Additional scalarane sesterterpenes from the sponge Phyllospongia papyracea

Area of Science:

• Marine natural products chemistry
• Organic chemistry
• Pharmacology

Background:

• Marine sponges are a rich source of diverse chemical compounds.
• Phyllospongia papyracea is a marine sponge species with potential for novel metabolite discovery.
• Beta-catenin/Tcf4 signaling pathway is crucial in various cellular processes, including cancer.

Purpose of the Study:

• To isolate and characterize new sesterterpenes from the marine sponge Phyllospongia papyracea.
• To evaluate the biological activity of isolated compounds against the beta-catenin/Tcf4 complex.

Main Methods:

• Chemical investigation of Phyllospongia papyracea using spectroscopic techniques (1D and 2D NMR, Mass Spectrometry).
• Bioactivity screening using a beta-catenin/Tcf4 disruption assay.

Main Results:

• Six new bishomoscalarane sesterterpenes and one known scalarane sesterterpene were isolated.
• Two of the new compounds feature rare cyclobutane rings within their scalarane structure.
• None of the isolated compounds demonstrated inhibitory activity against the beta-catenin and Tcf4 complex.

Conclusions:

• Phyllospongia papyracea yielded novel sesterterpene structures, expanding the known chemical diversity of this sponge class.
• The identified sesterterpenes do not appear to modulate the beta-catenin/Tcf4 pathway.
• Further investigation into the biological activities of these compounds may be warranted.