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MECHANISMS OF THE TUMOR PROMOTING EFFECT OF 12-0-TETRADECANOYL PHORBOL 13-ACETATE ON THE ETHYLNITROSOUREA INDUCED TRANSPLACENTRAL NEUROGENIC CARCINOGENESIS Takashi Kokunai 1 , Norihiko Tamaki 1 , Satoshi Matsumoto 1 1Department of Neurosurgery, Kobe University School of Medicine pp.397-402
Published Date 1984/4/1
DOI https://doi.org/10.11477/mf.1406205306

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  • Abstract
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To investigate the mechanisms of the tumor promoter, 12-0-tetradecanoyl phorbol 13-acetate (TPA), chromosomal change, 〔3H〕-thymidine in-corporation, DNA histogram pattern, and the cel-lular contents of protein, RNA, and DNA were analyzed with in vivo-in vitro assay to ethylni-trosourea (ENU) induced transplacentral neuroge-nic carcinogenesis. The earlier appearance of chromatid breaks and exchanges was found in the ENU group treated with TPA than that in the ENU group treated with or without acetone. From the findings of cellular DNA contents and DNA histogram pattern, the rapidly increased percentage of G2-M phased population and the rapid increase of cellular DNA contents were found in the ENU group treated with TPA compared to the ENU group. And the more rapid increase of 〔3H〕-thy-midine incorporation was found in the ENU group treated with TPA than that in the ENU group. The findings of chromosomal changes, DNA his-togram pattern, 〔3H〕-thymidine incorporation, and cellular DNA content in the control group did not differ from that in the control group treated with TPA. Above results seem to be indicated that TPA might modulate the metabolism of nu-cleic acids and the regulation of gene expression damaged initially by ENU.


Copyright © 1984, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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