Functional Cell-Based Screening and Saturation Transfer Double-Difference NMR Have Identified Haplosamate A as a Cannabinoid Receptor Agonist

A marine natural product extract library has been screened with a functional cell-based G-protein coupled receptor assay to find compounds capable of binding the human cannabinoid receptors CB1 and CB2. The methanol extract of the marine sponge Dasychalina fragilis collected in Papua New Guinea was...

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Bibliographic Details
Published in:ACS chemical biology 2009-02, Vol.4 (2), p.139-144
Main Authors: Pereira, Alban, Pfeifer, Tom A, Grigliatti, Thomas A, Andersen, Raymond J
Format: Article
Language:English
Subjects:
Animals
Binding, Competitive
Biological Assay
Cell Line, Transformed
Humans
Insecta
Magnetic Resonance Spectroscopy
Papua New Guinea
Porifera - chemistry
Receptor, Cannabinoid, CB1 - agonists
Receptor, Cannabinoid, CB2 - agonists
Sterols - chemistry
Sterols - isolation & purification
Tissue Extracts
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Summary:A marine natural product extract library has been screened with a functional cell-based G-protein coupled receptor assay to find compounds capable of binding the human cannabinoid receptors CB1 and CB2. The methanol extract of the marine sponge Dasychalina fragilis collected in Papua New Guinea was active in the assay. Bioassay-guided fractionation of the extract identified the phosphorylated sterol sulfate haplosamate A (1) as a cannabinoid receptor agonist. The high water solubility of haplosamate A (1) allowed exploration of its binding interactions with the human cannabinoid receptors in whole insect cells by means of saturation transfer double-difference NMR spectroscopy. This technique confirmed that haplosamate A (1) binds selectively to these receptors.
ISSN:1554-8929
1554-8937
DOI:10.1021/cb800264k