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Acetylated dammarane-type bisdesmosides from Combretum inflatum
Russell B Williams1, Vanessa L Norman, Matt G Goering
1Lead Discovery and Rapid Structure Elucidation Group, Sequoia Sciences, Inc. , 1912 Innerbelt Business Center Drive, St. Louis, Missouri 63114, United States.
Seven novel compounds from Combretum inflatum show promise. Some compounds inhibit Methicillin-resistant Staphylococcus aureus (MRSA) growth and exhibit cytotoxicity in human lung cancer cells, indicating potential therapeutic applications.
Area of Science:
- Natural Product Chemistry
- Medicinal Chemistry
- Pharmacology
Background:
- Combretum inflatum is a plant species with unexplored chemical constituents.
- Dammarane-type bisdesmosides are a class of natural products with diverse biological activities.
Purpose of the Study:
- To isolate and characterize new chemical constituents from Combretum inflatum.
- To evaluate the isolated compounds for antimicrobial and cytotoxic activities.
Main Methods:
- Isolation of compounds using microgram-scale techniques.
- Structure elucidation employing advanced spectroscopic methods (e.g., Bruker BioSpin TCI 1.7 mm MicroCryoProbe, ESIMS) and literature data comparison.
- Screening for inhibition of Escherichia coli biofilm, Methicillin-resistant Staphylococcus aureus (MRSA), and cytotoxicity in NCI-H460 human lung cancer cells.
Main Results:
- Seven new acetylated dammarane-type bisdesmosides (compounds 1-7) were successfully isolated and characterized.
- Compounds 3-7 demonstrated significant inhibition of MRSA growth, reducing it by 45-71% at 16 μg/mL.
- Compound 7 exhibited notable cytotoxicity against NCI-H460 human lung cancer cells with an IC₅₀ value of 3.9 μM.
Conclusions:
- The chemical investigation of Combretum inflatum yielded novel dammarane-type bisdesmosides.
- Compounds 3-7 possess promising antimicrobial activity against MRSA.
- Compound 7 shows potential as an anticancer agent against human lung cancer cells.
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