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Cytotoxic pentacyclic triterpenoids from Combretum oliviforme
Xiao-Peng Wu1, Chang-Ri Han, Guang-Ying Chen
1Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education, College of Chemistry & Chemical Engineering, Hainan Normal University, Haikou, China 571158.
Natural Product Communications
|August 26, 2010
Summary
Four pentacyclic triterpenoids from Combretum oliviforme Chao leaves showed cytotoxic activity against human cancer cell lines. The acetyl group in the triterpene structure is essential for this observed cytotoxic effect.
Area of Science:
- Natural Products Chemistry
- Pharmacology
- Medicinal Chemistry
Background:
- Combretum oliviforme Chao is a plant source of bioactive compounds.
- Pentacyclic triterpenoids are a class of natural products with diverse biological activities.
- Investigating novel compounds from natural sources is crucial for drug discovery.
Purpose of the Study:
- To isolate and characterize pentacyclic triterpenoids from Combretum oliviforme Chao leaves.
- To evaluate the in vitro cytotoxic activity of isolated compounds against human cancer cell lines.
- To determine the structure-activity relationship, particularly the role of acetyl groups.
Main Methods:
- Isolation of compounds using chromatographic techniques.
- Structure elucidation using Nuclear Magnetic Resonance (NMR) and Electrospray Ionization Mass Spectrometry (ESIMS).
- In vitro cytotoxicity assays against human lung (SPC-A-1), erythroleukaemic (K562), and gastric (SGC-7901) cancer cell lines.
Main Results:
- Four pentacyclic triterpenoids (1-4) were isolated from C. oliviforme Chao leaves, with compound 3 being a novel natural product.
- Hydrolysis of compounds 2 and 4 yielded 23-hydroxyimberbic acid (5).
- Compounds 1, 3, 4, and 5 exhibited significant cytotoxic activity against the tested cancer cell lines, with IC50 values ranging from 0.69 to 69.68 microM.
Conclusions:
- Pentacyclic triterpenoids from Combretum oliviforme Chao possess cytotoxic properties.
- The presence of an acetyl group in the triterpene aglycone structure is crucial for cytotoxic activity.
- These findings highlight the potential of C. oliviforme Chao as a source for anticancer drug leads.
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