2. Academic Validation
  3. Identification of a Potent and Selective Cannabinoid CB1 Receptor Antagonist from Auxarthron reticulatum

Identification of a Potent and Selective Cannabinoid CB1 Receptor Antagonist from Auxarthron reticulatum

  • ACS Med Chem Lett. 2011 Sep 17;2(11):866-9. doi: 10.1021/ml200183z.
Mahmoud Fahmi Elsebai 1,  Viktor Rempel 2,  Gregor Schnakenburg 3,  Stefan Kehraus 4,  Christa E Müller 2,  Gabriele M König 4
Affiliations

Affiliations

  • 1 Institute for Pharmaceutical Biology, University of Bonn , 53115 Bonn, Germany ; Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University , Egypt.
  • 2 Pharma Center Bonn, Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn , 53121 Bonn, Germany.
  • 3 Institute of Inorganic Chemistry, Department of X-ray Crystallography, University of Bonn , 53121 Bonn, Germany.
  • 4 Institute for Pharmaceutical Biology, University of Bonn , 53115 Bonn, Germany.
PMID: 24900275 DOI: 10.1021/ml200183z
Abstract

The fungus Auxarthron reticulatum derived from the marine Sponge Ircinia variabilis produced the diketopiperazine alkaloid amauromine (1) and the quinolinone methyl-penicinoline (2). Compound 2 is identical to the reported methyl-marinamide, whose structure is herewith revised. In radioligand binding studies at human cannabinoid CB1 and CB2 receptors recombinantly expressed in Chinese hamster ovary (CHO) cells, amauromine (1) was found to exhibit high affinity and selectivity for the CB1 receptor (K i = 178 nM). The compound was shown to be a neutral CB1 Antagonist with a K b value of 66.6 nM determined in cAMP assays. Compound 2 exhibited only weak or no effects at CB receptors. To the best of our knowledge, compound 1 is the first Fungal natural product that shows affinity for cannabinoid CB1 receptors. Because of its high antagonistic potency and selectivity, it may have potential for use as a drug and/or serve as a lead structure for drug development.

Keywords

Auxarthron reticulatum; CB1; CB2; amauromine; cannabinoid receptors; natural products.

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