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Takeiri A, Matsuzaki K, Motoyama S, Yano M, Harada A, Katoh C, Tanaka K, Mishima M. High-content imaging analyses of γH2AX-foci and micronuclei in TK6 cells elucidated genotoxicity of chemicals and their clastogenic/aneugenic mode of action. Genes Environ 2019; 41:4. [PMID: 30766621 PMCID: PMC6362597 DOI: 10.1186/s41021-019-0117-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Accepted: 01/07/2019] [Indexed: 12/12/2022] Open
Abstract
Background The in vitro micronucleus (MN) test is an important component of a genotoxicity test battery that evaluates chemicals. Although the standard method of manually scoring micronucleated (MNed) cells by microscope is a reliable and standard method, it is laborious and time-consuming. A high-throughput assay system for detecting MN cells automatically has long been desired in the fields of pharmaceutical development or environmental risk monitoring. Although the MN test per se cannot clarify whether the mode of MN induction is aneugenic or clastogenic, this clarification may well be made possible by combining the MN test with an evaluation of γH2AX, a sensitive marker of DNA double strand breaks (DSB). In the present study, we aimed to establish a high-content (HC) imaging assay that automatically detects micronuclei (MNi) and simultaneously measures γH2AX foci in human lymphoblastoid TK6 cells. Results TK6 cells were fixed on the bottom of each well in 96-well plates hypotonically, which spreads the cells thinly to detach MNi from the primary nuclei. Then, the number of MNi and immunocytochemically-stained γH2AX foci were measured using an imaging analyzer. The system correctly judged 4 non-genotoxins and 13 genotoxins, which included 9 clastogens and 4 aneugens representing various genotoxic mechanisms, such as DNA alkylation, cross-linking, topoisomerase inhibition, and microtubule disruption. Furthermore, all the clastogens induced both γH2AX foci and MNi, while the aneugens induced only MNi, not γH2AX foci; therefore, the HC imaging assay clearly discriminated the aneugens from the clastogens. Additionally, the test system could feasibly analyze cell cycle, to add information about a chemical’s mode of action. Conclusions A HC imaging assay to detect γH2AX foci and MNi in TK6 cells was established, and the assay provided information on the aneugenic/clastogenic mode of action. Electronic supplementary material The online version of this article (10.1186/s41021-019-0117-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Akira Takeiri
- Fuji Gotemba Research Laboratories, Chugai Pharmaceutical Co., Ltd., 1-135 Komakado, Gotemba, Shizuoka, 412-8513 Japan
| | - Kaori Matsuzaki
- Fuji Gotemba Research Laboratories, Chugai Pharmaceutical Co., Ltd., 1-135 Komakado, Gotemba, Shizuoka, 412-8513 Japan
| | - Shigeki Motoyama
- Fuji Gotemba Research Laboratories, Chugai Pharmaceutical Co., Ltd., 1-135 Komakado, Gotemba, Shizuoka, 412-8513 Japan
| | - Mariko Yano
- Fuji Gotemba Research Laboratories, Chugai Pharmaceutical Co., Ltd., 1-135 Komakado, Gotemba, Shizuoka, 412-8513 Japan
| | - Asako Harada
- Fuji Gotemba Research Laboratories, Chugai Pharmaceutical Co., Ltd., 1-135 Komakado, Gotemba, Shizuoka, 412-8513 Japan
| | - Chiaki Katoh
- Fuji Gotemba Research Laboratories, Chugai Pharmaceutical Co., Ltd., 1-135 Komakado, Gotemba, Shizuoka, 412-8513 Japan
| | - Kenji Tanaka
- Fuji Gotemba Research Laboratories, Chugai Pharmaceutical Co., Ltd., 1-135 Komakado, Gotemba, Shizuoka, 412-8513 Japan
| | - Masayuki Mishima
- Fuji Gotemba Research Laboratories, Chugai Pharmaceutical Co., Ltd., 1-135 Komakado, Gotemba, Shizuoka, 412-8513 Japan
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Wakuri S, Yamakage K, Kazuki Y, Kazuki K, Oshimura M, Aburatani S, Yasunaga M, Nakajima Y. Correlation between luminescence intensity and cytotoxicity in cell-based cytotoxicity assay using luciferase. Anal Biochem 2017; 522:18-29. [PMID: 28111305 DOI: 10.1016/j.ab.2017.01.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 01/17/2017] [Accepted: 01/18/2017] [Indexed: 10/20/2022]
Abstract
