1887

Abstract

Viral haemorrhagic fever (VHF) is caused by a number of viruses, including arenaviruses. The pathogenesis is believed to involve dysregulation of cytokine production. The arenaviruses and have a tropism for macrophages and other reticuloendothelial cells and both appear to suppress the normal macrophage response to virus infection. A decoy thioaptamer, XBY-S2, was developed and was found to bind to AP-1 transcription factor proteins. The P388D1 macrophage-like cell line contains members of the AP-1 family which may act as negative regulators of AP-1-controlled transcription. XBY-S2 was found to bind to Fra-2 and JunB, and enhance the induction of cytokines IL-6, IL-8 and TNF-, while reducing the binding to AP-1 promoter elements. Administration of XBY-S2 to Pichinde virus-infected guinea pigs resulted in a significant reduction in Pichinde virus-induced mortality and enhanced the expression of cytokines from primary guinea pig macrophages, which may contribute to its ability to increase survival of Pichinde virus-infected guinea pigs. These data demonstrate a proof of concept that thioaptamers can be used to modulate the outcome of viral infections by arenaviruses by the manipulation of transcription factors involved in the regulation of the immune response.

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2007-03-01
2019-11-20
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