Abstract
The effects of hexanoic extracts of Viscum cruciatum Sieber parasitic on Crataegus monogyna Jacq. (I), Crataegus monogyna Jacq. parasitized with Viscum cruciatum Sieber (II), and Crataegus monogyna Jacq. non-parasitized (III), and of a triterpenes enriched fractions isolated from I, II and III (CFI, CFII, CFIII respectively), on the growth of HEp-2 cells have been evaluated. All the samples demonstrated significant cytotoxic activity against cultured HEp-2 cells, and all of them showed a stronger in vitro activity than 6-mercaptopurine solution used as a positive control. With the hexanoic extracts I, II and III almost similar activity was obtained, but the hexanoic extract I showed comparably better results. Almost complete inhibition was observed with triterpenes-enriched fractions CFI, CFII and CFIII, at the dose 6 micrograms/ml, after 72 h of treatment. The most intense response was obtained with the triterpenes-enriched fraction CFIII (from Crataegus monogyna non-parasitized), where the inhibition was 93%, but the fraction CFI and CFII showed similar inhibition (92% and 83%).
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