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http://dx.doi.org/10.4014/jmb.0804.253

Rengyolone Inhibits Apoptosis via Etoposide-Induced Caspase Downregulation  

Kim, Jin-Hee (Korea Research Institute of Bioscience and Biotechnology)
Lee, Choong-Hwan (Department of Bioscience and Biotechnology, Konkuk University)
Publication Information
Journal of Microbiology and Biotechnology / v.19, no.3, 2009 , pp. 286-290 More about this Journal
Abstract
In the course of screening for substances inhibiting apoptosis of U937 human leukemia cells induced by etoposide ($10\;{\mu}g/ml$), Forsythiae fructus, which showed a high level of inhibition, was selected. The regulating compounds were purified from the ethyl acetate extract by silica gel column chromatography and HPLC. The active substance was purified and identified as rengyolone by spectroscopic methods. This compound showed inhibitory activity on caspase-3 induction, a major protease of the apoptosis cascade, with an $IC_{50}$ value of $38.96\;{\mu}M$ after 8 h of etoposide treatment in U937 cells. The expression level of caspase-3 and poly(ADP-ribose) polymerase (PARP) were dose-dependently inhibited by the compound, suggesting that rengyolone inhibits etoposide-induced apoptosis via downregulation of caspases.
Keywords
Apoptosis; U937 cells; rengyolone;
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