kamiya K. Analysis of a lectin microarray identifies altered sialylation of mouse serum glycoproteins induced by whole-body radiation exposure. JOURNAL OF RADIATION RESEARCH 2019; 60:189-196. [PMID: 30521038 PMCID: PMC6430252 DOI: 10.1093/jrr/rry100] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 09/19/2018] [Indexed: 05/08/2023]
Abstract
Microarrays containing 45 different lectins were analyzed to identify global changes in the glycosylation of serum glycoproteins from mice exposed to whole-body γ-radiation. The results showed that radiation exposure increased and decreased the relative amounts of α-2,3- and α-2,6-sialic acids, respectively. The expression of α-2,3- and α-2,6-sialyltransferase genes in the liver was analyzed to determine whether changes in their expression were responsible for the sialic acid changes. The increase in α-2,3-sialic acid correlated with St3gal5 upregulation after radiation exposure; however, a decrease in St6gal1 expression was not observed. Analysis of a PCR array of genes expressed in irradiated mouse livers revealed that irradiation did not alter the expression of most of the included genes. These results suggest that glycomic screening of serum glycoproteins using lectin microarrays can be a powerful tool for identifying radiation-induced changes in the post-translational addition of sugar moieties to proteins. In addition, the results indicate that altered sialylation of glycoproteins may be an initial response to acute radiation exposure.
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Affiliation(s)
- Daisuke Iizuka
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, Japan
- Department of Experimental Oncology, Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3, Kasumi, Minami-ku, Hiroshima, Japan
- Corresponding author. Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan. Tel: +81-43-206-3160; Fax: +81-43-206-4138;
| | - Shunsuke Izumi
- Department of Mathematical and Life Sciences, Graduate School of Science, Hiroshima University, 1-3-2, Kagamiyama, Higashi-Hiroshima, Japan
| | - Fumio Suzuki
- Department of Molecular Radiobiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3, Kasumi, Minami-ku, Hiroshima, Japan
| | - Kenji Kamiya
- Department of Experimental Oncology, Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3, Kasumi, Minami-ku, Hiroshima, Japan
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Karabulutoglu M, Finnon R, Imaoka T, Friedl AA, Badie C. Influence of diet and metabolism on hematopoietic stem cells and leukemia development following ionizing radiation exposure. Int J Radiat Biol 2018; 95:452-479. [PMID: 29932783 DOI: 10.1080/09553002.2018.1490042] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
PURPOSE The review aims to discuss the prominence of dietary and metabolic regulators in maintaining hematopoietic stem cell (HSC) function, long-term self-renewal, and differentiation. RESULTS Most adult stem cells are preserved in a quiescent, nonmotile state in vivo which acts as a "protective state" for stem cells to reduce endogenous stress provoked by DNA replication and cellular respiration as well as exogenous environmental stress. The dynamic balance between quiescence, self-renewal and differentiation is critical for supporting a functional blood system throughout life of an organism. Stress-conditions, for example ionizing radiation exposure can trigger the blood forming HSCs to proliferate and migrate through extramedullary tissues to expand the number of HSCs and increase hematopoiesis. In addition, a wealth of investigation validated that deregulation of this balance plays a critical pathogenic role in various different hematopoietic diseases including the leukemia development. CONCLUSION The review summarizes the current knowledge on how alterations in dietary and metabolic factors could alter the risk of leukemia development following ionizing radiation exposure by inhibiting or even reversing the leukemic progression. Understanding the influence of diet, metabolism, and epigenetics on radiation-induced leukemogenesis may lead to the development of practical interventions to reduce the risk in exposed populations.
