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Michiba A, Gi M, Yokohira M, Sakurai E, Teramoto A, Kiriyama Y, Yamada S, Wanibuchi H, Tsukamoto T. Early detection of genotoxic hepatocarcinogens in rats using γH2AX and Ki-67: prediction by machine learning. Toxicol Sci 2023; 195:202-212. [PMID: 37527026 DOI: 10.1093/toxsci/kfad073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/03/2023] Open
Abstract
Direct DNA double-strand breaks result in phosphorylation of H2AX, a variant of the histone H2 protein. Phosphorylated H2AX (γH2AX) may be a potential indicator in the evaluation of genotoxicity and hepatocarcinogenicity. In this study, γH2AX and Ki-67 were detected in the short-term responses (24 h after chemical administration) to classify genotoxic hepatocarcinogens (GHs) from non-GH chemicals. One hundred and thirty-five 6-week-old Crl: CD(SD) (SPF) male rats were treated with 22 chemicals including 11 GH and 11 non-GH, sacrificed 24 h later, and immunostained with γH2AX and Ki-67. Positivity rates of these markers were measured in the 3 liver ZONEs 1-3; portal, lobular, and central venous regions. These values were input into 3 machine learning models-Naïve Bayes, Random Forest, and k-Nearest Neighbor to classify GH and non-GH using a 10-fold cross-validation method. All 11 and 10 out of 11 GH caused significant increase in γH2AX and Ki-67 levels, respectively (P < .05). Of the 3 machine learning models, Random Forest performed the best. GH were identified with 95.0% sensitivity (76/80 GH-treated rats), 90.9% specificity (50/55 non-GH-treated rats), and 90.0% overall correct response rate using γH2AX staining, and 96.2% sensitivity (77/80), 81.8% specificity (45/55), and 90.4% overall correct response rate using Ki-67 labeling. Random Forest model using γH2AX and Ki-67 could independently predict GH in the early stage with high accuracy.
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Affiliation(s)
- Ayano Michiba
- Department of Diagnostic Pathology, Graduate School of Medicine, Fujita Health University, Toyoake, Aichi 470-1192, Japan
| | - Min Gi
- Department of Environmental Risk Assessment, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Osaka 545-8585, Japan
| | - Masanao Yokohira
- Departments of Medical Education and Pathology and Host-Defense, Faculty of Medicine, Kagawa University, Miki-cho, Kagawa 761-0793, Japan
| | - Eiko Sakurai
- Department of Diagnostic Pathology, Graduate School of Medicine, Fujita Health University, Toyoake, Aichi 470-1192, Japan
| | - Atsushi Teramoto
- Faculty of Information Engineering, Meijo University, Nagoya, Aichi 468-8502, Japan
| | - Yuka Kiriyama
- Department of Diagnostic Pathology, Graduate School of Medicine, Fujita Health University, Toyoake, Aichi 470-1192, Japan
- Department of Pathology, Narita Memorial Hospital, Toyohashi, Aichi 441-8029, Japan
| | - Seiji Yamada
- Department of Diagnostic Pathology, Graduate School of Medicine, Fujita Health University, Toyoake, Aichi 470-1192, Japan
| | - Hideki Wanibuchi
- Department of Molecular Pathology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Osaka 545-8585, Japan
| | - Tetsuya Tsukamoto
- Department of Diagnostic Pathology, Graduate School of Medicine, Fujita Health University, Toyoake, Aichi 470-1192, Japan
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Asaoka Y, Sakai H, Hirata A, Sasaki J, Goryo M, Miyamoto Y, Yanai T, Masegi T, Okada K. Detection of initiation activity of 1,2-dimethylhydrazine in in vivo medium-term liver initiation assay system using 4-week-old rats without hepatocellular proliferative stimuli during the test chemical treatment period. J Vet Med Sci 2009; 72:43-53. [PMID: 19915331 DOI: 10.1292/jvms.09-0297] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We have developed an in vivo medium-term liver initiation assay system to detect initiation activities of chemicals on multi-organ carcinogenesis. However, cell proliferation stimuli during the test chemical treatment period, required in the previously used assay models using adult rats, are laborious; moreover, those cause decrease of hepatic metabolic enzymes and psychological and physical discomfort to animals resulting in inaccurate interpretation. Therefore, we investigated the utility of another in vivo medium-term liver initiation assay model using 4-week-old rats without the cell proliferation stimuli. In this study, we confirmed that 4-week-old and 4.5-week-old male rats have high hepatocyte proliferation activity and similar enzyme activities of hepatic Cytochrome P450 subtypes as compared with 8-week-old male rats. Next, the in vivo medium-term liver initiation assay model using 4-week-old rats without cell proliferation stimuli was evaluated for the detection of the initiation activity of 1,2-dimethylhydrazine (DMH), which is a well-known genotoxic carcinogen. Four-week-old rats were orally administered DMH (single dose, 4 or 16 mg/kg; or 4-day repeat, 1 or 4 mg/kg); subsequently, these rats were treated promotion treatment consisted of administration of 2-acetylaminofluorene and carbon tetrachloride. Four weeks after the first DMH administration, the glutathione S-transferase placental form (GST-P)-positive foci induced by DMH in the liver was measured immunohistochemically. The inductions of GST-P-positive foci in all DMH-treated groups were dose-dependent, duration-dependent and significantly higher than that in non-DMH-treated group. From these results, our assay model was detected the initiation activity of DMH simply, and would be useful to evaluate the carcinogenicity of chemicals.
