Expression of transcription factor genes after influenza A virus infection

Immunobiology
D BussfeldH Sprenger

Abstract

Infection of human monocytes with influenza A virus induces a broad range of proinflammatory cytokines and mononuclear cell attracting chemokines before the infected cells undergo apoptosis. The underlying mechanisms by which the corresponding genes are transcriptionally initiated after virus infection are still poorly understood. Activation of NF-kappa B seems to play an important role in the regulation of many proinflammatory cytokine genes, but cannot be the only mechanism, since several cytokine genes lack respective binding sites in their promoter regions. Therefore, we additionally investigated other transcription factors of possible importance such as CREB, CTF, OTF-1, and OTF-2. To explore long-term regulatory mechanisms, we investigated the induction of transcription factors on the gene expression level which may be important to substitute for metabolized transcription factor proteins after their activation. We identified a cell-type-specific differential response: CREB, CTF, OTF-1, OFT-2, and NF-kappa B genes were strongly induced 1 to 4 hours after influenza A virus infection in the monocytic cell line Mono Mac 6, while in freshly prepared human monocytes no significant changes were detected. In infected monocytes, w...Continue Reading

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis