Probing Anti-Proliferative 24-Homoscalaranes from a Sponge Lendenfeldiasp

Area of Science:

• Marine Natural Products Chemistry
• Organic Chemistry
• Pharmacology

Background:

• Marine sponges are a rich source of structurally diverse secondary metabolites.
• Scalarane derivatives, a class of marine natural products, have demonstrated various biological activities.
• The sponge genus *Lendenfeldia* is known to produce unique scalarane compounds.

Purpose of the Study:

• To isolate and characterize new scalarane derivatives from the sponge *Lendenfeldia* sp.
• To evaluate the cytotoxic and anti-proliferative potential of isolated compounds against human cancer cell lines.
• To investigate the structure-activity relationship, particularly the role of the 18-aldehyde functionality.

Main Methods:

• Isolation of compounds using spectroscopic pattern-based procedures, primarily Nuclear Magnetic Resonance (NMR).
• Structure elucidation of novel and known scalaranes (1-7) through comprehensive spectroscopic analysis.
• Cytotoxicity assays against a panel of human cancer cell lines.

Main Results:

• Four new 24-homoscalaranes, lendenfeldaranes A-D (1-4), were identified.
• Three known compounds, including 12α-acetoxy-22-hydroxy-24-methyl-24-oxoscalar-16-en-25-al (5), felixin F (6), and 24-methyl-12,24,25-trioxoscalar-16-en-22-oic acid (7), were also isolated.
• Compounds 5 and 7 exhibited significant anti-proliferative activity, with the 18-aldehyde functionality identified as a key structural feature for this activity.

Conclusions:

• The study successfully identified novel scalarane derivatives from *Lendenfeldia* sp.
• Compounds 5 and 7 demonstrate promising anti-cancer properties, highlighting their therapeutic potential.
• The presence of an 18-aldehyde group is critical for the observed anti-proliferative effects of these scalaranes.