Article: article from journal or magazin.
Inhibition of monoamine oxidase-B by condensed pyridazines and pyrimidines: effects of lipophilicity and structure-activity relationships.
Journal of Medicinal Chemistry
Publication types: In Vitro ; Journal Article
A number of condensed pyridazines and pyrimidines were synthesized and tested for their monoamine oxidase-A (MAO-A) and MAO-B inhibitory activity. Their lipophilicity was examined by measuring partition coefficients and RP-HPLC capacity factors, revealing some peculiar electronic and conformational effects. Further insights were obtained by X-ray crystallography and a thermodynamic study of RP-HPLC retention. Structure-activity relations highlighted the main factors determining both selectivity and inhibitory potency. Thus, while most of the condensed pyridazines were reversible inhibitors of MAO-B with little or no MAO-A effects, the pyrimidine derivatives proved to be reversible and selective MAO-A inhibitors. Substituents on the diazine nucleus modulated enzyme inhibition. A QSAR analysis of X-substituted 3-X-phenyl-5H-indeno[1,2-c]pyridazin-5-ones showed lipophilicity to increase MAO-B and not MAO-A inhibitory activity.
Animals, Brain/drug effects, Brain/enzymology, Crystallography, X-Ray, Linear Models, Mitochondria/drug effects, Mitochondria/enzymology, Models, Molecular, Molecular Conformation, Monoamine Oxidase Inhibitors/chemical synthesis, Monoamine Oxidase Inhibitors/chemistry, Pyridazines/chemical synthesis, Pyridazines/chemistry, Pyrimidines/chemical synthesis, Pyrimidines/chemistry, Rats, Structure-Activity Relationship
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