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Affiliation(s)
- Melis Karabulutoglu
- a Cancer Mechanisms and Biomarkers group, Biological Effects Department, Centre for Radiation, Chemical and Environmental Hazards , Public Health England , Didcot , UK.,b CRUK & MRC Oxford Institute for Radiation Oncology, Department of Oncology , University of Oxford , Oxford , UK
| | - Rosemary Finnon
- a Cancer Mechanisms and Biomarkers group, Biological Effects Department, Centre for Radiation, Chemical and Environmental Hazards , Public Health England , Didcot , UK
| | - Tatsuhiko Imaoka
- c Department of Radiation Effects Research, National Institute of Radiological Sciences , National Institutes for Quantum and Radiological Science and Technology , Chiba , Japan
| | - Anna A Friedl
- d Department of Radiation Oncology , University Hospital, LMU Munich , Munich , Germany
| | - Christophe Badie
- a Cancer Mechanisms and Biomarkers group, Biological Effects Department, Centre for Radiation, Chemical and Environmental Hazards , Public Health England , Didcot , UK
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Ghosh S, Sinha JK, Raghunath M. Epigenomic maintenance through dietary intervention can facilitate DNA repair process to slow down the progress of premature aging. IUBMB Life 2016; 68:717-21. [PMID: 27364681 DOI: 10.1002/iub.1532] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 06/15/2016] [Indexed: 12/27/2022]
Abstract
DNA damage caused by various sources remains one of the most researched topics in the area of aging and neurodegeneration. Increased DNA damage causes premature aging. Aging is plastic and is characterised by the decline in the ability of a cell/organism to maintain genomic stability. Lifespan can be modulated by various interventions like calorie restriction, a balanced diet of macro and micronutrients or supplementation with nutrients/nutrient formulations such as Amalaki rasayana, docosahexaenoic acid, resveratrol, curcumin, etc. Increased levels of DNA damage in the form of double stranded and single stranded breaks are associated with decreased longevity in animal models like WNIN/Ob obese rats. Erroneous DNA repair can result in accumulation of DNA damage products, which in turn result in premature aging disorders such as Hutchinson-Gilford progeria syndrome. Epigenomic studies of the aging process have opened a completely new arena for research and development of drugs and therapeutic agents. We propose here that agents or interventions that can maintain epigenomic stability and facilitate the DNA repair process can slow down the progress of premature aging, if not completely prevent it. © 2016 IUBMB Life, 68(9):717-721, 2016.
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Affiliation(s)
- Shampa Ghosh
- Endocrinology and Metabolism Division, National Institute of Nutrition (NIN), Indian Council of Medical Research (ICMR), Hyderabad, 500007, India
| | - Jitendra Kumar Sinha
- Endocrinology and Metabolism Division, National Institute of Nutrition (NIN), Indian Council of Medical Research (ICMR), Hyderabad, 500007, India.,Epigenetics and Neuropsychiatric Disease Laboratory, CSIR - Centre for Cellular and Molecular Biology (CCMB), Hyderabad, 500007, India
| | - Manchala Raghunath
- Endocrinology and Metabolism Division, National Institute of Nutrition (NIN), Indian Council of Medical Research (ICMR), Hyderabad, 500007, India
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Abstract
The aim of this work is to review the uses of laser microirradiation and ion microbeam techniques within the scope of radiobiological research. Laser microirradiation techniques can be used for many different purposes. In a specific condition, through the use of pulsed lasers, cell lysis can be produced for subsequent separation of different analytes. Microsurgery allows for the identification and isolation of tissue sections, single cells and subcellular components, using different types of lasers. The generation of different types of DNA damage, via this type of microirradiation, allows for the investigation of DNA dynamics. Ion microbeams are important tools in radiobiological research. There are only a limited number of facilities worldwide where radiobiological experiments can be performed. In the beginning, research was mostly focused on the bystander effect. Nowadays, with more sophisticated molecular and cellular biological techniques, ion microirradiation is used to unravel molecular processes in the field of radiobiology. These include DNA repair protein kinetics or chromatin modifications at the site of DNA damage. With the increasing relevance of charged particles in tumour therapy and new concepts on how to generate them, ion microbeam facilities are able to address unresolved questions concerning particle tumour therapy.
