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https://www.selleckchem.com/products/Decitabine.html Fluorescently labeled dibenzodiazepinone-type muscarinic acetylcholine receptor (MR) antagonists, including dimeric ligands, were prepared using red-emitting cyanine dyes. Probes containing a fluorophore with negative charge showed high M2R affinities (pKi (radioligand competition binding) 9.10-9.59). Binding studies at M1 and M3-M5 receptors indicated a M2R preference. Flow cytometric and high-content imaging saturation and competition binding (M1R, M2R, and M4R) confirmed occupation of the orthosteric site. Confocal microscopy revealed that fluorescence was located mainly at the cell membrane (CHO-hM2R cells). Results from dissociation and saturation binding experiments (M2R) in the presence of allosteric M2R modulators (dissociation W84, LY2119620, and alcuronium; saturation binding W84) were consistent with a competitive mode of action between the fluorescent probes and the allosteric ligands. Taken together, these lines of evidence indicate that these ligands are useful fluorescent molecular tools to label the M2R in imaging and binding studies and suggest that they have a dualsteric mode of action.Collisional intermolecular interactions between excited states form short-lived dimers and complexes that lead to the emergence of excimer/exciplex emission of lower energy, a phenomenon which must be differentiated from the photoluminescence (PL) arising from the monomeric molecules. Although the utilization of noncovalent bonding interactions, leading to the generation of excimer/exciplex PL, has been investigated extensively, precise control of the aggregates and their persistence at very low concentrations remains a rare phenomenon. In the search for a fresh approach, we sought to obtain exciplex PL from permanent structures by incorporating anthracene moieties into pyridinium-containing mechanically interlocked molecules. Beyond the optical properties of the anthracene moieties, their π-extended nature enforce

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