Biologically active indole alkaloids from Kopsia arborea
Kuan-Hon Lim1, Osamu Hiraku, Kanki Komiyama
1Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
Journal of Natural Products
|August 2, 2007
Summary
Researchers discovered nine new indole alkaloids from Kopsia arborea stem bark. One compound, valparicine, demonstrated significant cytotoxic effects against cancer cell lines.
Area of Science:
- Natural Product Chemistry
- Pharmacognosy
- Medicinal Chemistry
Background:
- Kopsia arborea is a plant species known to produce various indole alkaloids.
- Indole alkaloids are a diverse class of natural products with a wide range of biological activities.
Purpose of the Study:
- To isolate and characterize novel indole alkaloids from the stem bark of Kopsia arborea.
- To evaluate the cytotoxic potential of the isolated compounds.
Main Methods:
- Extraction and isolation of compounds from Kopsia arborea stem bark.
- Structure elucidation using Nuclear Magnetic Resonance (NMR) and Mass Spectrometry (MS) analyses.
- Cytotoxicity assays against KB and Jurkat cell lines.
Main Results:
- Nine new indole alkaloids, including rhazinoline, methoxytubotaiwine isomers, kopsamidines, kopsinidines, paucidactine C, and pericine N-oxide, were identified.
- Several previously reported novel and known indole alkaloids were also isolated.
- Valparicine exhibited potent cytotoxic effects against KB and Jurkat cells with IC(50) values of 13.0 and 0.91 microM, respectively.
Conclusions:
- The chemical investigation of Kopsia arborea stem bark yielded a rich array of indole alkaloids.
- The findings highlight the potential of Kopsia arborea as a source of novel bioactive natural products.
- Valparicine represents a promising lead compound for further development as an anticancer agent.
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