title: Evaluation of original dual thromboxane A2 modulators as antiangiogenic agents.
abstract: Angiogenesis is a promising target for the therapy of several diseases including cancer. This study was undertaken to characterize the antiangiogenic properties of a series of original dual thromboxane A(2) (TXA(2)) inhibitors derived from torasemide, a marketed loop diuretic with TXA(2) antagonistic properties, by evaluating their effects on human endothelial cell migration, adhesion, and viability in vitro, as well as in the ex vivo rat aortic ring assay. All drugs tested exhibited a marked affinity toward human platelet TXA(2) receptor, significantly prevented platelet aggregation induced by U-46,619, a stable TXA(2) receptor agonist, and inhibited platelet TXA(2) synthase without affecting cyclooxygenase (COX)-1 or COX-2 enzymatic activities. These dual TXA(2) inhibitors dose dependently inhibited endothelial cell migration in chemotaxis assays using vascular endothelial growth factor (VEGF) as a chemoattractant but failed to affect cell adhesion and viability. The highest rates of cell migration inhibition were obtained with original compounds BM-567 and BM-573 (50.3 and 59.4% inhibition, respectively) when used at the final concentration of 10 microM. In addition, pretreatment of endothelial cells with these two drugs significantly prevented U-46,619-induced intracellular Ca(2+) pool mobilization, thus suggesting a mechanistic link between inhibition of the TXA(2) pathway and reduced endothelial cell migration. Treatment of rat aortic explants with U-46,619 (9,11-dideoxy-9,11-methanoepoxy-prostaglandin F(2)) significantly enhanced vessel sprouting whereas aortic rings treated with some of the compounds, including BM-567 (N-n-pentyl-N'-[2-(cyclohexylamino)-5-nitrobenzenesulfonyl]urea) and BM-573 (N-tert-butyl-N'-[5-nitro-2-p-toluylaminobenzenesulfonyl]urea), showed a significant decrease in vessel sprouting, which was not reversed by the addition of VEGF. These data suggest that our original dual TXA(2) inhibitors bear antiangiogenic properties, mainly by inhibiting endothelial cell migration.
authors.affiliation: Natural and Synthetic Drugs Research Center, Laboratory of Medicinal Chemistry, University of Liège, B-4000 Liège, Belgium. xdeleval@ulg.ac.be
authors.forename: Xavier
authors.initials: X
authors.lastname: de Leval
authors.forename: Thibaut
authors.initials: T
authors.lastname: Dassesse
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Dogné
authors.forename: David
authors.initials: D
authors.lastname: Waltregny
authors.forename: Akeila
authors.initials: A
authors.lastname: Bellahcène
authors.forename: Valérie
authors.initials: V
authors.lastname: Benoit
authors.forename: Bernard
authors.initials: B
authors.lastname: Pirotte
authors.forename: Vincent
authors.initials: V
authors.lastname: Castronovo
mesh_terms: D020533:Angiogenesis Inhibitors / Q000494:pharmacology*; D000818:Animals; D019086:Bridged Bicyclo Compounds, Heterocyclic; D002118:Calcium / Q000378:metabolism; D002448:Cell Adhesion / Q000187:drug effects; D002465:Cell Movement / Q000187:drug effects; D002478:Cells, Cultured; D016861:Cyclooxygenase Inhibitors / Q000494:pharmacology; D042783:Endothelial Cells / Q000187:drug effects / Q000502:physiology; D005231:Fatty Acids, Unsaturated; D006801:Humans; D006834:Hydrazines / Q000378:metabolism; D008297:Male; D010974:Platelet Aggregation / Q000187:drug effects; D051381:Rats; D017208:Rats, Wistar; D044244:Receptors, Thromboxane A2, Prostaglandin H2 / Q000037:antagonists & inhibitors*; D013449:Sulfonamides / Q000494:pharmacology; D013928:Thromboxane A2 / Q000037:antagonists & inhibitors*; D013930:Thromboxane-A Synthase / Q000037:antagonists & inhibitors*; D000077786:Torsemide
chemical_list: D020533:Angiogenesis Inhibitors; D019086:Bridged Bicyclo Compounds, Heterocyclic; D016861:Cyclooxygenase Inhibitors; D005231:Fatty Acids, Unsaturated; D006834:Hydrazines; D044244:Receptors, Thromboxane A2, Prostaglandin H2; D013449:Sulfonamides; D013928:Thromboxane A2; C045749:SQ 29548; D013930:Thromboxane-A Synthase; D002118:Calcium; D000077786:Torsemide