Aberrant Expression of Cyclin D1 in Pulmonary Proliferative Lesions Induced by High Doses of Urethane in Transgenic Mice Carrying the Human Prototype c-H-ras Gene
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概要
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In our previous study, when rasH2 mice and non-transgenic (non-Tg) littermates were injected intraperitoneally with 1,000 mg/kg of urethane once or three times at two-day intervals, the incidence of lung proliferative lesions in rasH2 mice given triple doses of urethane was significantly increased, compared to that in rasH2 mice given a single dose of urethane, and the mutation frequency of the transgene in lung tumors in rasH2 mice given triple doses was lower than that in rasH2 mice given a single dose of urethane. In the present study, differential immunohistochemical expressions of Cyclin D1 and PCNA, that lead to abnormal cell proliferation and tumor development due to uncontrolled G1-S transition in the cell cycle, as well as p53 tumor suppressor gene in pulmonary proliferative lesions obtained from our previous study were investigated. Over-expression of Cyclin D1 in hyperplasias in rasH2 mice given triple doses was significantly increased, compared to that in the single-injection group, but no significant differences in Cyclin D1 between the single and triple injection groups were observed in hyperplasias in non-Tg mice or lung tumors in either rasH2 or non-Tg mice. There were no differences in the PCNA labeling index of hyperplasias in rasH2 or non-Tg mice between the triple-injection and single-injection groups, while the PCNA labeling index tended to be increased in the tumor, compared with that in hyperplasias. There was neither mutation of p53 nor an increase in immunoreactivity of wild type p53 in these proliferative lesions. These results suggest that cyclin D1 over-expression in alveolar/bronchiolar hyperplasias in rasH2 mice in the triple-injection group is not only indicative of a high cell proliferation rate but also of an important role in the process of malignant transformation.
著者
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MASEGI Toshiaki
Department of Veterinary Pathology, Gifu University
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MITSUMORI Kunitoshi
Division of Pathology, National Institute of Health Sciences
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Hayashi Shim-mo
Drug Analysis And Pharmacokinetics Research Laboratories Takeda Chemical Industries Ltd.
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Nomura Tatsuji
Central Institute For Experimental Animals
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Mitsumori Kunitoshi
Division Of Pathology National Institute Of Health Sciences
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Mori Ikuo
Drug Safety Research Laboratories Takeda Chemical Industries Ltd.
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Nonoyama Takashi
Drug Safety Research Laboratories Takeda Chemical Industries Ltd.
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Yasuhara Kazuo
Division Of Medicinal Chemistry And Pharmacognosy Ohio State University
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Masegi Toshiaki
Department Of Gastroenterology And Metabolism Nagoya City University Graduate School Of Medical Scie
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YANAI Tokuma
Department of Pathogenetic Veterinary Sciences, United Graduate School of Veterinary Sciences, Gifu University, 1–1 Yanagido, Gifu 501–1193, Japan
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Yasuhara Kazuo
Division of Pathology, National Institute of Health Sciences
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HAYASHI Shim-mo
Drug Analysis and Pharmacokinetics Research Laboratories Drug Safety Research Laboratories Takeda Chemical Industries, Ltd.
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MORI Ikuo
Drug Analysis and Pharmacokinetics Research Laboratories Drug Safety Research Laboratories Takeda Chemical Industries, Ltd.
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NONOYAMA Takashi
Drug Analysis and Pharmacokinetics Research Laboratories Drug Safety Research Laboratories Takeda Chemical Industries, Ltd.
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