Cannabinomimetic lipid from a marine cyanobacterium

Area of Science:

• Marine Natural Products Chemistry
• Pharmacology
• Chemical Biology

Background:

• Marine cyanobacteria, such as Lyngbya majuscula and Oscillatoria sp., are prolific sources of structurally diverse bioactive secondary metabolites.
• Natural products with cannabinoid receptor activity are of significant interest for therapeutic development.

Purpose of the Study:

• To isolate and characterize novel chemical entities from marine cyanobacteria.
• To evaluate the isolated compounds for activity at cannabinoid receptors.

Main Methods:

• Guided isolation using Nuclear Magnetic Resonance (NMR) spectroscopy.
• Structure elucidation employing NMR and Mass Spectrometry (MS) data.
• Pharmacological evaluation of receptor binding affinity and selectivity.

Main Results:

• Two new lipids, serinolamide A (3) and propenediester (4), were successfully isolated from Lyngbya majuscula and Oscillatoria sp.
• The structures of serinolamide A and propenediester were fully determined using comprehensive spectroscopic analysis.
• Serinolamide A demonstrated moderate agonist activity and selectivity for the CB1 cannabinoid receptor (Ki=1.3 microM, >5-fold).

Conclusions:

• Serinolamide A is a novel marine-derived natural product with cannabinomimetic properties.
• This discovery expands the known repertoire of marine natural products targeting the endocannabinoid system.
• The findings highlight the potential of marine cyanobacteria as a source for new pharmacologically active compounds.