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Cytotoxic indole alkaloids from Tabernaemontana divaricata
Mei-Fen Bao1, Ju-Ming Yan, Gui-Guang Cheng
1State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China.
Journal of Natural Products
|August 16, 2013
Summary
New bisindole alkaloids from Tabernaemontana divaricata, tabernaricatines A-E, were discovered. Conophylline demonstrated significant cytotoxicity against multiple human cancer cell lines.
Area of Science:
- Natural Product Chemistry
- Pharmacology
- Medicinal Chemistry
Background:
- Tabernaemontana divaricata is a plant source of diverse indole alkaloids.
- Bisindole alkaloids, particularly vobasinyl-ibogan types, are of interest for their biological activities.
- Previous research has identified numerous bioactive compounds from this plant genus.
Purpose of the Study:
- To isolate and characterize new bisindole alkaloids from Tabernaemontana divaricata.
- To evaluate the cytotoxic potential of isolated compounds against human cancer cell lines.
- To investigate novel structural motifs in vobasinyl-ibogan-type alkaloids.
Main Methods:
- Phytochemical investigation involving extraction and isolation techniques (e.g., chromatography).
- Structure elucidation using spectroscopic methods (NMR, MS).
- In vitro cytotoxicity assays against a panel of human cancer cell lines (HL-60, SMMC-7721, A-549, MCF-7, SW480).
Main Results:
- Five new vobasinyl-ibogan-type bisindole alkaloids, tabernaricatines A-E (1-5), and two new monomers, tabernaricatines F and G (6-7), were identified.
- Alkaloids 1 and 2 represent the first vobasinyl-ibogan-type alkaloids with a unique six-membered ring formed by an ether linkage.
- Conophylline exhibited potent cytotoxicity against all tested cancer cell lines, with IC50 values ranging from 0.17 to 1.49 μM.
Conclusions:
- The study successfully isolated and characterized novel bisindole alkaloids from Tabernaemontana divaricata.
- The identified compounds, particularly conophylline, display significant anticancer potential.
- The discovery of unique structural features in alkaloids 1 and 2 expands the chemical diversity of vobasinyl-ibogan alkaloids.
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