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Affiliation(s)
- Guido A Drexler
- 1Department of Radiation Oncology, University of Munich, Schillerstr. 42, 80336, Munich, Germany,
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Thompson GL, Roth CC, Kuipers MA, Tolstykh GP, Beier HT, Ibey BL. Permeabilization of the nuclear envelope following nanosecond pulsed electric field exposure. Biochem Biophys Res Commun 2015; 470:35-40. [PMID: 26721436 DOI: 10.1016/j.bbrc.2015.12.092] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 12/20/2015] [Indexed: 01/14/2023]
Abstract
Permeabilization of cell membranes occurs upon exposure to a threshold absorbed dose (AD) of nanosecond pulsed electric fields (nsPEF). The ultimate, physiological bioeffect of this exposure depends on the type of cultured cell and environment, indicating that cell-specific pathways and structures are stimulated. Here we investigate 10 and 600 ns duration PEF effects on Chinese hamster ovary (CHO) cell nuclei, where our hypothesis is that pulse disruption of the nuclear envelope membrane leads to observed cell death and decreased viability 24 h post-exposure. To observe short-term responses to nsPEF exposure, CHO cells have been stably transfected with two fluorescently-labeled proteins known to be sequestered for cellular chromosomal function within the nucleus - histone-2b (H2B) and proliferating cell nuclear antigen (PCNA). H2B remains associated with chromatin after nsPEF exposure, whereas PCNA leaks out of nuclei permeabilized by a threshold AD of 10 and 600 ns PEF. A downturn in 24 h viability, measured by MTT assay, is observed at the number of pulses required to induce permeabilization of the nucleus.
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Affiliation(s)
- Gary L Thompson
- Oak Ridge Institute for Science & Education, Joint Base San Antonio Fort Sam Houston, TX, 78234, USA.
| | - Caleb C Roth
- Department of Radiological Sciences, University of Texas Health Science Center at San Antonio, TX, 78234, USA
| | - Marjorie A Kuipers
- Radio Frequency Radiation Branch, Bioeffects Division, Human Effectiveness Directorate, 711th Human Performance Wing, Air Force Research Laboratory, Joint Base San Antonio Fort Sam Houston, TX, 78234, USA
| | - Gleb P Tolstykh
- General Dynamics IT, Joint Base San Antonio Fort Sam Houston, TX, 78234, USA
| | - Hope T Beier
- Optical Radiation Branch, Bioeffects Division, Human Effectiveness Directorate, 711th Human Performance Wing, Air Force Research Laboratory, Joint Base San Antonio Fort Sam Houston, TX, 78234, USA
| | - Bennett L Ibey
- Radio Frequency Radiation Branch, Bioeffects Division, Human Effectiveness Directorate, 711th Human Performance Wing, Air Force Research Laboratory, Joint Base San Antonio Fort Sam Houston, TX, 78234, USA
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Chandel N, Ayasolla KS, Lan X, Sultana-Syed M, Chawla A, Lederman R, Vethantham V, Saleem MA, Chander PN, Malhotra A, Singhal PC. Epigenetic Modulation of Human Podocyte Vitamin D Receptor in HIV Milieu. J Mol Biol 2015; 427:3201-3215. [PMID: 26210663 PMCID: PMC4586951 DOI: 10.1016/j.jmb.2015.07.011] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Revised: 07/09/2015] [Accepted: 07/14/2015] [Indexed: 01/08/2023]
Abstract
