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KMID : 0545120060160101605
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Journal of Microbiology and Biotechnology
2006 Volume.16 No. 10 p.1605 ~ p.1612
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Synergistic Effect of Interleukin-18 on the Expression of Lipopolysaccharide-Induced IP-10 (CXCL-10) mRNA in Mouse Peritoneal Macrophages
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Kim Hyo-Young
Kim Jae-Ryong
Kim Hee-Sun
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Abstract
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Interleukin (IL)-18, a member of the family of IL-l cytokine, is one of the principal inducers of in T lymphocytes and natural killer cells. The objective of the present study was to evaluate the effect of IL-18 on the expression of chemokine IP-10 (CXCL-10) mRNA in mouse peritoneal macrophages. IL-18 had very weak direct effect or synergistic effect with IL-12 on the expression of IP-10 mRNA in C57BL/6 mouse peritoneal macrophages. However, IL-18 pretreatment was found to playa cooperative role in the expression of lipopolysaccharide (LPS)-induced IP-10 mRNA. For the expression of LPS-induced IP-10 mRNA, the synergistic effect was detected after 16 h of IL-18 pretreatment prior to LPS stimulation. The expression level of CD14 in cells stimulated with LPS was not changed by IL-18 pretreatment, and the level of production during IL-18 pretreatment plus LPS stimulation was barely discernible (). Namely, the synergistic effect of IL-18 pretreatment was not related to a change of LPS receptor, CD14 expression, and the production of by the interaction between IL-18 and LPS. The synergistic effect of IL-18 pretreatment on the expression of LPS-induced IP-10 was related to not NF-kB but AP-1 activation, and associated with the extracellular signal-regulated kinase (ERK) pathway, one of the mitogen-activated protein kinase signaling pathways. These results provide useful information that may elucidate the mechanisms underlying the effect of IL-18 on the expression of IP-10 mRNA.
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KEYWORD
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Interleukin-18, IP-10, lipopolysaccharide
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