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Liu C, Kawata T, Zhou G, Furusawa Y, Kota R, Kumabe A, Sutani S, Fukada J, Mishima M, Shigematsu N, George K, Cucinotta F. Comparison of the repair of potentially lethal damage after low- and high-LET radiation exposure, assessed from the kinetics and fidelity of chromosome rejoining in normal human fibroblasts. JOURNAL OF RADIATION RESEARCH 2013; 54:989-997. [PMID: 23674607 PMCID: PMC3823769 DOI: 10.1093/jrr/rrt031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2012] [Revised: 03/09/2013] [Accepted: 03/12/2013] [Indexed: 06/02/2023]
Abstract
Potentially lethal damage (PLD) and its repair (PLDR) were studied in confluent human fibroblasts by analyzing the kinetics of chromosome break rejoining after X-ray or heavy-ion exposures. Cells were either held in the non-cycling G0 phase of the cell cycle for 12 h, or forced to proliferate immediately after irradiation. Fusion premature chromosome condensation (PCC) was combined with fluorescence in situ hybridization (FISH) to study chromosomal aberrations in interphase. The culture condition had no impact on the rejoining kinetics of PCC breaks during the 12 h after X-ray or heavy-ion irradiation. However, 12 h after X-ray and silicon irradiation, cycling cells had more chromosome exchanges than non-cycling cells. After 6 Gy X-rays, the yield of exchanges in cycling cells was 2.8 times higher than that in non-cycling cells, and after 2 Gy of 55 keV/μm silicon ions the yield of exchanges in cycling cells was twice that of non-cycling cells. In contrast, after exposure to 2 Gy 200-keV/μm or 440-keV/μm iron ions the yield of exchanges was similar in non-cycling and cycling cells. Since the majority of repair in G0/G1 occurs via the non-homologous end joining process (NHEJ), increased PLDR in X-ray and silicon-ion irradiated cells may result from improved cell cycle-specific rejoining fidelity through the NHEJ pathway, which is not the case in high-LET iron-ion irradiated cells.
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Affiliation(s)
- Cuihua Liu
- Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Tetsuya Kawata
- Department of Radiology, School of Medicine, Keio University, Tokyo, 160-8582, Japan
| | - Guangming Zhou
- Department of Space Radiobiology, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730-000, China
| | - Yoshiya Furusawa
- Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Ryuichi Kota
- Department of Radiology, School of Medicine, Keio University, Tokyo, 160-8582, Japan
| | - Atsuhiro Kumabe
- Department of Radiology, School of Medicine, Keio University, Tokyo, 160-8582, Japan
| | - Shinya Sutani
- Department of Radiology, School of Medicine, Keio University, Tokyo, 160-8582, Japan
| | - Junichi Fukada
- Department of Radiology, School of Medicine, Keio University, Tokyo, 160-8582, Japan
| | - Masayo Mishima
- Department of Radiology, School of Medicine, Keio University, Tokyo, 160-8582, Japan
| | - Naoyuki Shigematsu
- Department of Radiology, School of Medicine, Keio University, Tokyo, 160-8582, Japan
| | - Kerry George
- Wyle Integrated Science and Engineering Group, Houston, Texas, USA
| | - Francis Cucinotta
- NASA Johnson Space Center, Radiation Biophysics, Houston, Texas, USA
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Liu C, Kawata T, Furusawa Y, Zhou G, Inoue K, Fukada J, Kota R, George K, Cucinotta F, Okayasu R. Chromosome aberrations in normal human fibroblasts analyzed in G0/G1 and G2/M phases after exposure in G0 to radiation with different linear energy transfer (LET). MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2013; 756:101-7. [DOI: 10.1016/j.mrgentox.2013.05.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Accepted: 05/09/2013] [Indexed: 11/29/2022]
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Liu C, Kawata T, Shigematsu N, Cucinotta F, George K, Saito M, Uno T, Isobe K, Ito H. A comparison of chromosome repair kinetics in G(0) and G(1) reveals that enhanced repair fidelity under noncycling conditions accounts for increased potentially lethal damage repair. Radiat Res 2010; 174:566-73. [PMID: 20954858 DOI: 10.1667/rr2159.1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Potentially lethal damage (PLD) and its repair were studied in confluent human fibroblasts by analyzing the kinetics of chromosome break rejoining and misrejoining in irradiated cells that were either held in noncycling G(0) phase or allowed to enter G(1) phase of the cell cycle immediately after 6 Gy irradiation. Virally mediated premature chromosome condensation (PCC) methods were combined with fluorescence in situ hybridization (FISH) to study chromosomal aberrations in interphase. Flow cytometry revealed that the vast majority of cells had not yet entered S phase 15 h after release from G(0). By this time some 95% of initially produced prematurely condensed chromosome breaks had rejoined, indicating that most repair processes occurred during G(1). The rejoining kinetics of prematurely condensed chromosome breaks was similar for each culture condition. However, under noncycling conditions misrepair peaked at 0.55 exchanges per cell, while under cycling conditions (G(1)) it peaked at 1.1 exchanges per cell. At 12 h postirradiation, complex-type exchanges were sevenfold more abundant for cycling cells (G(1)) than for noncycling cells (G(0)). Since most repair in G(0)/G(1) occurs via the non-homologous end-joining (NHEJ) process, increased PLD repair may result from improved cell cycle-specific rejoining fidelity of the NHEJ pathway.
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Affiliation(s)
- Cuihua Liu
- a Department of Radiology, Graduate School of Medicine, Chiba University, Chiba, Japan
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Influence of TEGDMA on the mammalian cell cycle in comparison with chemotherapeutic agents. Dent Mater 2010; 26:232-41. [DOI: 10.1016/j.dental.2009.10.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2009] [Revised: 10/09/2009] [Accepted: 10/16/2009] [Indexed: 01/08/2023]
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Morrison BH, Haney R, Lamarre E, Drazba J, Prestwich GD, Lindner DJ. Gene deletion of inositol hexakisphosphate kinase 2 predisposes to aerodigestive tract carcinoma. Oncogene 2009; 28:2383-92. [PMID: 19430495 DOI: 10.1038/onc.2009.113] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Inositol hexakisphosphate kinase 2 (IP6K2), a member of the inositol hexakisphosphate kinase family, functions as a growth suppressive and apoptosis-enhancing kinase during cell stress. We created mice with a targeted deletion of IP6K2; these mice display normal embryogenesis, development, growth and fertility. Chronic exposure to the carcinogen 4-nitroquinoline 1-oxide (4-NQO, a UV-mimetic compound) in drinking water resulted in fourfold increased incidence of invasive squamous cell carcinoma (SCC) formation in the oral cavity and esophagus of the knockout (KO) mice compared to the wild-type (WT) littermates. Paradoxically, KO mice displayed relative resistance to ionizing radiation and exhibit enhanced survival following 8-10 Gy total body irradiation. Primary KO fibroblasts displayed resistance to antiproliferative effects of interferon-beta and increased colony forming units following ionizing radiation. Radioresistance of KO fibroblasts was associated with accelerated DNA repair measured by comet assay. Direct microinjection of 5-PP-Ins(1,2,3,4,6)P(5) (the enzymatic product of IP6K2), but not InsP(6) (the substrate of IP6K2) induced cell death in SCC22A squamous carcinoma cells.
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Affiliation(s)
- B H Morrison
- Department of Translational Hematology and Oncology Research, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH 44195, USA
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