Title : Tumour necrosis factor induced an early release of superoxide and a late mitochondrial membrane depolarization in L929 cells. Increase in the production of superoxide is not sufficient to mimic the action of TNF.

Pub. Date : 2001 Sep-Oct

PMID : 11490098






12 Functional Relationships(s)
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1 One of the post-receptor events shortly after the addition of TNF is the generation of the superoxide anion (O2-*). Superoxides tumor necrosis factor Mus musculus
2 One of the post-receptor events shortly after the addition of TNF is the generation of the superoxide anion (O2-*). Superoxides tumor necrosis factor Mus musculus
3 In the present study, we attempted to examine the role of O2-* in the regulation of mitochondrial membrane potential (Delta(Psi)m) and the release of cytochrome c (cyto c) in L929 cells after stimulation with TNF. Superoxides tumor necrosis factor Mus musculus
4 Challenge of cells with TNF (50 ng/ml) resulted in an early (30 min after the addition of TNF) increase in the production of O2-*. Superoxides tumor necrosis factor Mus musculus
5 Challenge of cells with TNF (50 ng/ml) resulted in an early (30 min after the addition of TNF) increase in the production of O2-*. Superoxides tumor necrosis factor Mus musculus
6 The use of mitochondrial electron transport chain inhibitors such as antimycin A and rotenone could, respectively, potentiate or suppress the TNF-mediated release of O2-* and cytotoxicity. Superoxides tumor necrosis factor Mus musculus
7 TNF also induced a late (>3 h after the addition of TNF) depolarization in the Delta(Psi)m. Reduction in the release of O2-* by rotenone (50 microM) or thenoyltrifluoroacetone (250 microM) suppressed both the TNF-mediated Delta(Psi)m depolarization and cyto c release. Superoxides tumor necrosis factor Mus musculus
8 TNF also induced a late (>3 h after the addition of TNF) depolarization in the Delta(Psi)m. Reduction in the release of O2-* by rotenone (50 microM) or thenoyltrifluoroacetone (250 microM) suppressed both the TNF-mediated Delta(Psi)m depolarization and cyto c release. Superoxides tumor necrosis factor Mus musculus
9 TNF also induced a late (>3 h after the addition of TNF) depolarization in the Delta(Psi)m. Reduction in the release of O2-* by rotenone (50 microM) or thenoyltrifluoroacetone (250 microM) suppressed both the TNF-mediated Delta(Psi)m depolarization and cyto c release. Superoxides tumor necrosis factor Mus musculus
10 However, increase in the production of O2-* by antimycin A (25 microM) only slightly enhanced the TNF effect in altering the Delta(Psi)m and the release of cyto c. Treating cells with antimycin A alone could not induce a reduction in Delta(Psi)m nor a release of cyto c. Taken together, our results indicate that TNF induced damage in mitochondria in L929 cells. Superoxides tumor necrosis factor Mus musculus
11 However, increase in the production of O2-* by antimycin A (25 microM) only slightly enhanced the TNF effect in altering the Delta(Psi)m and the release of cyto c. Treating cells with antimycin A alone could not induce a reduction in Delta(Psi)m nor a release of cyto c. Taken together, our results indicate that TNF induced damage in mitochondria in L929 cells. Superoxides tumor necrosis factor Mus musculus
12 Our data also show that an increase in the production of O2-* was important in the TNF cytotoxicity, but was not sufficient to mimic the action of TNF. Superoxides tumor necrosis factor Mus musculus