Requirement for glycogen synthase kinase-3beta in cell survival and NF-kappaB activation - PubMed (original) (raw)
. 2000 Jul 6;406(6791):86-90.
doi: 10.1038/35017574.
Affiliations
- PMID: 10894547
- DOI: 10.1038/35017574
Requirement for glycogen synthase kinase-3beta in cell survival and NF-kappaB activation
K P Hoeflich et al. Nature. 2000.
Abstract
Glycogen synthase kinase-3 (GSK-3)-alpha and -beta are closely related protein-serine kinases, which act as inhibitory components of Wnt signalling during embryonic development and cell proliferation in adult tissues. Insight into the physiological function of GSK-3 has emerged from genetic analysis in Drosophila, Dictyostelium and yeast. Here we show that disruption of the murine GSK-3beta gene results in embryonic lethality caused by severe liver degeneration during mid-gestation, a phenotype consistent with excessive tumour necrosis factor (TNF) toxicity, as observed in mice lacking genes involved in the activation of the transcription factor activation NF-kappaB. GSK-3beta-deficient embryos were rescued by inhibition of TNF using an anti-TNF-alpha antibody. Fibroblasts from GSK-3beta-deficient embryos were hypersensitive to TNF-alpha and showed reduced NF-kappaB function. Lithium treatment (which inhibits GSK-3; refs 8, 9) sensitized wild-type fibroblasts to TNF and inhibited transactivation of NF-kappaB. The early steps leading to NF-kappaB activation (degradation of I-kappaB and translocation of NF-kappaB to the nucleus) were unaffected by the loss of GSK-3beta, indicating that NF-kappaB is regulated by GSK-3beta at the level of the transcriptional complex. Thus, GSK-3beta facilitates NF-kappaB function.
Comment in
- Signal transduction. A cellular rescue team.
Pomerantz JL, Baltimore D. Pomerantz JL, et al. Nature. 2000 Jul 6;406(6791):26-7, 29. doi: 10.1038/35017673. Nature. 2000. PMID: 10894524 No abstract available.
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