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A new cycloartane glucoside from Rhizophora stylosa
Rhizophora stylosa leaves yielded nine compounds, including a novel cycloartane glucoside, rhizostyloside. This new compound demonstrated significant anticancer activity against multiple human cancer cell lines.
Area of Science:
- Phytochemistry
- Natural Products Chemistry
- Pharmacology
Background:
- Mangrove species like Rhizophora stylosa are recognized sources of bioactive natural products.
- Secondary metabolites from plants are extensively studied for their therapeutic potential, particularly in oncology.
Purpose of the Study:
- To isolate and characterize secondary metabolites from Rhizophora stylosa leaves.
- To evaluate the cytotoxic and apoptotic effects of isolated compounds against human cancer cell lines.
Main Methods:
- Methanol extraction of Rhizophora stylosa leaves followed by extensive chromatographic purification.
- Structural elucidation using advanced Nuclear Magnetic Resonance (NMR) spectroscopy (1H, 13C NMR, HSQC, HMBC, 1H-1H COSY, NOESY) and High-Resolution Electrospray Ionization Mass Spectrometry (HR-ESI-MS).
- Cytotoxicity assays against KB, LU-1, and SK-Mel-2 cancer cell lines and caspase-3/7 activation assays.
Main Results:
- Nine secondary metabolites were isolated, including a new cycloartane glucoside, named rhizostyloside (1).
- Rhizostyloside (1) exhibited significant cytotoxicity against KB (epidermoid carcinoma), LU-1 (lung adenocarcinoma), and SK-Mel-2 (melanoma) cell lines.
- Compound 1 demonstrated potent activation of caspase-3/7 in LU-1 cells, indicating induction of apoptosis.
Conclusions:
- Rhizophora stylosa is a valuable source of structurally diverse secondary metabolites.
- Rhizostyloside, a novel cycloartane glucoside, possesses significant anticancer properties and induces apoptosis in cancer cells.
- Further investigation into rhizostyloside is warranted for its potential development as an anticancer therapeutic agent.
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