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- W2046534502 abstract "It has been suggested that Fas-mediated apoptosis plays an important role in the pathogenesis of autoimmune thyroid diseases. Our previous studies have demonstrated that normal primary thyroid epithelial cells are resistant to Fas-mediated apoptosis, but the resistance can be overcome by pretreatment with a combination of interferon-γ (IFN-γ) and IL-1β. To understand the molecular mechanism responsible for the IFN-γ/IL-1β effects, we profiled changes in the transcription induced by these two cytokines in normal human thyroid cells, using cDNA microarrays. We found that IFN-γ/IL-1β showed a significant increase in apoptosis-related genes such as inducible nitric oxide synthase (iNOS), receptor-interacting protein 2 (RIP2), and caspases 10. These increases were confirmed by other methods, including real-time PCR and Western blot. Furthermore, the sensitization of primary thyroid epithelial cells to Fas-mediated apoptosis by IFN-γ/IL-1β was significantly blocked by a general caspase inhibitor, z-VAD, or by the combination of two specific individual caspase inhibitors. In addition, our results showed that IFN-γ/IL-1β enhance p38 MAPK phosphorylation and that SB 203580, a p38 MAPK inhibitor, can inhibit IFN-γ/IL-1β-induced p38 MAPK phosphorylation. SB 203580 also significantly prevented cytokine-induced iNOS expression and caspase activation and thus blocked Fas-mediated apoptosis of thyroid cells sensitized by IFN-γ/IL-1β. In conclusion, our data suggest that both p38 MAPK and iNOS are involved in IFN-γ/IL-1β-induced sensitization of the thyroid cells to Fas-mediated apoptosis via the activation of caspases 3, 7, and 10 and that this pathway may be further activated by BID. This hints that inflammatory cytokines regulate death-receptor-mediated apoptosis at multiple points in the process." @default.
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- W2046534502 date "2007-10-01" @default.
- W2046534502 modified "2023-10-03" @default.
- W2046534502 title "Microarray Analysis of Cytokine Activation of Apoptosis Pathways in the Thyroid" @default.
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- W2046534502 doi "https://doi.org/10.1210/en.2007-0126" @default.
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