Bioactive terpenoids from the Red Sea soft coral Sinularia polydactyla

Area of Science:

• Marine Natural Products Chemistry
• Pharmacology
• Organic Chemistry

Background:

• Marine invertebrates, such as soft corals of the genus Sinularia, are prolific sources of structurally diverse bioactive compounds.
• Previous research indicates Sinularia species produce various terpenoids with potential pharmacological activities.

Purpose of the Study:

• To isolate and characterize chemical constituents from the ethyl acetate extract of Sinularia polydactyla.
• To evaluate the in vitro cytotoxicity and antimicrobial activities of the isolated compounds.

Main Methods:

• Chemical investigation using chromatographic techniques for isolation.
• Structure elucidation of isolated compounds using spectroscopic methods.
• In vitro assays for cytotoxicity (against HepG2, Hep2, HCT cell lines) and antimicrobial activity.

Main Results:

• Three known terpenoids were isolated: 24-methylcholestane-3β,5α,6β,25-tetrol 25-monoacetate (1), 24-methylcholestane-5-en-3β,25-diol (2), and durumolide C (3).
• Durumolide C (3) demonstrated selective cytotoxicity against HepG2 cells (IC50 1.0 μg/mL).
• Compound 1 showed cytotoxicity against Hep2 (IC50 6.1 μg/mL) and HCT (IC50 8.2 μg/mL) cell lines.

Conclusions:

• Sinularia polydactyla is a source of bioactive terpenoids with potential anticancer properties.
• Durumolide C and 24-methylcholestane-3β,5α,6β,25-tetrol 25-monoacetate show promise as leads for anticancer drug development.
• Further investigation into the mechanism of action and optimization of these compounds is warranted.