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- W4313333734 abstract "Abstract Elevated levels of circulating IL-8, a potent chemotactic factor for granulocytes and T lymphocytes, are found in HIV-infected individuals. The HIV-1 transactivator protein Tat increased IL-8 secretion in T cell lines following CD3- and CD28-mediated costimulation. Full-length Tat (Tat101) enhanced IL-8 transcription through up-regulated transcription factor binding to the CD28-responsive element (CD28RE) in the IL-8 promoter. Expression of the Tat splice variant Tat72 (72 amino acids) also enhanced IL-8 production following T cell stimulation via a different, most likely post-transcriptional, mechanism. The CD28RE in the IL-8 promoter was characterized as a low-affinity NF-κB binding site recognized by the transcription factors p50 (NF-κB1), p65 (RelA) and c-rel. Transcription factor binding to “classical” NF-κB sites in the HIV-1, the human IL-2, and lymphotoxin promoters, recognized by p50 and p65 following CD3+28-mediated costimulation, was unaffected by Tat101 as was binding to the AP-1 motif in the IL-8 promoter. These experiments identify the CD28RE in the IL-8 promoter as a c-rel recognition site and a Tat101-responsive element. The effect of Tat101 on CD28REs in the IL-8 promoter and the subsequent up-regulation of IL-8 secretion is likely to contribute to the immune dysregulation observed during HIV-1 infection." @default.
- W4313333734 created "2023-01-06" @default.
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- W4313333734 date "1998-03-15" @default.
- W4313333734 modified "2023-10-14" @default.
- W4313333734 title "Superinduction of IL-8 in T Cells by HIV-1 Tat Protein Is Mediated Through NF-κB Factors" @default.
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- W4313333734 doi "https://doi.org/10.4049/jimmunol.160.6.2872" @default.
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