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- W2001625025 abstract "Abstract FcϵRI-activation–induced survival of mast cells is dependent on the expression and function of the prosurvival protein A1. The expression of A1 in lymphocytes and monocytes has previously been described to be transcriptionally regulated by NF-κB. Here we demonstrate that the expression of A1 in mast cells is not dependent on NF-κB but that NFAT plays a crucial role. FcϵRI-induced A1 expression was not affected in mast cells overexpressing an IκB-α super-repressor or cells lacking NF-κB subunits RelA, c-Rel, or c-Rel plus NF-κB1 p50. In contrast, inhibition of calcineurin and NFAT by cyclosporin A abrogated the expression of A1 in mast cells on FcϵRI-activation but had no effect on lipopolysaccharide-induced expression of A1 in J774A.1 monocytic cells. Cyclosporin A also inhibited luciferase expression in an A1 promoter reporter assay. A putative NFAT binding site in the A1 promoter showed inducible protein binding after FcϵRI crosslinking or treatment with ionomycin as detected in a band shift assay or chromatin immunoprecipitation. The binding protein was identified as NFAT1. Finally, mast cells expressing constitutively active NFAT1 exhibit increased expression of A1 after FcϵRI-stimulation. These results indicate that, in FcϵRI stimulated mast cells, A1 is transcriptionally regulated by NFAT1 but not by NF-κB." @default.
- W2001625025 created "2016-06-24" @default.
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- W2001625025 date "2008-03-15" @default.
- W2001625025 modified "2023-10-12" @default.
- W2001625025 title "NFAT but not NF-κB is critical for transcriptional induction of the prosurvival gene A1 after IgE receptor activation in mast cells" @default.
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- W2001625025 doi "https://doi.org/10.1182/blood-2006-10-053371" @default.
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