FORMATION OF 8-HYDROXY-2'-DEOXYGUANOSINE IN EPIDERMIS OF HAIRLESS MICE EXPOSED TO NEAR-UV

被引:77
作者
HATTORINAKAKUKI, Y
NISHIGORI, C
OKAMOTO, K
IMAMURA, S
HIAI, H
TOYOKUNI, S
机构
[1] KYOTO UNIV,FAC MED,DEPT PATHOL,SAKYO KU,KYOTO 606,JAPAN
[2] KYOTO UNIV,FAC MED,DEPT DERMATOL,SAKYO KU,KYOTO 606,JAPAN
关键词
D O I
10.1006/bbrc.1994.1823
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Six-week-old male albino hairless mice (Hos: Hr-1) were exposed to a near-ultraviolet (UV) fluorescent sun lamp (33.5 kJ/m(2)/hr; wave length > 270 nm with a peak at 312.5 nm) to investigate the induction of oxidative DNA damage in epidermal cells. Significantly higher levels of 8-hydroxy-2'-deoxyguanosine (8-OHdG) were detected in a dose-dependent manner in epidermis of mice exposed to near-UV than in those of control animals. The ratio of 8-OHdG in near-UV-exposed/unexposed control mas 2.08 +/- 0.19 after 168 kJ/m(2) exposure, P < 0.01; 3.49 +/- 0.36 after 335 kJ/m(2) exposure, P < 0.01 (means +/- SE). The levels of 8-OHdG decreased with time after near-UV exposure, suggesting the presence of removal andlor repair mechanisms. This is the first report that oxidative DNA base modification is induced in vivo in epidermal cells by near-UV exposure. Oxidative DNA base modification may be one of the causes of sunlight-induced skin carcinogenesis. (C) 1994 Academic Press, Inc.
引用
收藏
页码:1132 / 1139
页数:8
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