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Bioactive pregnanes from Nerium oleander.
Liming Bai1, Liyan Wang, Ming Zhao
1Graduate School of Science and Technology, Department of Chemistry and Chemical Engineering, Niigata University, Ikarashi, 2-8050, Niigata 950-2181, Japan.
Researchers isolated new pregnanes from Nerium oleander, investigating their anti-inflammatory, cytotoxic, and multidrug resistance-reversal activities. Compound 4 showed anti-inflammatory and cytotoxic effects, while compounds 1, 2, and 5 demonstrated multidrug resistance-reversal properties.
Area of Science:
- Natural Products Chemistry
- Pharmacology
- Medicinal Chemistry
Background:
- Nerium oleander is a plant source of bioactive compounds.
- Pregnanes are a class of steroids with diverse biological activities.
Purpose of the Study:
- To isolate and characterize new pregnane compounds from Nerium oleander.
- To evaluate the anti-inflammatory, cytotoxic, and multidrug resistance-reversal activities of these compounds.
Main Methods:
- Isolation and structural elucidation of compounds using spectroscopic data.
- In vitro assays for anti-inflammatory activity (ICAM-1 inhibition).
- Cytotoxicity assays against human cell lines (WI-38, VA-13, HepG2, A-549).
- Multidrug resistance-reversal assays using calcein accumulation in cancer cells.
Main Results:
- Three new pregnanes (1-3) and two known compounds (4-5) were isolated.
- Compound 4 exhibited anti-inflammatory activity by inhibiting ICAM-1 induction.
- Compound 4 showed significant cytotoxic effects against VA-13 and HepG2 cells.
- Compounds 1, 2, and 5 demonstrated significant multidrug resistance-reversal activity.
Conclusions:
- Nerium oleander yields novel pregnane compounds with potential therapeutic applications.
- Compound 4 possesses anti-inflammatory and cytotoxic properties.
- Compounds 1, 2, and 5 show promise for overcoming multidrug resistance in cancer therapy.
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