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  • Title: Identification of natural compounds with anti-hepatitis B virus activity from Rheum palmatum L. ethanol extract.
    Author: Li Z, Li LJ, Sun Y, Li J.
    Journal: Chemotherapy; 2007; 53(5):320-6. PubMed ID: 17785969.
    Abstract:
    BACKGROUND: Hepatitis B virus (HBV) infection is a severe health problem in the world; however, there is still no satisfactory therapeutic strategy for the HBV infection. In search for new anti-HBV agents with higher efficiency and less side effects, the anti-HBV activities of traditional Chinese medicine Rheum palmatum L. ethanol extract (RPE) and isolated anthraquinones were evaluated. METHODS: The anti-HBV activities of RPE and isolated anthraquinones were demonstrated in a stable HBV-producing cell line HepG2 2.2.15 by using real-time polymerase chain reaction (PCR), enzyme-linked immunosorbent assay (ELISA) and Southern blot analysis. RESULTS: RPE could inhibit HBV-DNA production and HBsAg expression in a dose-dependent manner. The concentration of 50% HBV-DNA inhibition (IC(50)) of RPE was calculated at 212.36 +/- 11 microg/ml. Six anthraquinones were isolated from RPE by using RP-HPLC. Five free anthraquinones showed weakly or slightly inhibitory activities against HBV. The only combined anthraquinone chrysophanol 8-O-beta-D-glucoside exhibited significant activity against HBV DNA production and antigens expression with an IC(50) value of 36.98 +/- 2.28 microg/ml on HBV DNA inhibition. Endogenous HBV DNA polymerase activity assay indicated that chrysophanol 8-O-beta-D-glucoside might be a potential inhibitor of the HBV DNA polymerase. CONCLUSIONS: The results suggested that RPE could effectively inhibit HBV. The combined anthraquinone chrysophanol 8-O-beta-D-glucoside is the major active compound in RPE and could be a promising candidate for the development of new anti-HBV drugs in the treatment of HBV infection.
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