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Matsuya Y, McMahon SJ, Tsutsumi K, Sasaki K, Okuyama G, Yoshii Y, Mori R, Oikawa J, Prise KM, Date H. Investigation of dose-rate effects and cell-cycle distribution under protracted exposure to ionizing radiation for various dose-rates. Sci Rep 2018; 8:8287. [PMID: 29844494 PMCID: PMC5974424 DOI: 10.1038/s41598-018-26556-5] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 05/04/2018] [Indexed: 01/04/2023] Open
Abstract
During exposure to ionizing radiation, sub-lethal damage repair (SLDR) competes with DNA damage induction in cultured cells. By virtue of SLDR, cell survival increases with decrease of dose-rate, so-called dose-rate effects (DREs). Here, we focused on a wide dose-rate range and investigated the change of cell-cycle distribution during X-ray protracted exposure and dose-response curves via hybrid analysis with a combination of in vitro experiments and mathematical modelling. In the course of flow-cytometric cell-cycle analysis and clonogenic assays, we found the following responses in CHO-K1 cells: (1) The fraction of cells in S phase gradually increases during 6 h exposure at 3.0 Gy/h, which leads to radio-resistance. (2) Slight cell accumulation in S and G2/M phases is observed after exposure at 6.0 Gy/h for more than 10 hours. This suggests that an increase of SLDR rate for cells in S phase during irradiation may be a reproducible factor to describe changes in the dose-response curve at dose-rates of 3.0 and 6.0 Gy/h. By re-evaluating cell survival for various dose-rates of 0.186-60.0 Gy/h considering experimental-based DNA content and SLDR, it is suggested that the change of S phase fraction during irradiation modulates the dose-response curve and is possibly responsible for some inverse DREs.
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Affiliation(s)
- Yusuke Matsuya
- Graduate School of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Stephen J McMahon
- Centre for Cancer Research & Cell Biology, Queen's University Belfast, Belfast, BT9 7AE, UK
| | - Kaori Tsutsumi
- Faculty of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Kohei Sasaki
- Faculty of Health Sciences, Hokkaido University of Science, Sapporo, 006-8585, Japan
| | - Go Okuyama
- Faculty of Health Sciences, Hokkaido University of Science, Sapporo, 006-8585, Japan
| | - Yuji Yoshii
- Biological Research, Education and Instrumentation Center, Sapporo Medical University, Sapporo, 060-8556, Japan
| | - Ryosuke Mori
- Graduate School of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Joma Oikawa
- Graduate School of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Kevin M Prise
- Centre for Cancer Research & Cell Biology, Queen's University Belfast, Belfast, BT9 7AE, UK
| | - Hiroyuki Date
- Faculty of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan.
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Matsuya Y, McMahon SJ, Tsutsumi K, Sasaki K, Okuyama G, Yoshii Y, Mori R, Oikawa J, Prise KM, Date H. Investigation of dose-rate effects and cell-cycle distribution under protracted exposure to ionizing radiation for various dose-rates. Sci Rep 2018. [PMID: 29844494 DOI: 10.1038/s41598a018-26556a5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023] Open
Abstract
During exposure to ionizing radiation, sub-lethal damage repair (SLDR) competes with DNA damage induction in cultured cells. By virtue of SLDR, cell survival increases with decrease of dose-rate, so-called dose-rate effects (DREs). Here, we focused on a wide dose-rate range and investigated the change of cell-cycle distribution during X-ray protracted exposure and dose-response curves via hybrid analysis with a combination of in vitro experiments and mathematical modelling. In the course of flow-cytometric cell-cycle analysis and clonogenic assays, we found the following responses in CHO-K1 cells: (1) The fraction of cells in S phase gradually increases during 6 h exposure at 3.0 Gy/h, which leads to radio-resistance. (2) Slight cell accumulation in S and G2/M phases is observed after exposure at 6.0 Gy/h for more than 10 hours. This suggests that an increase of SLDR rate for cells in S phase during irradiation may be a reproducible factor to describe changes in the dose-response curve at dose-rates of 3.0 and 6.0 Gy/h. By re-evaluating cell survival for various dose-rates of 0.186-60.0 Gy/h considering experimental-based DNA content and SLDR, it is suggested that the change of S phase fraction during irradiation modulates the dose-response curve and is possibly responsible for some inverse DREs.
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Affiliation(s)
- Yusuke Matsuya
- Graduate School of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Stephen J McMahon
- Centre for Cancer Research & Cell Biology, Queen's University Belfast, Belfast, BT9 7AE, UK
| | - Kaori Tsutsumi
- Faculty of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Kohei Sasaki
- Faculty of Health Sciences, Hokkaido University of Science, Sapporo, 006-8585, Japan
| | - Go Okuyama
- Faculty of Health Sciences, Hokkaido University of Science, Sapporo, 006-8585, Japan
| | - Yuji Yoshii
- Biological Research, Education and Instrumentation Center, Sapporo Medical University, Sapporo, 060-8556, Japan
| | - Ryosuke Mori
- Graduate School of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Joma Oikawa
- Graduate School of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Kevin M Prise
- Centre for Cancer Research & Cell Biology, Queen's University Belfast, Belfast, BT9 7AE, UK
| | - Hiroyuki Date
- Faculty of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan.
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Matsuya Y, Sasaki K, Yoshii Y, Okuyama G, Date H. Integrated Modelling of Cell Responses after Irradiation for DNA-Targeted Effects and Non-Targeted Effects. Sci Rep 2018; 8:4849. [PMID: 29555939 PMCID: PMC5859303 DOI: 10.1038/s41598-018-23202-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 03/07/2018] [Indexed: 01/10/2023] Open
Abstract
Intercellular communication after ionizing radiation exposure, so-called non-targeted effects (NTEs), reduces cell survival. Here we describe an integrated cell-killing model considering NTEs and DNA damage along radiation particle tracks, known as DNA-targeted effects (TEs) based on repair kinetics of DNA damage. The proposed model was applied to a series of experimental data, i.e., signal concentration, DNA damage kinetics, cell survival curve and medium transfer bystander effects (MTBEs). To reproduce the experimental data, the model considers the following assumptions: (i) the linear-quadratic (LQ) function as absorbed dose to express the hit probability to emit cell-killing signals, (ii) the potentially repair of DNA lesions induced by NTEs, and (iii) lower efficiency of repair for the damage in NTEs than that in TEs. By comparing the model results with experimental data, we found that signal-induced DNA damage and lower repair efficiency in non-hit cells are responsible for NTE-related repair kinetics of DNA damage, cell survival curve with low-dose hyper-radiosensitivity (HRS) and MTBEs. From the standpoint of modelling, the integrated cell-killing model with the LQ relation and a different repair function for NTEs provide a reasonable signal-emission probability and a new estimation of low-dose HRS linked to DNA repair efficiency.
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Affiliation(s)
- Yusuke Matsuya
- Graduate School of Health Sciences, Hokkaido University, Kita-12, Nishi-5, Kita-ku, Sapporo, 060-0812, Japan
| | - Kohei Sasaki
- Faculty of Health Sciences, Hokkaido University of Science, Maeda 7-15, Teine-ku, Sapporo, 006-8585, Japan
| | - Yuji Yoshii
- Biological Research, Education and Instrumentation Center, Sapporo Medical University, Minami-1, Nichi-17, Chuo-ku, Sapporo, 060-8556, Japan
| | - Go Okuyama
- Faculty of Health Sciences, Hokkaido University of Science, Maeda 7-15, Teine-ku, Sapporo, 006-8585, Japan
| | - Hiroyuki Date
- Faculty of Health Sciences, Hokkaido University, Kita-12, Nishi-5, Kita-ku, Sapporo, 060-0812, Japan.
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Takemoto S, Katagi H, Takahashi E, Naito K, Inui M, Okuyama G. The Production of Pelargonium graveolens Oil by Shoot and Plant Tissue Culture. Journal of Essential Oil Research 2011. [DOI: 10.1080/10412905.1989.9697764] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- S. Takemoto
- a Kanebo Ltd., Biochemistry Laboratory and Cosmetic Laboratory , 5-3-28 Kotobuki-cho, Odawara City, Kanagawa, 250, Japan
| | - H. Katagi
- a Kanebo Ltd., Biochemistry Laboratory and Cosmetic Laboratory , 5-3-28 Kotobuki-cho, Odawara City, Kanagawa, 250, Japan
| | - E. Takahashi
- a Kanebo Ltd., Biochemistry Laboratory and Cosmetic Laboratory , 5-3-28 Kotobuki-cho, Odawara City, Kanagawa, 250, Japan
| | - K. Naito
- a Kanebo Ltd., Biochemistry Laboratory and Cosmetic Laboratory , 5-3-28 Kotobuki-cho, Odawara City, Kanagawa, 250, Japan
| | - M. Inui
- a Kanebo Ltd., Biochemistry Laboratory and Cosmetic Laboratory , 5-3-28 Kotobuki-cho, Odawara City, Kanagawa, 250, Japan
| | - G. Okuyama
- a Kanebo Ltd., Biochemistry Laboratory and Cosmetic Laboratory , 5-3-28 Kotobuki-cho, Odawara City, Kanagawa, 250, Japan
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Saitoh T, Ishida Y, Matsumoto Y, Okuyama G, Niizeki K. Determination Of The Trends In The Hemoglobin Concentrations In Inactive Muscles During Cycling Exercise. Med Sci Sports Exerc 2011. [DOI: 10.1249/01.mss.0000401793.87493.26] [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: 11/21/2022]
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