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Synthesis and Functional Characterization of Substituted Isoquinolinones as MT2-Selective Melatoninergic Ligands
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Synthesis and Functional Characterization of Substituted Isoquinolinones as MT2-Selective Melatoninergic Ligands
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Journal Article
Synthesis and Functional Characterization of Substituted Isoquinolinones as MT2-Selective Melatoninergic Ligands
2014
Overview
A series of substituted isoquinolinones were synthesized and their binding affinities and functional activities towards human melatonin MT1 and MT2 receptors were evaluated. Structure-activity relationship analysis revealed that substituted isoquinolinones bearing a 3-methoxybenzyloxyl group at C5, C6 or C7 position respectively (C5>C6>C7 in terms of their potency) conferred effective binding and selectivity toward the MT2 receptor, with 15b as the most potent compound. Most of the tested compounds were MT2-selective agonists as revealed in receptor-mediated cAMP inhibition, intracellular Ca2+ mobilization and phosphorylation of extracellular signal-regulated protein kinases. Intriguingly, compounds 7e and 7f bearing a 4-methoxybenzyloxyl group or 4-methylbenzyloxyl at C6 behaved as weak MT2-selective antagonists. These results suggest that substituted isoquinolinones represent a novel family of MT2-selective melatonin ligands. The position of the substituted benzyloxyl group, and the substituents on the benzyl ring appeared to dictate the functional characteristics of these compounds.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Animals
/ Binding
/ Humans
/ Isoquinolines - chemical synthesis
/ Kinases
/ Ligands
/ Proteins
/ Receptor, Melatonin, MT1 - antagonists & inhibitors
/ Receptor, Melatonin, MT1 - chemistry
/ Receptor, Melatonin, MT1 - metabolism
/ Receptor, Melatonin, MT2 - antagonists & inhibitors
/ Receptor, Melatonin, MT2 - chemistry
/ Receptor, Melatonin, MT2 - metabolism
/ Research and Analysis Methods
