Modulation of arachidonic acid turnover in macrophages by cadmium.
The effects of cadmium (Cd) induced redox changes on arachidonic acid (AA) turnover in mouse resident peritoneal macrophages (pM) were studied. The pre-incubation of pM in a medium containing glutathione (GSH, 0.1 or 1 mM) for 6 h protects pM from loss of viability and AA uptake diminution induced by Cd with regard to non pre-incubated cultures. The exposure of macrophages to Cd 10 microM decreases AA uptake within 2 h and increases AA release in relation to non-exposed macrophages. It also enhances AA mobilization and reactive oxygen species (ROS) release induced by okadaic acid and opsonized zimosan and decreases those induced by lipopolysaccharide, but does not modify either AA mobilization or ROS release induced by phorbol ester. These results might suggest that redox changes induced by Cd produce an important impact on AA turnover in macrophages; information that is relevant in the understanding of the cellular toxicity of this metal.
Ramirez
D C
DC
Department of Biochemistry and Biological Sciences, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, Avenida Ejercito de los Andes 950, 5700 San Luis, Argentina. dramirez@unsl.edu.ar
Riera
C M
CM
Gimenez
M S
MS
D000818:Animals; D001095:Arachidonic Acids / Q000378:metabolism*; D002104:Cadmium / Q000494:pharmacology*; D002470:Cell Survival / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D005978:Glutathione / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000494:pharmacology; D017737:Macrophages, Peritoneal / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D019319:Okadaic Acid / Q000494:pharmacology; D010084:Oxidation-Reduction / Q000187:drug effects; D017382:Reactive Oxygen Species / Q000378:metabolism; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D013997:Time Factors; D015054:Zymosan / Q000494:pharmacology
D001095:Arachidonic Acids; D008070:Lipopolysaccharides; D017382:Reactive Oxygen Species; D002104:Cadmium; D019319:Okadaic Acid; D015054:Zymosan; D005978:Glutathione; D013755:Tetradecanoylphorbol Acetate