HIV (human immunodeficiency virus) has been reported to induce podocyte injury through down regulation of vitamin D receptor (VDR) and activation of renin angiotensin system; however, the involved mechanism is not clear. Since HIV has been reported to modulate gene expression via epigenetic phenomena, we asked whether epigenetic factors contribute to down regulation of VDR. Kidney cells in HIV transgenic mice and HIV-infected podocytes (HIV/HPs) displayed enhanced expression of SNAIL, a repressor of VDR. To elucidate the mechanism, we studied the effect of HIV on expression of molecules involved in SNAIL repressor complex formation and demonstrated that HIV enhances expression of the histone deacetylase HDAC1 and DNA methyl transferases DNMT3b and DNMT1. 293T cells, when stably transfected with SNAIL (SNAIL/293T), displayed suppressed transcription and translation of VDR. In SNAIL/293T cells, co-immunoprecipitation studies revealed the association of HDAC1, DNMT3b, DNMT1, and mSin3A with SNAIL. Chromatin immunoprecipitation experiments confirmed the presence of the SNAIL repressor complex at the VDR promoter. Consistent with the enhanced DNA methyl transferase expression in HIV/HPs, there was an increased CpG methylation at the VDR promoter. Chromatin immunoprecipitation assay confirmed occurrence of H3K4 trimethylation on SNAIL promoter. Neither a VDR agonist (VDA) nor an HDAC inhibitor (HDACI) nor a demethylating agent (DAC) individually could optimally up regulate VDR in HIV milieu. However, VDA and HDACI when combined were successful in de-repressing VDR expression. Our findings demonstrate that SNAIL recruits multiple chromatin enzymes to form a repressor complex in HIV milieu that down regulates VDR expression.
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Affiliation(s)
- Nirupama Chandel
- Center of Immunology and Inflammation, Feinstein Institute for Medical Research, Manhasset, NY 11030, USA; Hofstra North Shore LIJ Medical School, Hempstead, NY 11549-1000, USA
| | - Kameshwar S Ayasolla
- Center of Immunology and Inflammation, Feinstein Institute for Medical Research, Manhasset, NY 11030, USA; Hofstra North Shore LIJ Medical School, Hempstead, NY 11549-1000, USA
| | - Xiqian Lan
- Center of Immunology and Inflammation, Feinstein Institute for Medical Research, Manhasset, NY 11030, USA; Hofstra North Shore LIJ Medical School, Hempstead, NY 11549-1000, USA
| | - Maria Sultana-Syed
- Center of Immunology and Inflammation, Feinstein Institute for Medical Research, Manhasset, NY 11030, USA; Hofstra North Shore LIJ Medical School, Hempstead, NY 11549-1000, USA
| | - Amrita Chawla
- Center of Immunology and Inflammation, Feinstein Institute for Medical Research, Manhasset, NY 11030, USA; Hofstra North Shore LIJ Medical School, Hempstead, NY 11549-1000, USA
| | - Rivka Lederman
- Center of Immunology and Inflammation, Feinstein Institute for Medical Research, Manhasset, NY 11030, USA; Hofstra North Shore LIJ Medical School, Hempstead, NY 11549-1000, USA
| | - Vasupradha Vethantham
- Center of Immunology and Inflammation, Feinstein Institute for Medical Research, Manhasset, NY 11030, USA; Hofstra North Shore LIJ Medical School, Hempstead, NY 11549-1000, USA
| | - Moin A Saleem
- Renal Academic Unit, University of Bristol, City of Bristol BS8 1TH, United Kingdom
| | - Praveen N Chander
- Department of Pathology, New York Medical College, Valhalla, NY 10595, USA
| | - Ashwani Malhotra
- Center of Immunology and Inflammation, Feinstein Institute for Medical Research, Manhasset, NY 11030, USA; Hofstra North Shore LIJ Medical School, Hempstead, NY 11549-1000, USA
| | - Pravin C Singhal
- Center of Immunology and Inflammation, Feinstein Institute for Medical Research, Manhasset, NY 11030, USA; Hofstra North Shore LIJ Medical School, Hempstead, NY 11549-1000, USA.