The luciferase reporter assay has become one of the conventional methods for cytotoxicity evaluation. Typically, the decrease of luminescence expressed by a constitutive promoter is used as an index of cytotoxicity. However, to our knowledge, there have been no reports of the correlation between cytotoxicity and luminescence intensity. In this study, to accurately verify the correlation between them, beetle luciferase was stably expressed in human hepatoma HepG2 cells harboring the multi-integrase mouse artificial chromosome vector. We showed that the cytotoxicity assay using luciferase does not depend on the stability of luciferase protein and the kind of constitutive promoter. Next, HepG2 cells in which green-emitting beetle luciferase was expressed under the control of CAG promoter were exposed to 58 compounds. The luminescence intensity and cytotoxicity curves of cells exposed to 48 compounds showed similar tendencies, whereas those of cells exposed to 10 compounds did not do so, although the curves gradually approached each other with increasing exposure time. Finally, we demonstrated that luciferase expressed under the control of a constitutive promoter can be utilized both as an internal control reporter for normalizing a test reporter and for monitoring cytotoxicity when two kinds of luciferases are simultaneously used in the cytotoxicity assay.
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Affiliation(s)
- S Wakuri
- Hatano Research Institute, Food and Drug Safety Center, Hadano, Kanagawa 257-8523, Japan
| | - K Yamakage
- Hatano Research Institute, Food and Drug Safety Center, Hadano, Kanagawa 257-8523, Japan
| | - Y Kazuki
- Chromosome Engineering Research Center, Tottori University, Yonago, Tottori 683-8503, Japan; Department of Biomedical Science, Institute of Regenerative Medicine and Biofunction, Graduate School of Medical Science, Tottori University, Tottori 683-8503, Japan
| | - K Kazuki
- Chromosome Engineering Research Center, Tottori University, Yonago, Tottori 683-8503, Japan
| | - M Oshimura
- Chromosome Engineering Research Center, Tottori University, Yonago, Tottori 683-8503, Japan
| | - S Aburatani
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology (AIST), Aomi, Tokyo 135-0064, Japan
| | - M Yasunaga
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Takamatsu, Kagawa 761-0395, Japan
| | - Y Nakajima
- Chromosome Engineering Research Center, Tottori University, Yonago, Tottori 683-8503, Japan; Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Takamatsu, Kagawa 761-0395, Japan.
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Blagus T, Zager V, Cemazar M, Sersa G, Kamensek U, Zegura B, Nunic J, Filipic M. A cell-based biosensor system HepG2CDKN1A–DsRed for rapid and simple detection of genotoxic agents. Biosens Bioelectron 2014; 61:102-11. [DOI: 10.1016/j.bios.2014.05.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 04/29/2014] [Accepted: 05/02/2014] [Indexed: 01/22/2023]
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Hsieh WJ, Chiou ST, Pan MH, Hsieh SC. Establishment and evaluation of biotechnological platform for screening health food with antiinflammation ability. J Tradit Complement Med 2014; 2:76-80. [PMID: 24716118 PMCID: PMC3943015 DOI: 10.1016/s2225-4110(16)30074-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Chronic inflammation leads to a progressive inflammation in certain types of cells. Recent studies report that the activation of nuclear factor kappa B (NF-κB) increases the expression of inflammation-related protein such as inducible nitric oxide synthase (iNOS), and cyclooxygenase-2 (COX-2), which further enhance the chronic inflammation, thus conduct the development of disorders. The aim of the study is to develop an efficient method for screening food components with anti-inflammation function. Here we employed a reporter plasmid, which contains NF-κB response element followed by a minimal promoter for driving the down-stream luciferase reporter gene. After transfection of this plasmid to a mouse cell line RAW264.7, we obtained stable clones by using Hygromycin selection. Our results reveal that the luciferase activity of the cell based platform can be induced by the inflammation inducing reagent LPS and can be further suppressed by the administration of CAPE, an anti-inflammation chemical. The results estimated by our platform present good correlation to that analyzed by RT-Q-PCR. Additionally, the known anti-inflammation factors such as resveratrol, significantly counteracted the effect of LPS on our platform. Furthermore, the screening result of various mushroom extract showed that some fractions revealed NF-κB activating effects. Therefore, we conclude that the platform is effective in large scale screening for inflammatory regulating compounds.
