Hantaan virus induces toll-like receptor 4 expression, leading to enhanced production of beta interferon, interleukin-6 and tumor necrosis factor-alpha

Virology
Hong JiangXue-Fan Bai

Abstract

Hantaan virus (HTNV) infects endothelial cells and is associated with increased vascular permeability during hemorrhagic fever with renal syndrome (HFRS). The pattern of increased vascular permeability is mediated by immune response. Therefore, it is necessary to characterize the mechanism of HTNV involvement in the host's innate immune. In this study, the expression of five toll-like receptors (TLRs) was analyzed in Endothelial vein cells (EVC-304) following HTNV infection in vitro. TLR4 showed an altered expression after HTNV infection. HTNV infection significantly increased IFN-beta, IL-6 and TNF-alpha secretion from EVC-304 cells, particularly after lipopolysaccharide stimulation. The increased IFN-beta, IL-6 and TNF-alpha production was mediated by TLR4 induction, since the introduction of the small interfering RNA against TLR4 specifically inhibited the HTNV-induced cytokine production. In conclusion, HTNV infection directly induces TLR4 expression and thereby enhanced production of IFN-beta, IL-6 and TNF-alpha, which may contribute to the host's innate immune response.

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