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• W2029451923 abstract "Abstract Background Lipocalin 2 (Lcn2) is a bacteriostatic factor that may also modulate cellular function, however, little is known concerning the expression or role of Lcn2 in CNS inflammation. Therefore, here we investigated the regulation and possible function of Lcn2 in the CNS following peripheral lipopolysaccharide (LPS) injection in mice. Methods A murine model for systemic endotoxemia was used in this study. Wild type or Lcn2 KO mice (both genotypes C57BL/6 strain) were given either a single or dual, staggered intraperitoneal injections of purified E. coli LPS or vehicle alone. The brain was examined for the expression and location of Lcn2 mRNA and protein and various markers for neuroinflammation were analyzed. Results Although undetectable under physiological conditions, both Lcn2 mRNA and protein were induced to high levels in the brain after LPS injection. By contrast, RNA corresponding to the putative Lcn2 (termed 24p3R) receptor was present at high levels in the normal brain and remained unaltered by LPS injection. Differences between Lcn2 and 24p3R mRNA expression were found at the anatomic and cellular level. Endothelial cells, microglia and the choroid plexus but not neurons were identified as the main cellular sources for Lcn2 mRNA in the CNS. By contrast, 24p3R mRNA was detected in neurons and the choroid plexus only. Lcn2 protein was found to have a similar cellular localization as the corresponding RNA transcripts with the exception that subsets of neurons were also strongly positive. Various inflammatory, glial, and iron handling markers were analyzed and found to have similar alterations between WT and Lcn2 KO animals. Conclusions 1) Lcn2 production is strongly induced in the CNS by systemic LPS injection, 2) in addition to Lcn2 production at key gateways of bacterial entry to the CNS, neurons may be a target for the actions of Lcn2, which is apparently taken up by these cells, and 3) the cellular functions of Lcn2 in the CNS remain enigmatic." @default.
• W2029451923 created "2016-06-24" @default.
• W2029451923 creator A5059430746 @default.
• W2029451923 creator A5060868968 @default.
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• W2029451923 date "2011-09-26" @default.
• W2029451923 modified "2023-10-03" @default.
• W2029451923 title "Lipocalin 2 in the central nervous system host response to systemic lipopolysaccharide administration" @default.
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• W2029451923 doi "https://doi.org/10.1186/1742-2094-8-124" @default.
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