Reactive oxygen species influence nerve growth factor synthesis in primary rat astrocytes

Newborn rat brain astrocytes, cultured in a serum-free medium, were exposed for 30 min to two types of reactive oxygen species. Cells were either treated with the xanthine/xanthine oxidase (X/XOD) system, which generates both H2O2 and the O2.- radical, or to H2O2 alone. Both treatments induced a dos...

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Published inJournal of neurochemistry Vol. 62; no. 6; p. 2178
Main Authors Naveilhan, P, Neveu, I, Jehan, F, Baudet, C, Wion, D, Brachet, P
Format Journal Article
LanguageEnglish
Published England 01.06.1994
Subjects
Animals
Anisomycin - pharmacology
Astrocytes - metabolism
Catalase - pharmacology
Cells, Cultured
Hydrogen Peroxide - pharmacology
Nerve Growth Factors - biosynthesis
Rats
Reactive Oxygen Species - pharmacology
Xanthine
Xanthine Oxidase - pharmacology
Xanthines - pharmacology
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Summary:Newborn rat brain astrocytes, cultured in a serum-free medium, were exposed for 30 min to two types of reactive oxygen species. Cells were either treated with the xanthine/xanthine oxidase (X/XOD) system, which generates both H2O2 and the O2.- radical, or to H2O2 alone. Both treatments induced a dose-dependent accumulation of nerve growth factor (NGF) transcripts, 6 h after the exposure. Maximal effect was obtained with 6 mU/ml XOD, or 10(-4) M H2O2. A rapid expression of protooncogenes of the jun and fos families was also noticed in X/XOD- or H2O2-treated cells. This phenomenon was transient in cells exposed to X/XOD. However, in the case of H2O2-treated cells, the accumulation of c-fos or c-jun mRNAs was still pronounced 6 h after the end of the treatment and the levels of cell-secreted NGF appeared relatively reduced, when compared with those obtained after a shock with the X/XOD system. This raised the possibility that H2O2 at 10(-4) M could depress protein synthesis. Measurements of the incorporation of radiolabeled amino acids into trichloroacetic acid-precipitable material supported this assumption. Level of radioactivity associated with cellular material was dramatically reduced in H2O2-treated cells, when it was compared with control or X/XOD-treated cells. Furthermore, treatment of cells with the protein synthesis inhibitor anisomycin had an effect similar to that of H2O2 because it caused an accumulation of c-fos, c-jun, and NGF transcripts after 6 h of treatment.
ISSN:0022-3042
DOI:10.1046/j.1471-4159.1994.62062178.x