title: Vitamin E attenuates induction of elastase-like activity by tumor necrosis factor-alpha, cholestan-3 beta,5 alpha,6 beta-triol and linoleic acid in cultured endothelial cells.
abstract: Disturbances in arterial wall elastin metabolism appear to be important factors in atherosclerosis development. To evaluate this hypothesis, elastase-like activity was determined in cultured endothelial cells and their surrounding media after exposure to tumor necrosis factor-alpha (TNF), cholestan-3 beta,5 alpha,6 beta-triol (Triol) and linoleic acid (18:2). Significant increases in elastase-like activity both in the cells and in the media were observed when subconfluent endothelial cells were treated with 12 microM Triol, 500 U TNF/ml, or 90 microM 18:2, for 72 h in the presence of 5% calf serum. Even higher activities were measured when endothelial cells were seeded directly into media enriched with 18:2, TNF or Triol and treated for 72 h. Vitamin E supplementation (25 microM) attenuated elastase-like activity in cells and media, independent of treatment. These results suggest that elastase-like enzyme induction in endothelial cells may be involved in cellular perturbations induced by certain lipids and cytokines. Vitamin E may provide a protective function by preventing the induction of elastolytic enzymes. This may have implications in elastin metabolism and atherosclerosis.
authors.affiliation: Department of Nutrition and Food Science, University of Kentucky, Lexington 40506-0054.
authors.forename: M
authors.initials: M
authors.lastname: Toborek
authors.forename: B
authors.initials: B
authors.lastname: Hennig
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D002777:Cholestanols / Q000494:pharmacology*; D003470:Culture Media; D004730:Endothelium, Vascular / Q000187:drug effects / Q000201:enzymology*; D004790:Enzyme Induction / Q000187:drug effects; D000960:Hypolipidemic Agents / Q000494:pharmacology; D019787:Linoleic Acid; D008041:Linoleic Acids / Q000494:pharmacology*; D010196:Pancreatic Elastase / Q000096:biosynthesis*; D013552:Swine; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*; D014810:Vitamin E / Q000494:pharmacology*
chemical_list: D002777:Cholestanols; D003470:Culture Media; D000960:Hypolipidemic Agents; D008041:Linoleic Acids; D014409:Tumor Necrosis Factor-alpha; C000474:cholestane-3,5,6-triol; D014810:Vitamin E; D019787:Linoleic Acid; D010196:Pancreatic Elastase