Cytotoxic Homoisoflavones from the Bulbs of Bellevalia eigii

J Nat Prod. 2015 Jul 24;78(7):1708-15. doi: 10.1021/acs.jnatprod.5b00357. Epub 2015 Jul 6.

Abstract

Eight new and 10 known compounds were isolated from an organic extract of the bulbs of Bellevalia eigii as part of a search for anticancer leads from native plants of Jordan. Of these, the series of 16 homoisoflavonoids (1-16) comprise the seven new analogues 7-O-methyl-3'-hydroxy-3,9-dihydropunctatin (3), 6-hydroxy-7-O-methyl-3,9-dihydropunctatin (6), 7,4'-di-O-methyl-3'-hydroxy-3,9-dihydropunctatin (9), 7-O-methylpunctatin (10), 7-O-methyl-3'-hydroxypunctatin (13), 5-hydroxy-7,8-dimethoxychroman-4-one (14), and 7-O-methyl-8-demethoxy-3-hydroxy-3,9-dihydropunctatin (15). The known ferulic acid-derived acrylamide (17) and the new methylthioacrylate bellegimycin (18) are also reported. The structures were elucidated using a set of spectroscopic and spectrometric techniques; the absolute configurations of compounds 1-9, 15, and 16 were determined using ECD spectroscopy, while a modified Mosher's ester method was used for compound 18. Optical rotation data for the known compounds 1, 2, and 8 are reported here for the first time. The cytotoxic activities of all compounds were evaluated using the MDA-MB-435 (melanoma) and HT-29 (colon) cancer cell lines. Compounds 4 and 9 were the most potent on the latter cell line, with IC50 values of 1.0 and 1.1 μM, respectively. Compounds 1-18 were assessed for antimicrobial activity using a collection of bacteria and fungi; compounds 4 and 12 showed promising activity against the bacterium Mycobacterium smegmatis with MIC values of 17 and 24 μg/mL, respectively.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • HT29 Cells
  • Humans
  • Inhibitory Concentration 50
  • Isoflavones / chemistry
  • Isoflavones / isolation & purification*
  • Isoflavones / pharmacology*
  • Jordan
  • Liliaceae / chemistry*
  • Microbial Sensitivity Tests
  • Molecular Structure
  • Mycobacterium / drug effects
  • Mycobacterium smegmatis / drug effects
  • Nuclear Magnetic Resonance, Biomolecular
  • Plant Roots / chemistry*
  • Structure-Activity Relationship
  • Vinblastine / pharmacology

Substances

  • Isoflavones
  • Vinblastine