Immunomodulatory Biscembranoids and Assignment of Their Relative and Absolute Configurations: Data Set Modulation in...

Area of Science:

• Natural Products Chemistry
• Marine Biology
• Immunology

Background:

• Soft corals, such as Sarcophyton trocheliophorum, are rich sources of bioactive secondary metabolites.
• Biscembranoids and glaucumolides are classes of compounds with potential biological activities.

Purpose of the Study:

• To isolate and characterize new biscembranoids from Sarcophyton trocheliophorum.
• To elucidate the structures and absolute configurations of these compounds using advanced spectroscopic and computational methods.
• To evaluate the immunomodulatory potential of the isolated compounds.

Main Methods:

• Isolation and purification of compounds using chromatographic techniques.
• Structure elucidation via spectroscopic methods (NMR, MS) and X-ray crystal diffraction.
• Determination of absolute configurations using DFT/NMR and TDDFT/ECD calculations.
• In vitro immunomodulatory assays assessing T cell proliferation and CD4+/CD8+ ratios.

Main Results:

• Five new biscembranoids, bistrochelides A-E, were identified alongside glaucumolides A and B.
• Structures and absolute configurations were confirmed, leading to the revision of glaucumolides A and B structures.
• Compounds 1 and 4 significantly induced CD3+ T cell proliferation.
• Compounds 1 and 5 significantly increased the CD4+/CD8+ ratio.

Conclusions:

• The study successfully isolated and characterized novel biscembranoids, expanding the known chemical diversity of soft coral metabolites.
• A new computational approach was developed for determining relative stereochemistry, improving accuracy.
• The isolated compounds exhibit significant immunomodulatory activities, particularly affecting T cell responses, suggesting potential therapeutic applications.