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논문 기본 정보

자료유형
학술저널
저자정보
Kim, Seung-Hee (Department of Pharmacology, Korea Food and Drug Administration) Han, Hyung-Mee (Department of Pharmacology, Korea Food and Drug Administration) Kang, Seog-Youn (Department of Pharmacology, Korea Food and Drug Administration) Jung, Ki-Kyung (Department of Pharmacology, Korea Food and Drug Administration) Kim, Tae-Gyun (Department of Pharmacology, Korea Food and Drug Administration) Oh, Hye-Young (Department of Toxicology, Korea Food and Drug Administration) Lee, Young-Kyung (Office of Technical Advisor, Korea Food and Drug Administration) Rheu, Hang-Mook (Department of Pharmacology, Korea Food and Drug Administration)
저널정보
대한약학회 Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea 제22권 제5호
발행연도
1999.1
수록면
474 - 478 (5page)

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초록· 키워드

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Modulation of unscheduled DNA synthesis by dehydroepiandrosterone (DHEA) after exposure to various chemical carcinogens was investigated in the primary rat hepatocytes. Unscheduled DNA synthesis was induced by treatment of such direct acting carcinogens as methly methanesulfonate (MMS) and ethyl methanesulfonate (EMS) or procarcinogens including benzo(a)pyrene (BaP) and 7, 12-dimethylbenz(a)anthracene (DMBA). Unscheduled DNA synthesis was determined by measuring [methyl-3H]thymidine radioactivity incorporated into nuclear DNA of hepatocytes treated with carcinogens in the presence or absence of DHEA. Hydroxyurea $(5{\times}10^{-3} M)$was added to growth medium to selectively suppress normal replication. DHEA at concentrations ranging from $(1{\times}10^{-6} M)$ to$(5{\times}10^{-4} M)$ did not significantly inhibit unscheduled DNA synthesis induced by either MMS $(1{\times}10^{-4} M)$ or EMS $(1{\times}10^{-2} M)$. In contrast, DHEA-significantly inhibited unscheduled DNA synthesis induced by BaP $(6.5{\times}10^{-5} M)$ and DMBA.$(2{\times}10^{-5} M)$. DHEA-induced hepatotoxicity in rats was examined using lactate dehydrogenase (LDH) release as an indicator of cytotoxicity. DHEA exhibit no significant increase in LDH release compared with the control at 18 h. These data suggest that nontoxic concentration of DHEA does not affect the DNA excision repair process, but it probably influence the enzymatic system responsible for the metabolic activation of procarcinogens and thereby decreases the amount of the effective DNA adducts formed by the ultimate reactive carcinogenic species.

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