Cytotoxic and NF-κB inhibitory sesquiterpene lactones from Piptocoma rufescens |
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Authors: | Ren Yulin Acuña Ulyana Muñoz Jiménez Francisco García Ricardo Mejía Melciades Chai Heebyung Gallucci Judith C Farnsworth Norman R Soejarto Djaja D Carcache de Blanco Esperanza J Kinghorn A Douglas |
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Institution: | Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA. |
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Abstract: | Six new (1-6) and eight known germacranolide-type sesquiterpene lactones, along with several known phenylpropanol coumarates and methylated flavonoids, were isolated from the leaves of Piptocoma rufescens, collected in the Dominican Republic. The new compounds were identified by analysis of their spectroscopic data, with the molecular structure of 3 being established by single-crystal X-ray diffraction. The absolute configurations of the sesquiterpene lactones isolated were determined from their CD and NOESY NMR spectra, together with the analysis of Mosher ester reactions. Bioassay screening results showed the majority of the sesquiterpene lactones isolated (1-13) to be highly cytotoxic toward the HT-29 human colon cancer cell line, with the most potent compound being 15-deoxygoyazensolide (10, IC(50), 0.26 μM). In addition, several of the sesquiterpene lactones exhibited NF-κB (p65) inhibitory activity. |
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