Endothelin-1 (ET-1), a potent vasoconstrictor peptide, exerts its physiological effects by binding and activating specific G protein-coupled receptors, named ET(A) and ET(B). An unique property of ET-1 is its ability to bind almost irreversibly to its receptors. Aspirin and salicylic acid (SA) are allosteric inhibitors of ET-1 binding to ET(A) receptors. Dihalogenated derivatives of SA have been identified as more potent allosteric inhibitors than aspirin. In this study, disubstituted benzohydroxamic acid, benzaldoximes and dihalosalicylic acid dimers were synthesized and tested as inhibitors of [(125)I] ET-1 binding to ET(A) receptors in rat embryonic cardiomyocyte (H9c2 cell) membranes. Some dihalosalicylic acid dimers 2h showed good inhibitory activity, the most active compounds are the hydroxamic acids derived from anthranilic acid. Among these compounds, the 3,5-diiodo-2-aminobenzohydroxamic acid e compound 2a is three-folds more potent as inhibitor of [(125)I] ET-1 binding to ET(A) receptors than the 3; 5-diiodosalicylic acid reported in literature. Most aryl aldoximes in this study were biologically inactive as inhibitors of [(125)I] ET-1 binding to ET(A) receptors.

Allosteric inhibition of (125I) ET-1 binding to ET(A) receptors by aldoxime and hydroxamic acid derivatives

NENCETTI, SUSANNA;MAZZONI, MARIA ROSA;LAPUCCI, ANNALINA
2008

Abstract

Endothelin-1 (ET-1), a potent vasoconstrictor peptide, exerts its physiological effects by binding and activating specific G protein-coupled receptors, named ET(A) and ET(B). An unique property of ET-1 is its ability to bind almost irreversibly to its receptors. Aspirin and salicylic acid (SA) are allosteric inhibitors of ET-1 binding to ET(A) receptors. Dihalogenated derivatives of SA have been identified as more potent allosteric inhibitors than aspirin. In this study, disubstituted benzohydroxamic acid, benzaldoximes and dihalosalicylic acid dimers were synthesized and tested as inhibitors of [(125)I] ET-1 binding to ET(A) receptors in rat embryonic cardiomyocyte (H9c2 cell) membranes. Some dihalosalicylic acid dimers 2h showed good inhibitory activity, the most active compounds are the hydroxamic acids derived from anthranilic acid. Among these compounds, the 3,5-diiodo-2-aminobenzohydroxamic acid e compound 2a is three-folds more potent as inhibitor of [(125)I] ET-1 binding to ET(A) receptors than the 3; 5-diiodosalicylic acid reported in literature. Most aryl aldoximes in this study were biologically inactive as inhibitors of [(125)I] ET-1 binding to ET(A) receptors.
Ahmed, M; Nencetti, Susanna; Mazzoni, MARIA ROSA; Porchia, F; Antonelli, F; Lapucci, Annalina
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/200648
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