Additional bioactive Lyso-PAF congeners from the sponge Spirastrella abata.

Area of Science:

• Marine Natural Products Chemistry
• Medicinal Chemistry
• Pharmacology

Background:

• Marine sponges are a rich source of bioactive compounds.
• Platelet-activating factor (PAF) and its analogs have diverse biological activities.
• Lyso-PAF derivatives are less explored but hold potential therapeutic value.

Purpose of the Study:

• To isolate and characterize novel lyso-PAF derivatives from the marine sponge Spirastrella abata.
• To investigate the structural features of these compounds, including unprecedented substitutions.
• To evaluate their biological activities, specifically cholesterol biosynthesis inhibition and cytotoxicity against human tumor cells.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation employing comprehensive spectroscopic methods (NMR, MS).
• In vitro assays for cholesterol biosynthesis inhibition and cytotoxicity screening.

Main Results:

• Isolation of one known and four new lyso-PAF derivatives (compounds 1-5).
• Identification of two unprecedented lyso-PAF derivatives with a C-2' methoxy group.
• Demonstration of inhibitory effects on cholesterol biosynthesis.
• Exhibition of cytotoxic activity against human solid tumor cell lines.

Conclusions:

• Spirastrella abata is a source of novel lyso-PAF derivatives with unique structural features.
• These compounds warrant further investigation for their therapeutic potential in cholesterol-related disorders and cancer.
• The C-2' methoxy group may confer unique biological properties.