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Affiliation(s)
- Yoshiji Asaoka
- Pathogenetic Veterinary Science, United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan
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Asaoka Y, Sakai H, Takahashi N, Hirata A, Tsukamoto T, Yamamoto M, Yanai T, Masegi T, Tatematsu M. Intraperitoneal injection ofd-galactosamine provides a potent cell proliferation stimulus for the detection of initiation activities of chemicals in rat liver. J Appl Toxicol 2005; 25:554-61. [PMID: 16208626 DOI: 10.1002/jat.1095] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
In an in vivo 5-week initiation assay model, chemical hepatectomy by hepato-toxicant administration was utilized as a cell proliferation stimulus as an alternative to the two-thirds partial hepatectomy. The study investigated the effect of an intraperitoneal (i.p.) injection of D-galactosamine (D-gal) for this purpose in a medium-term liver bioassay, with a further focus on cell proliferation kinetics and cytochrome P450 (CYP) expression. In experiment I, cell proliferation in rat liver after a single administration of D-gal (700 mg kg(-1), i.p.) was analysed by the bromodeoxyuridine (BrdU) labeling method, and CYP isozymes were quantified by immunoblotting. In experiment II, the induction of glutathione S-transferase placental form (GST-P) positive foci by 1,2-dimethylhydrazine (DMH) was evaluated in a modified in vivo 5-week initiation assay model. At 84 hours after single administration of d-gal (i.p.) the BrdU index was markedly elevated (27.5% +/- 9.5%). Although CYP 2E1 and 1A2 apoprotein contents decreased transiently to less than 20% of the control level, subsequently they recovered to 60% and 40% of the control level, respectively, at 84 hours. Induction of GST-P positive foci in the group given DMH at 84 hours after a single administration of d-gal was significantly greater than in the control group, correlating with the kinetics of cell proliferation. In conclusion, the sensitivity of the present initiation assay using D-gal i.p. is high, so that D-gal i.p. can be considered an effective cell proliferation stimulus.
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Affiliation(s)
- Yoshiji Asaoka
- Department of Veterinary Pathology, Gifu University, Yanagido 1-1, Gifu, 501-1193, Japan
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Okamura M, Sakai H, Takahashi N, Inagami A, Tsukamoto T, Yamamoto M, Shirai N, Iidaka T, Yanai T, Masegi T, Tatematsu M. The Effects of Allyl Alcohol-induced Cell Proliferation for Detection of Initiation Activities of Chemicals in Rat Liver. J Toxicol Pathol 2002. [DOI: 10.1293/tox.15.95] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Miwa Okamura
- Department of Veterinary Pathology, Gifu University
| | - Hiroki Sakai
- Department of Veterinary Pathology, Gifu University
- Laboratory of Oncological Pathology, Aichi Cancer Center Research Institute
| | | | - Atsushi Inagami
- Developmental Safety Assessment Research Drug & Disposition Research Laboratories Eisai Co., Ltd
| | - Tetsuya Tsukamoto
- Laboratory of Oncological Pathology, Aichi Cancer Center Research Institute
| | - Masami Yamamoto
- Laboratory of Oncological Pathology, Aichi Cancer Center Research Institute
| | - Norimitsu Shirai
- Laboratory of Oncological Pathology, Aichi Cancer Center Research Institute
| | - Takashi Iidaka
- Laboratory of Oncological Pathology, Aichi Cancer Center Research Institute
| | - Tokuma Yanai
- Department of Veterinary Pathology, Gifu University
| | | | - Masae Tatematsu
- Laboratory of Oncological Pathology, Aichi Cancer Center Research Institute
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