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- W1982177778 abstract "Oldenlandia diffusa (OD) and Scutellaria barbata (SB) have been used in traditional Chinese medicine for treating liver, lung and rectal tumors. We previously showed that they inhibited mutagenesis, DNA binding and metabolism of benzo[a]pyrene (BaP) and aflatoxin B1 (AFB1) bioactivated by Aroclor 1254-induced rat hepatic S9. The purpose of this study was to investigate the effects of OD and SB on the cytochrome P-450IA1-mediated mutagenicity of BaP in Salmonella typhimurium TA100 using beta-naphthoflavone (beta NF)-induced rat hepatic S9. We also determined the effects of OD and SB on cytochrome P-450IA1-linked ethoxyresorufin O-deethylase (EROD) activity in beta NF-induced hepatic microsomes. In addition, we studied the effects of these two herbs on BaP metabolite binding to calf thymus DNA and using high performance liquid chromatography (HPLC) we investigated the effects of OD and SB on the metabolism of BaP by beta NF-induced S9. Our experimental results showed that OD and SB inhibited the mutagenicity of BaP in the presence of either non-induced or beta NF-induced S9. SB significantly inhibited BaP binding to DNA. These effects correlated with the inhibition of cytochrome P-450IA1-linked EROD activity in beta NF-induced microsomes and with an inhibition of beta NF-induced S9 mediated metabolism of [3H]BaP as determined by HPLC. These results suggest that OD and SB may possess antimutagenic activity by inhibiting P-450IA-mediated metabolism of BaP." @default.
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- W1982177778 date "1993-01-01" @default.
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- W1982177778 title "Modulation of cytochrome P-450IA1-mediated mutagenicity, DNA binding and metabolism of benzo[a]pyrene by Chinese medicinal herbs" @default.
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- W1982177778 doi "https://doi.org/10.1016/0304-3835(93)90222-u" @default.
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