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Maroschik B, Gürtler A, Krämer A, Rößler U, Gomolka M, Hornhardt S, Mörtl S, Friedl AA. Radiation-induced alterations of histone post-translational modification levels in lymphoblastoid cell lines. Radiat Oncol 2014; 9:15. [PMID: 24406105 PMCID: PMC3903440 DOI: 10.1186/1748-717x-9-15] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2013] [Accepted: 12/23/2013] [Indexed: 12/22/2022] Open
Abstract
Background Radiation-induced alterations in posttranslational histone modifications (PTMs) may affect the cellular response to radiation damage in the DNA. If not reverted appropriately, altered PTM patterns may cause long-term alterations in gene expression regulation and thus lead to cancer. It is therefore important to characterize radiation-induced alterations in PTM patterns and the factors affecting them. Methods A lymphoblastoid cell line established from a normal donor was used to screen for alterations in methylation levels at H3K4, H3K9, H3K27, and H4K20, as well as acetylation at H3K9, H3K56, H4K5, and H4K16, by quantitative Western Blot analysis at 15 min, 1 h and 24 h after irradiation with 2 Gy and 10 Gy. The variability of alterations in acetylation marks was in addition investigated in a panel of lymphoblastoid cell lines with differing radiosensitivity established from lung cancer patients. Results The screening procedure demonstrated consistent hypomethylation at H3K4me3 and hypoacetylation at all acetylation marks tested. In the panel of lymphoblastoid cell lines, however, a high degree of inter-individual variability became apparent. Radiosensitive cell lines showed more pronounced and longer lasting H4K16 hypoacetylation than radioresistant lines, which correlates with higher levels of residual γ-H2AX foci after 24 h. Conclusion So far, the factors affecting extent and duration of radiation-induced histone alterations are poorly defined. The present work hints at a high degree of inter-individual variability and a potential correlation of DNA damage repair capacity and alterations in PTM levels.
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Affiliation(s)
| | | | | | | | | | | | | | - Anna A Friedl
- Department of Radiation Oncology, Ludwig-Maximilians-University, Munich, Germany.
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Chen X, Wang Y, Li Q, Tsai S, Thomas A, Shizuru JA, Cao TM. Pathways analysis of differential gene expression induced by engrafting doses of total body irradiation for allogeneic bone marrow transplantation in mice. Immunogenetics 2013; 65:597-607. [PMID: 23703256 DOI: 10.1007/s00251-013-0710-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2013] [Accepted: 05/04/2013] [Indexed: 01/13/2023]
Abstract
A major challenge in allogeneic bone marrow (BM) transplantation is overcoming engraftment resistance to avoid the clinical problem of graft rejection. Identifying gene pathways that regulate BM engraftment may reveal molecular targets for overcoming engraftment barriers. Previously, we developed a mouse model of BM transplantation that utilizes recipient conditioning with non-myeloablative total body irradiation (TBI). We defined TBI doses that lead to graft rejection, that conversely are permissive for engraftment, and mouse strain variation with regards to the permissive TBI dose. We now report gene expression analysis, using Agilent Mouse 8x60K microarrays, in spleens of mice conditioned with varied TBI doses for correlation to the expected engraftment phenotype. The spleens of mice given engrafting doses of TBI, compared with non-engrafting TBI doses, demonstrated substantially broader gene expression changes, significant at the multiple testing-corrected P <0.05 level and with fold change ≥2. Functional analysis revealed significant enrichment for a down-regulated canonical pathway involving B-cell development. Genes enriched in this pathway suggest that suppressing donor antigen processing and presentation may be pivotal effects conferred by TBI to enable engraftment. Regardless of TBI dose and recipient mouse strain, pervasive genomic changes related to inflammation was observed and reflected by significant enrichment for canonical pathways and association with upstream regulators. These gene expression changes suggest that macrophage and complement pathways may be targeted to overcome engraftment barriers. These exploratory results highlight gene pathways that may be important in mediating BM engraftment resistance.
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Affiliation(s)
- Xinjian Chen
- Department of Pathology, University of Utah, Salt Lake City, UT 84132, USA
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