Bioactive guanidine alkaloids from two Caribbean marine sponges

Area of Science:

• Marine Natural Products Chemistry
• Medicinal Chemistry
• Pharmacology

Background:

• Marine sponges are a rich source of structurally diverse bioactive compounds.
• Guanidine alkaloids represent a class of natural products with significant pharmacological potential.
• Previous research has identified various alkaloids from Monanchora and Clathria species.

Purpose of the Study:

• To isolate and characterize novel guanidine alkaloids from Caribbean marine sponges.
• To evaluate the cytotoxic and antimalarial activities of the isolated alkaloids.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation via comprehensive spectroscopic analyses (1D and 2D NMR, Mass Spectrometry).
• In vitro bioassays against human cancer cell lines and Plasmodium falciparum (malaria protozoa).

Main Results:

• Seven new guanidine alkaloids, designated compounds 1-7, were successfully isolated and identified.
• Known alkaloids including batzelladines A, F, H, L, ptilomycalin A, and fromiamycalin were also obtained.
• Preliminary bioactivity screening indicated potential for cytotoxic and antimalarial effects.

Conclusions:

• The Caribbean marine sponges Monanchora arbuscula and Clathria calla are sources of novel guanidine alkaloids.
• The isolated alkaloids warrant further investigation for their therapeutic potential in cancer and malaria treatment.
• This study expands the known chemical diversity of marine-derived guanidine alkaloids.