Molecular pathogenesis of influenza A virus infection and virus-induced regulation of cytokine gene expression

Cytokine & Growth Factor Reviews
I JulkunenS Matikainen

Abstract

Despite vaccines and antiviral substances influenza still causes significant morbidity and mortality world wide. Better understanding of the molecular mechanisms of influenza virus replication, pathogenesis and host immune responses is required for the development of more efficient means of prevention and treatment of influenza. Influenza A virus, which replicates in epithelial cells and leukocytes, regulates host cell transcriptional and translational systems and activates, as well as downregulates apoptotic pathways. Influenza A virus infection results in the production of chemotactic (RANTES, MIP-1 alpha, MCP-1, MCP-3, and IP-10), pro-inflammatory (IL-1 beta, IL-6, IL-18, and TNF-alpha), and antiviral (IFN-alpha/beta) cytokines. Cytokine gene expression is associated with the activation of NF-kappa B, AP-1, STAT and IRF signal transducing molecules in influenza A virus-infected cells. In addition of upregulating cytokine gene expression, influenza A virus infection activates caspase-1 enzyme, which is involved in the proteolytic processing of proIL-1 beta and proIL-18 into their biologically active forms. Influenza A virus-induced IFN-alpha/beta is essential in host's antiviral defence by activating the expression of antivir...Continue Reading

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