Abstract
Objective
Interleukin-6 (IL-6), which is increased in patients who are suffering from septic shock, is an important mediator of the inflammatory response. Here, we examined the priming effect of lipoteichoic acid (LTA) and lipopolysaccharide (LPS) on IL-6 production in a monocyte-like cell line.
Methods
THP-1 cells were primed by treatingwith a low or high dose of LTA isolated from Staphylococcus aureus (aLTA) and then re-treated with LPS. IL-6 production, receptor expression, and the variation of signaling molecules were examined by ELISA, reverse transcriptase polymerase chain reaction, and western blotting, respectively.
Results
LPS-mediated IL-6 production was dramatically increased in THP-1 cells pretreated with a low dose aLTA, while it was significantly decreased when a high dose of aLTA was given along with LPS. LPS-induced IL-6 production in low dose aLTA priming cells mediated by NF-κB and MAPKs pathways, and Akt functioned as a negative regulator of IL-6 production. Together, the results of this study suggest that different doses of bacterial cell surface components can mediate a diverse range of responses with respect to inflammatory cytokine production.
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Acknowledgments
A national Research Foundation of Korea (NRF) grant foundation by the Korea government (MEST)(No. 2010-0012091) supported this work.
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Kim, H., Jung, B.J., Kim, J.Y. et al. Differential effects of low and high doses of lipoteichoic acid on lipopolysaccharide-induced interleukin-6 production. Inflamm. Res. 63, 419–428 (2014). https://doi.org/10.1007/s00011-014-0714-8
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DOI: https://doi.org/10.1007/s00011-014-0714-8