Article (Scientific journals)
Synthesis and biological effects of NO in malignant glioma cells: modulation by cytokines including CD95L and TGF-beta, dexamethasone, and p53 gene transfer.
Rieger, Johannes; Ständer, Marko; Löschmann, Peter A. et al.
1998In Oncogene, 17 (18), p. 2323 - 2332
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Keywords :
Antineoplastic Agents, Hormonal; Cytokines; Interleukin-1; Lipopolysaccharides; Neoplasm Proteins; Protein Synthesis Inhibitors; Transforming Growth Factor alpha; Transforming Growth Factor beta; Tumor Suppressor Protein p53; fas Receptor; Nitric Oxide; Dexamethasone; Cycloheximide; NOS2 protein, human; Nitric Oxide Synthase; Nitric Oxide Synthase Type II; Nos2 protein, rat; Animals; Antineoplastic Agents, Hormonal/pharmacology; Cycloheximide/pharmacology; Cytokines/pharmacology; Dexamethasone/pharmacology; Genes, p53/genetics; Genes, p53/physiology; Glioma/genetics; Glioma/metabolism; Glioma/pathology; Humans; Interleukin-1/pharmacology; Lipopolysaccharides/pharmacology; Neoplasm Proteins/biosynthesis; Nitric Oxide/biosynthesis; Nitric Oxide/pharmacology; Nitric Oxide Synthase/antagonists & inhibitors; Nitric Oxide Synthase/biosynthesis; Protein Synthesis Inhibitors/pharmacology; Rats; Transforming Growth Factor alpha/pharmacology; Transforming Growth Factor beta/pharmacology; Tumor Cells, Cultured; Tumor Suppressor Protein p53/metabolism; fas Receptor/physiology; Apoptosis; CD95 ligand; Glioma; p53; Molecular Biology; Genetics; Cancer Research; CD 95 ligand
Abstract :
[en] Nitric oxide (NO) is thought to play an important role in neurotransmission, inflammation, and regulation of cell death in the mammalian brain. Here, we examined the synthesis and biological effects of NO in human malignant glioma cells. Exposure to cytokines such as interferon (IFN)-gamma, tumor necrosis factor (TNF)-alpha or interleukin (IL)-1beta and lipopolysaccharide (LPS) induced NO synthesis in rat C6 and A172 human glioma cells, but not in LN-229, T98G or LN-18 human malignant glioma cells. Induced release of NO involved enhanced expression of inducible NO synthase (iNOS). Failure to detect NO release in the latter cell lines was not overcome by neutralization of endogenous TGF-beta or by coexposure to cytokines, LPS, and antioxidants. Apoptosis induced by CD95 ligand (CD95L) did not involve NO formation. Neither NOS inhibitors nor NO donators modulated CD95L-induced apoptosis. Dexamethasone (DEX)-mediated protection of glioma cells from CD95L-induced apoptosis was also independent of DEX effects on NO metabolism. DEX inhibited not only cytokine/LPS-evoked NO release but also attenuated the toxicity of NO in three of five cell lines. Forced expression of temperature-sensitive p53 val135 in C6 cells in either mutant or wild-type conformation inhibited cytokine/LPS-induced NO synthesis. Further, accumulation of p53 in both mutant or wild-type conformation protected glioma cells from the toxicity of exogenous NO, consistent with a gain of p53 function associated with p53 accumulation. We conclude that resistance to NO-dependent immune defense mechanisms may contribute to the malignant progression of human cancers with p53 alterations, notably those associated with the accumulation of mutant p53 protein.
Disciplines :
Oncology
Author, co-author :
Rieger, Johannes;  Department of Neurology, University of Tübingen, School of Medicine, Germany
Ständer, Marko;  Lab. of Molecular Neuro-Oncology, University of Tübingen, School of Medicine, Tübingen, Germany
Löschmann, Peter A.;  Laboratory of Neuropharmacology, University of Tübingen, School of Medicine, Tübingen, Germany
HENEKA, Michael  ;  Laboratory of Neuropharmacology, University of Tübingen, School of Medicine, Tübingen, Germany
Dichgans, Johannes;  Laboratory of Neuropharmacology, University of Tübingen, School of Medicine, Tübingen, Germany
Klockgether, Thomas;  Laboratory of Neuropharmacology, University of Tübingen, School of Medicine, Tübingen, Germany
Weller, Michael;  Lab. of Molecular Neuro-Oncology, University of Tübingen, School of Medicine, Tübingen, Germany
External co-authors :
yes
Language :
English
Title :
Synthesis and biological effects of NO in malignant glioma cells: modulation by cytokines including CD95L and TGF-beta, dexamethasone, and p53 gene transfer.
Publication date :
05 November 1998
Journal title :
Oncogene
ISSN :
0950-9232
eISSN :
1476-5594
Publisher :
Nature Publishing Group, England
Volume :
17
Issue :
18
Pages :
2323 - 2332
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
Supported by the German Research Foundation (We 1502/ 5-1).
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