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• W2159853438 abstract "Tumor necrosis factor (TNF)-α induces caspase-independent cell death in the fibrosarcoma cell line L929. This cell death has a necrotic phenotype and is dependent on production of reactive oxygen species (ROS) in the mitochondria. To identify genes involved in this TNF-induced, ROS-dependent cell death pathway, we utilized retrovirus insertion-mediated random mutagenesis to generate TNF-resistant L929 cell lines and we subsequently identified genes whose mutations are responsible for the TNF-resistant phenotype. In one such resistant line, β-actin was disrupted by viral insertion, and subsequent reconstitution of β-actin expression levels in the mutant line Actinmut restored its sensitivity to TNF. Resistance to TNF in Actinmut cells is signal specific since the sensitivity to other death stimuli is either unchanged or even increased. Comparable NF-κB activation and p38 phosphorylation in TNF-treated wild-type and Actinmut cells also indicates that reduced expression of actin only selectively blocked some of the TNF-induced cellular changes. Actin cleavage involved in apoptosis does not occur in TNF-treated L929 cell death, as in HeLa cells. Consistent over-expression of a caspase-cleaved product, a 15 kDa actin fragment, had no effect on TNF-induced necrosis of L929 cell. By contrast, TNF-induced mitochondria clustering and ROS production were dramatically reduced in Actinmut cells, indicating that actin-deficiency-mediated TNF resistance is most likely due to impaired mitochondrial responses to TNF stimulation. Our findings suggest that a full complement of actin is required for transduction of a cell death signal to mitochondria in TNF-treated L929 cells." @default.
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• W2159853438 date "2004-09-15" @default.
• W2159853438 modified "2023-09-29" @default.
• W2159853438 title "β-actin is required for mitochondria clustering and ROS generation in TNF-induced, caspase-independent cell death" @default.
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• W2159853438 doi "https://doi.org/10.1242/jcs.01339" @default.
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