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• W1520284993 endingPage "1969" @default.
• W1520284993 startingPage "1959" @default.
• W1520284993 abstract "IFN-gamma contains a nuclear localization sequence that may play a role in the nuclear transport of activated STAT1alpha via a complex of IFN-gamma/IFN-gamma receptor (IFNGR)-1/STAT1alpha with the nuclear importer nucleoprotein interactor 1. In this study, we examine the mechanism of endocytosis of IFNGR-1 and the relationship of its nuclear translocation to that of STAT1alpha. In untreated WISH cells, both IFNGR-1 and IFNGR-2 were constitutively localized within caveolae-like microdomains isolated from plasma membrane. However, treatment of cells with IFN-gamma resulted in rapid migration of IFNGR-1, but not IFNGR-2, from these microdomains. Filipin pretreatment, which specifically inhibits endocytosis from caveolae-like microdomains, inhibited the nuclear translocation of IFN-gamma and IFNGR-1 as well as the tyrosine phosphorylation and nuclear translocation of STAT1alpha, but did not affect the binding of IFN-gamma to these cells. In the Jurkat T lymphocyte cell line, which does not express caveolin-1, nuclear translocation of IFNGR-1 and STAT1alpha were similarly inhibited by filipin pretreatment. Isolation of lipid microdomains from Jurkat cells showed that both IFNGR-1 and IFNGR-2 were associated with lipid microdomains only after stimulation with IFN-gamma, suggesting that the IFNGR subunits are recruited to lipid microdomains by IFN-gamma binding in lymphocytes (Jurkat) in contrast to their constitutive presence in epithelial (WISH) cells. In contrast, treatments that block clathrin-dependent endocytosis did not inhibit either activation or nuclear translocation of STAT1alpha or the nuclear translocation of IFN-gamma or IFNGR-1. Thus, membrane lipid microdomains play an important role in IFN-gamma-initiated endocytic events involving IFNGR-1, and the nuclear translocation of IFN-gamma, IFNGR-1, and STAT1alpha." @default.
• W1520284993 created "2016-06-24" @default.
• W1520284993 creator A5023419211 @default.
• W1520284993 creator A5040070946 @default.
• W1520284993 date "2002-08-15" @default.
• W1520284993 modified "2023-10-03" @default.
• W1520284993 title "Lipid Microdomains Are Required Sites for the Selective Endocytosis and Nuclear Translocation of IFN-γ, Its Receptor Chain IFN-γ Receptor-1, and the Phosphorylation and Nuclear Translocation of STAT1α" @default.
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• W1520284993 doi "https://doi.org/10.4049/jimmunol.169.4.1959" @default.
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