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Bio-antimutagenic effects of tannic acid on UV and chemically induced mutagenesis in Escherichia coli B/r.

作者信息

Shimoi K, Nakamura Y, Tomita I, Kada T

出版信息

Mutat Res. 1985 Mar;149(1):17-23. doi: 10.1016/0027-5107(85)90004-1.

DOI:10.1016/0027-5107(85)90004-1
PMID:3919292
Abstract

Tannic acid suppressed the mutagenesis in E. coli B/r WP2 trp- induced by UV or 4-nitroquinoline 1-oxide (4NQO), but not that induced by gamma-rays or N-methyl-N'-nitro-N-nitrosoguanidine (MNNG). The depression of mutations induced by UV was most remarkable in the DNA-repair-proficient strain (WP2). Tannic acid, however, showed no bio-antimutagenic effect in the excision repair-deficient strain (WP2s uvrA- or ZA159 uvrB-) under the test conditions where no cellular toxicity was observed. The effect ceased within 30 min after UV irradiation. The inhibition of the expression of Trp+ phenotype and the delay of the first cell division after UV irradiation were not observed in the presence of tannic acid. From these results we conclude that tannic acid may enhance the excision-repair system probably by activating the repair enzymes or by interacting with DNA.

摘要

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