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- W4313308219 abstract "Abstract Although the molecular mechanisms by which the HIV-1 triggers either T cell activation, anergy, or apoptosis remain poorly understood, it is well established that the interaction of HIV-1 envelope glycoproteins with cell surface CD4 delivers signals to the target cell, resulting in activation of transcription factors such as NF-κB and AP-1. In this study, we report the first evidence indicating that kinases MEK-1 (MAP kinase/Erk kinase) and ERK-1 (extracellular signal-regulated kinase) act as intermediates in the cascade of events that regulate NF-κB and AP-1 activation upon HIV-1 binding to cell surface CD4. We found that CEM cells transfected with dominant negative forms of MEK-1 or ERK-1 do not display NF-κB activation after HIV-1 binding to CD4. In contrast, NF-κB activation was observed in these cells after PMA stimulation. Although the different cell lines studied expressed similar amounts of CD4 and p56lck, HIV-1 replication and HIV-1-induced apoptosis were slightly delayed in cells expressing dominant negative forms of MEK-1 or ERK-1 compared with parental CEM cells and cells expressing a constitutively active mutant form of MEK-1 or wild-type ERK-1. In light of recently published data, we propose that a positive signal initiated following oligomerization of CD4 by the virus is likely to involve a recruitment of active forms of p56lck, Raf-1, MEK-1, and ERK-1, before AP-1 and NF-κB activation." @default.
- W4313308219 created "2023-01-06" @default.
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- W4313308219 date "1998-02-15" @default.
- W4313308219 modified "2023-10-18" @default.
- W4313308219 title "Involvement of Extracellular Signal-Regulated Kinase Module in HIV-Mediated CD4 Signals Controlling Activation of Nuclear Factor-κB and AP-1 Transcription Factors" @default.
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- W4313308219 doi "https://doi.org/10.4049/jimmunol.160.4.1875" @default.
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