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Affiliation(s)
- Wang-Ju Hsieh
- Department of Biochemical Science and Technology, National Taiwan University, Taipei, Taiwan
| | - Shih-Ting Chiou
- Institute of Food Science and Technology, National Taiwan University, Taipei, Taiwan
| | - Min-Hsiung Pan
- Department of Seafood Science, National Kaoshuiung Marine University, Kaoshiung, Taiwan
| | - Shu-Chen Hsieh
- Institute of Food Science and Technology, National Taiwan University, Taipei, Taiwan
- Correspondence to: Dr. Shu-Chen Hsieh. Graduate Institute of Food Science and Technology, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, Tel: +886-2-3366-9871, Fax: +886-2-2362-0849, E-mail:
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Tolosa L, Gómez-Lechón MJ, Pérez-Cataldo G, Castell JV, Donato MT. HepG2 cells simultaneously expressing five P450 enzymes for the screening of hepatotoxicity: identification of bioactivable drugs and the potential mechanism of toxicity involved. Arch Toxicol 2013; 87:1115-27. [DOI: 10.1007/s00204-013-1012-x] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2012] [Accepted: 01/17/2013] [Indexed: 11/30/2022]
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Tolosa L, Pinto S, Donato MT, Lahoz A, Castell JV, O’Connor JE, Gómez-Lechón MJ. Development of a Multiparametric Cell-based Protocol to Screen and Classify the Hepatotoxicity Potential of Drugs. Toxicol Sci 2012; 127:187-98. [DOI: 10.1093/toxsci/kfs083] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Boehme K, Dietz Y, Hewitt P, Mueller SO. Activation of P53 in HepG2 cells as surrogate to detect mutagens and promutagens in vitro. Toxicol Lett 2010; 198:272-81. [PMID: 20655369 DOI: 10.1016/j.toxlet.2010.07.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2010] [Revised: 07/10/2010] [Accepted: 07/14/2010] [Indexed: 01/03/2023]
Abstract
The current genotoxicity tests of the standard in vitro battery, especially those using mammalian cells, are limited by their low specificity and highlight the importance of new in vitro tools. This study aimed to evaluate the suitability of HepG2 cells for assaying mutagens and promutagens. We determined P53 activity as surrogate genotoxicity endpoint in HepG2 cells. Our results revealed a significant P53-induction by actinomycin D, methyl methanesulfonate and etoposide. Prior to the investigation of promutagens we characterized HepG2 cells by analyzing the expression of 45 genes involved in xenobiotic metabolism and measuring the activity of selected Cytochrome-P450 (CYP) enzymes. We determined a limited metabolic capacity prompting us to employ a co-treatment with rat liver S9 as metabolic activation system (MAS) for promutagens. While cyclophosphamide showed an elevation of activated P53 in the presence of S9, 7,12-dimethylbenz[a]anthracene and aflatoxin B(1) responded without the MAS. Inhibition of cellular CYP3A4 or CYP1A/1B suppressed the aflatoxin B(1)- and dimethylbenz[a]anthracene-mediated P53 response, respectively, indicating that HepG2 cells are capable of metabolizing these compounds in a CYP1A/B/3A4-dependent manner. In summary, our results indicate that P53 activation in HepG2 cells combined with a MAS can be used for the identification of new (pro)genotoxicants.
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Affiliation(s)
- Kathleen Boehme
- Merck KGaA, Merck Serono, Toxicology, 64293 Darmstadt, Germany
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