In the present study, we investigated the gene expression of IL-8 and MCP-1 in HaCaT keratinocytes in
response to poly(I:C), a synthetic dsRNA analogon. Both gene inductions were found to be mediated by TLR3 and
downstream signalling pathways. While poly(I:C) induced IL-8 gene expression was solely inhibited by the NF-κB
inhibitor III, MCP-1 gene induction was also blocked by PKA, p38 MAPK and JAK-STAT inhibitors. Moreover,
Brefeldin A, an inhibitor of the anterograde transport, suppressed MCP-1 but not IL-8 gene expression, indicating that
poly(I:C)-induced cytokines are involved in the chemokine gene expression. Both chemokines were expressed in response
to the pro-inflammatory cytokines TNFα and IL-1β; however, MCP-1 gene induction was also found in response to IFNγ.
These data are indicative for distinct signalling pathways in the poly(I:C)-induced gene expression of IL-8 and MCP-1 in
Keywords: Cytokine burst, HaCaT keratinocytes, Interleukin 8, monocyte chemotactic protein-1, nonviral dsRNA, toll-like
receptor 3, pathogen recognition receptors, proinflammatory cytokines, chemokine, TLR3.
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Published on: 26 September, 2012
Page: [397 - 405]