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- W2045409864 abstract "Osteopontin (OPN) is a secreted phosphoglycoprotein with a wide range of functions, and is involved in various pathophysiological conditions. However, the role of OPN in IgE and Th2-associated allergic responses remains incompletely defined. The aim of this study was to elucidate the role of OPN in systemic allergen sensitization in mice. When compared with OPN(+/+) mice, significantly increased levels of OVA-induced IgE were found in OPN(-/-) mice. OPN(-/-) DC demonstrated an increased capacity to enhance Th2 cytokine production in CD4+ T cells from sensitized OPN(+/+) mice. Furthermore, significantly reduced levels of IL-12p70 expression were seen in LPS-stimulated OPN(-/-) DC as compared with the WT DC, and the reduction was reversible by the addition of recombinant OPN (rOPN). rOPN was able to suppress OVA-induced IL-13 production in the cultures of CD4 and OPN(-/-) DC, but this inhibitory activity was neutralized by the addition of anti-IL-12 Ab. In addition, administration of rOPN in vivo suppressed OVA-specific IgE production; however, this suppressive effect was abrogated in IL-12-deficient mice. These results indicate that DC-derived OPN plays a regulatory role in the development of systemic allergen sensitization, which is mediated, at least in part, through the production of endogenous IL-12." @default.
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- W2045409864 date "2009-10-14" @default.
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- W2045409864 title "Regulatory role of DC-derived osteopontin in systemic allergen sensitization" @default.
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- W2045409864 doi "https://doi.org/10.1002/eji.200838970" @default.
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