title: Exposure of human lung fibroblasts to ozone: cell mortality and hyaluronan metabolism.
abstract: Exposure of cultures of human lung fibroblasts to 0.5 ppm ozone for 20 h resulted in a significant increase in cellular mortality by 29%; after exposure to 2.5 ppm ozone for 4 h, the increase amounted to 74%. A marked difference in sensitivity to ozone was observed between fibroblast lines from different individuals. This variability in resistance to ozone was more evident after exposure to 0.5 ppm ozone for 20 h, when compared with 2.5 ppm ozone for 4 h. In one fibroblast line, synthesis of hyaluronan was enhanced by exposure to 0.5 ppm ozone for 20 h. The concentrations of hyaluronan in culture media increased in experiments using different fibroblast cell lines, a phenomenon that was obvious both if cell numbers and combined protein concentrations of cells and media are selected as references for hyaluronan concentrations.
authors.affiliation: Thoraxklinik Heidelberg-Rohrbach, Heidelberg, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Mayer
authors.forename: D
authors.initials: D
authors.lastname: Branscheid
mesh_terms: D016923:Cell Death / Q000187:drug effects; D002460:Cell Line; D002478:Cells, Cultured; D003470:Culture Media; D005347:Fibroblasts / Q000737:chemistry / Q000187:drug effects* / Q000648:ultrastructure; D006801:Humans; D006820:Hyaluronic Acid / Q000032:analysis / Q000378:metabolism*; D008168:Lung / Q000166:cytology / Q000187:drug effects*; D008854:Microscopy, Electron; D010126:Ozone / Q000633:toxicity*; D011506:Proteins / Q000032:analysis
chemical_list: D003470:Culture Media; D011506:Proteins; D010126:Ozone; D006820:Hyaluronic Acid