(±)-WIN 55,212-2 is a potent aminoalkylindole cannabinoid (CB) receptor agonist with a Ki value of 62.3 and 3.3 nM for human recombinant central cannabinoid (CB1) and peripheral cannabinoid (CB2) receptors, respectively. In contrast, the enantiomer (-)-WIN 55,212-3 acts a partial inverse agonist at CB1 (pIC50 = 5.5) and as a competitive neutral antagonist of CB2, reversing the inverse agonism evoked by SR 144528 (pEC50 = 5.3). (+)-WIN 55,212 (mesylate) is a mixture of the two enantiomers, (+)-WIN 55,212-2 and (-)-WIN 55,212-3.
WIN 66306 is a cyclic heptapeptide antagonist of neurokinin-1 (NK1) and NK2 receptors originally isolated from A. flavipes. It binds to NK1 and NK2 receptors and inhibits contractions induced by substance P in isolated guinea pig ileum in a concentration-dependent manner.
Disoxaril (BRN 3626820, WIN 51711) is an anti-picornavirus agent that inhibits enterovirus replication by binding to a hydrophobic bag within the VP1 coat protein, thereby stabilizing virions and preventing their uncoating. When used in combination with A
Cyclindole is an antipsychotic with a tricyclic structure that was never marketed. It displaces spiperone binding in vitro and elevates dopamine levels in the striatum, indicating it acts as a D₂ receptor antagonist.
Scytonemin is a biological pigment synthesized by many strains of cyanobacteria, including Calothrix sp., Lyngbya aestuarii, and others. Scytonemin is also a potent PKL1 inhibitor, which inhibits cell proliferation and arrests cell cycle through downregulating Plk1 activity in many cancel cells. Scytonemin was able to inhibit the proliferation of three myeloma cells in a dose-dependent manner, while U266 was the most sensitive one to scytonemin. Scytonemin , representing a novel Plk1 inhibitor, induced the inhibition of cell growth and cell cycle arrest in multiple myeloma cells by specifically decreasing Plk1 activity.