title: The ozone tolerance: I) Enhancement of antioxidant enzymes is ozone dose-dependent in Jurkat cells.
abstract: We have begun to examine the biological and toxic effects of ozone on Jurkat T cells incubated thereafter for 24, 48 and 72 h. Tissue culture medium was strengthened by adding 20% fetal calf serum with an albumin content of about 6 mg/ml. Ozonization was performed by exposing for 10 min a volume of cell suspension (4 x 10(5)/ml) to an equal volume of a gas mixture composed of oxygen-ozone with precise ozone concentrations ranging from 1.5 up to 72 microg/ml (31.5-1512 microM). The proliferation index declined progressively and was ozone dose-dependent. The response of enzymatic activities varied depending upon the enzyme and ozone concentrations: glucose-6-phosphate dehydrogenase begins to increase at an ozone dose of 6 microg/ml (126 microM), reached a peak at 12 microg/ml (252 microM) and rapidly declined thereafter. On the other hand activities of superoxide dismutase, glutathione peroxidase and glutathione reductase increased progressively from the ozone concentration of 12 microg/ml. Thus, as we have observed in blood, the biological response is linked to the ozone dose that must reach a threshold to be effective.
authors.affiliation: Department of Physiology, University of Siena, Via A. Moro, 53100 Siena, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Larini
authors.forename: L
authors.initials: L
authors.lastname: Bianchi
authors.forename: V
authors.initials: V
authors.lastname: Bocci
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D005954:Glucosephosphate Dehydrogenase / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D005980:Glutathione Reductase / Q000378:metabolism; D006801:Humans; D019169:Jurkat Cells; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010126:Ozone / Q000633:toxicity*; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D000975:Antioxidants; D010126:Ozone; D005954:Glucosephosphate Dehydrogenase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D005980:Glutathione Reductase; D010100:Oxygen