Peripheral inflammation is associated with remote global gene expression changes in the brain

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• 作者：Carolyn A Thomson (8)
  Alison McColl (8)
  Jonathan Cavanagh (9)
  Gerard J Graham (8)
  
  8. Institute of Infection ; Immunity & Inflammation ; College of Medical & Veterinary Life Sciences ; University of Glasgow ; 120 University Place ; Glasgow ; G12 8TA ; UK
  9. Institute of Health & Wellbeing ; College of Medical & Veterinary Life Sciences ; University of Glasgow ; Southern General Hospital ; Glasgow ; G51 4TF ; UK
  
• 关键词：cytokines ; innate immunity ; interferons ; interferon ; stimulated genes ; lipopolysaccharide ; neuroimmune communication ; neuroinflammation ; systemic inflammation ; toll ; like ; receptor ligation
• 刊名：Journal of Neuroinflammation
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：11
• 期：1
• 全文大小：449 KB
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• 刊物主题：Neurosciences; Neurology; Neurobiology; Immunology;
• 出版者：BioMed Central
• ISSN：1742-2094

文摘

Background Although the central nervous system (CNS) was once considered an immunologically privileged site, in recent years it has become increasingly evident that cross talk between the immune system and the CNS does occur. As a result, patients with chronic inflammatory diseases, such as rheumatoid arthritis, inflammatory bowel disease or psoriasis, are often further burdened with neuropsychiatric symptoms, such as depression, anxiety and fatigue. Despite the recent advances in our understanding of neuroimmune communication pathways, the precise effect of peripheral immune activation on neural circuitry remains unclear. Utilizing transcriptomics in a well-characterized murine model of systemic inflammation, we have started to investigate the molecular mechanisms by which inflammation originating in the periphery can induce transcriptional modulation in the brain. Methods Several different systemic and tissue-specific models of peripheral toll-like-receptor-(TLR)-driven (lipopolysaccharide (LPS), lipoteichoic acid and Imiquimod) and sterile (tumour necrosis factor (TNF) and 12-O-tetradecanoylphorbol-13-acetate (TPA)) inflammation were induced in C57BL/6 mice. Whole brain transcriptional profiles were assessed and compared 48 hours after intraperitoneal injection of lipopolysaccharide or vehicle, using Affymetrix GeneChip microarrays. Target gene induction, identified by microarray analysis, was validated independently using qPCR. Expression of the same panel of target genes was then investigated in a number of sterile and other TLR-dependent models of peripheral inflammation. Results Microarray analysis of whole brains collected 48 hr after LPS challenge revealed increased transcription of a range of interferon-stimulated genes (ISGs) in the brain. In addition to acute LPS challenge, ISGs were induced in the brain following both chronic LPS-induced systemic inflammation and Imiquimod-induced skin inflammation. Unique to the brain, this transcriptional response is indicative of peripherally triggered, interferon-mediated CNS inflammation. Similar models of sterile inflammation and lipoteichoic-acid-induced systemic inflammation did not share the capacity to trigger ISG induction in the brain. Conclusions These data highlight ISG induction in the brain as being a consequence of a TLR-induced type I interferon response. As considerable evidence links type I interferons to psychiatric disorders, we hypothesize that interferon production in the brain could represent an important mechanism, linking peripheral TLR-induced inflammation with behavioural changes.