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- W2092350536 abstract "Macrophage-activating lipopeptide-2 (MALP-2) has been identified as the pathogen-associated molecular pattern of Mycoplasma fermentans, which causes stimulation of the innate immune system through the activation of the heterodimeric Toll-like receptors (TLRs) 2 and 6. Based on the reported protective effects of MALP-2 on healing of skin wounds, the central goal of this study was to evaluate the capacity of MALP-2 to induce a localized inflammatory response in an established model of a subcutaneous air pouch. Injections of MALP-2 into the pouch caused fever and some components of sickness behavior in rats. At the subcutaneous site of localized inflammation, a massive formation of tumor necrosis factor-alpha (TNF), interleukin-6 (IL-6), and prostaglandin E2 (PGE2) could be demonstrated in response to injections of MALP-2. Moderate amounts of IL-6 and PGE2 seemed to enter the systemic circulation of MALP-2-treated rats. The IL-6, which appeared in the blood after injection of MALP-2 into the air pouch was sufficient to cause a direct activation of brain cells in areas which lack a complete blood-brain barrier, namely in the sensory circumventricular organs (sCVOs), the organum vasculosum laminae terminalis (OVLT), the subfornical organ (SFO), and the area postrema (AP). The stimulation of cells at these brain sites was revealed by demonstration of a nuclear translocation of the transcription factor STAT3 (signal transducer and activator of transcription 3). Corresponding to the circulating levels of IL-6, the nuclear STAT3 activation of cells within the sCVOs was much less pronounced after local subcutaneous when compared to systemic treatment with MALP-2. In conclusion, cells within the subcutaneous compartment are activated by the TLR2/6 agonist MALP-2. Fever and sickness behavior induced by injection of MALP-2 into subcutaneous tissue may, in part, be mediated by a spillover of IL-6 from the subcutaneous site of inflammation into the blood to cause activation of brain sites which are implicated in the manifestation of these illness responses." @default.
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- W2092350536 date "2008-04-01" @default.
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- W2092350536 title "Macrophage-activating lipopeptide-2 (MALP-2) induces a localized inflammatory response in rats resulting in activation of brain sites implicated in fever" @default.
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- W2092350536 doi "https://doi.org/10.1016/j.brainres.2008.02.021" @default.
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