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Clement JA, Bleich RM, Campbell HE, Naylor K, Flood MJ, Kelly RM, Wu SB, Kennelly EJ, Schmitt JD. Cytotoxic oplopane sesquiterpenoids from Arnoglossum atriplicifolium. Nat Prod Res 2015; 30:2028-33. [PMID: 26540019 DOI: 10.1080/14786419.2015.1107063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Pale Indian plantain (Arnoglossum atriplicifolium (L.) H. Rob.) is a plant with traditional medicinal usage among the Cherokee Native American tribe for treating cancer. Two oplopane sesquiterpenoids were isolated from an extract of A. atriplicifolium from Western North Carolina. The compounds were isolated by bioassay-guided fractionation using an MCF-7 breast tumour cell line assay. The known compound (1S,6R,7R,8R)-1-acetoxy-6,7-diangeloxy-8,10-epoxy-2-oxo-oplopa-3,14Z,11,12-dien-13-al (1) had an EC50 value of 9.0 μM against MCF-7 cells, while the new compound (1S,3R,6R,7R,8R,11S)-1-acetoxy-6,7-diangeloxy-8,10,11,13-bisepoxyoplopan-2-one (2) had an EC50 value of 96 μM. The compounds were characterised by 1D and 2D NMR spectroscopy and by comparison with literature values in the case for 1. Based on NOESY analysis, a correction of the relative configuration for 1 is presented. The presence of these compounds may help to explain the folk remedy usage of this plant as an anticancer agent.
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Affiliation(s)
- Jason A Clement
- a Department of Chemistry and Physics , Western Carolina University , Cullowhee , NC , USA.,b Natural Products Discovery Institute , Baruch S. Blumberg Institute , Doylestown , PA , USA
| | - Rachel M Bleich
- a Department of Chemistry and Physics , Western Carolina University , Cullowhee , NC , USA
| | - Hailey E Campbell
- a Department of Chemistry and Physics , Western Carolina University , Cullowhee , NC , USA
| | - Kristin Naylor
- a Department of Chemistry and Physics , Western Carolina University , Cullowhee , NC , USA
| | - Matthew J Flood
- a Department of Chemistry and Physics , Western Carolina University , Cullowhee , NC , USA
| | | | - Shi-Biao Wu
- d Department of Biological Sciences, Lehman College , City University of New York , Bronx , NY , USA
| | - Edward J Kennelly
- d Department of Biological Sciences, Lehman College , City University of New York , Bronx , NY , USA
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