title: Identification of a Potent and Selective Cannabinoid CB1 Receptor Antagonist from Auxarthron reticulatum.
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.
authors.affiliation: Institute for Pharmaceutical Biology, University of Bonn , 53115 Bonn, Germany ; Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University , Egypt.
authors.forename: Mahmoud Fahmi
authors.initials: MF
authors.lastname: Elsebai
authors.affiliation: Pharma Center Bonn, Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn , 53121 Bonn, Germany.
authors.forename: Viktor
authors.initials: V
authors.lastname: Rempel
authors.affiliation: Institute of Inorganic Chemistry, Department of X-ray Crystallography, University of Bonn , 53121 Bonn, Germany.
authors.forename: Gregor
authors.initials: G
authors.lastname: Schnakenburg
authors.affiliation: Institute for Pharmaceutical Biology, University of Bonn , 53115 Bonn, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Kehraus
authors.affiliation: Pharma Center Bonn, Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn , 53121 Bonn, Germany.
authors.forename: Christa E
authors.initials: CE
authors.lastname: Müller
authors.affiliation: Institute for Pharmaceutical Biology, University of Bonn , 53115 Bonn, Germany.
authors.forename: Gabriele M
authors.initials: GM
authors.lastname: König
keywords: Auxarthron reticulatum; CB1; CB2; amauromine; cannabinoid receptors; natural products