title: S17834, a new inhibitor of cell adhesion and atherosclerosis that targets nadph oxidase.
abstract: microdant stress is involved in the events that accompany endothelial cell expression of adhesion molecules and leukocyte adherence in many disease states, including atherosclerosis. A recently discovered benzo(b)pyran-4-one derivative, S17834 (10 to 50 micromol/L), reduced tumor necrosis factor-stimulated vascular cell adhesion molecule-1 (VCAM) mRNA accumulation and protein expression in human umbilical vein endothelial cells. Intercellular cell adhesion molecule-1 and E-selectin were also inhibited by S17834, but platelet endothelial cell adhesion molecule-1 was not. Adherence of U937 monocytic cells to the endothelial cells as well as to plastic plates coated with soluble VCAM, intercellular cell adhesion molecule-1, P-selectin, and E-selectin was also decreased. Consistent with an antioxidant mechanism of action, S17834 (10 to 50 micromol/L) inhibited tumor necrosis factor-stimulated release of superoxide from endothelial cells measured by cytochrome c reduction. S17834 had no effect on superoxide produced by xanthine oxidase, indicating that rather than by acting as a scavenger of superoxide anion, the drug acts by inhibiting the production of free radicals. Indeed, S17834 inhibited NADPH oxidase activity of endothelial cell membranes. The ability to inhibit superoxide anion production appears to be key in the effect of S17834 on superoxide anion production and VCAM expression, because these actions were mimicked by adenovirus-mediated overexpression of superoxide dismutase. Furthermore, these actions may be relevant in vivo, because S17834 reduced aortic superoxide anion levels by 40% and aortic atherosclerotic lesions by 60% in apolipoprotein E-deficient mice. These results indicate that S17834 inhibits adhesion molecule expression and adherence of leukocytes to endothelial cells as well as aortic atherogenesis and that perhaps these effects can be explained by its ability to inhibit endogenous superoxide anion production.
authors.affiliation: Vascular Biology Unit, Boston University Medical Center, Boston, Massachusetts, USA.
authors.forename: A J
authors.initials: AJ
authors.lastname: Cayatte
authors.forename: A
authors.initials: A
authors.lastname: Rupin
authors.forename: J
authors.initials: J
authors.lastname: Oliver-Krasinski
authors.forename: K
authors.initials: K
authors.lastname: Maitland
authors.forename: P
authors.initials: P
authors.lastname: Sansilvestri-Morel
authors.forename: M F
authors.initials: MF
authors.lastname: Boussard
authors.forename: M
authors.initials: M
authors.lastname: Wierzbicki
authors.forename: T J
authors.initials: TJ
authors.lastname: Verbeuren
authors.forename: R A
authors.initials: RA
authors.lastname: Cohen
mesh_terms: D000818:Animals; D001018:Aortic Diseases / Q000188:drug therapy / Q000378:metabolism / Q000473:pathology; D001057:Apolipoproteins E / Q000235:genetics; D001161:Arteriosclerosis / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D001578:Benzopyrans / Q000494:pharmacology; D002374:Catalase / Q000235:genetics / Q000502:physiology; D002448:Cell Adhesion / Q000187:drug effects*; D015815:Cell Adhesion Molecules / Q000096:biosynthesis / Q000235:genetics; D002478:Cells, Cultured; D004730:Endothelium, Vascular / Q000187:drug effects / Q000276:immunology / Q000378:metabolism*; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D006801:Humans; D007962:Leukocytes / Q000276:immunology; D051379:Mice; D018345:Mice, Knockout; D019255:NADPH Oxidases / Q000037:antagonists & inhibitors*; D012333:RNA, Messenger / Q000096:biosynthesis; D013482:Superoxide Dismutase / Q000235:genetics / Q000502:physiology; D013481:Superoxides / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology; D020298:U937 Cells
chemical_list: C438505:6,8-diallyl 5,7-dihydroxy 2-(2-allyl 3-hydroxy 4-methoxyphenyl)1-H benzo(b)pyran-4-one; D001057:Apolipoproteins E; D001578:Benzopyrans; D015815:Cell Adhesion Molecules; D004791:Enzyme Inhibitors; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D013481:Superoxides; D002374:Catalase; D013482:Superoxide Dismutase; D019255:NADPH Oxidases