Macrophages are the immune system’s first line of defence. Via pattern recognition receptors microbes are recognised as foreign and elicit a rapid massive production of cytokines, chemokines and other mediators important for host defence. Recognition of bacterial lipopolysaccharide (LPS) by Toll-like receptor 4 (TLR4) activates some known signalling pathways (MAPK, NF-κB) and transcription factors (CREB/AP-1, NF-κB, IRF). Through a phosphoproteome analysis, this thesis provides for the first time a global and quantitative picture of the involved signalling pathways, kinases and transcription factors. Bioinformatic analyses for enriched kinase motifs, Gene Ontology and signalling pathway annotation identified in particular the PI3K/AKT, mTOR and Ca2+ pathways, as well as the cell cycle and the cytoskeleton as novel hotspots of LPS-regulated phosphorylation. Finally, integration of phosphoproteome and nascent transcriptome data by in silico promoter analysis identified novel transcription factors, which act at the intersection of TLR-induced kinase activation and gene expression.
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Macrophages are the immune system’s first line of defence. Via pattern recognition receptors microbes are recognised as foreign and elicit a rapid massive production of cytokines, chemokines and other mediators important for host defence. Recognition of bacterial lipopolysaccharide (LPS) by Toll-like receptor 4 (TLR4) activates some known signalling pathways (MAPK, NF-κB) and transcription factors (CREB/AP-1, NF-κB, IRF). Through a phosphoproteome analysis, this thesis provides for the first tim...
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