Abstract
To explore the antitumor activities of kushen (Sophora flavescens) flavonoids (KS-Fs) in vivo and in vitro. Cell proliferation was assayed by using methyl thiazolyl tetrazolium (MTT) method. H22 hepatocellular carcinoma and S180 sarcoma were induced in ICR mice. Lewis lung carcinoma was induced in C57BL/6 mice. H460 and Eca-109 tumor were induced in Balb/c nude mice by injecting 5x10(5) or 5x10(6) tumor cells in the right flank, respectively. KS-Fs could inhibit the growth of a variety of human tumor cell lines (A549, SPC-A-1, NCI-H460, etc.) in vitro. The antitumor efficacies were confirmed in the mice models of H22, S180 and Lewis lung tumors and the nude mice models of human H460 and Eca-109 xenografted tumors. The oral or intravenous maximum tolerated dose of KS-Fs was more than 2.8 g/kg or 750 mg/kg respectively, far more than the oral medial lethal dose of kushen alkaloids (< or = 1.18 g/kg). No adverse reactions were observed. These results suggest that KS-Fs or kurarinone may be developed as a novel antitumor agent.
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