title: Cutting edge: Divergent cell-specific functions of MyD88 for inflammatory responses and organ injury in septic peritonitis.
abstract: Although global MyD88 deficiency attenuates lethal inflammation in sepsis, cell-specific functions of MyD88 remain largely unknown. Using mice with selective expression of MyD88 in myeloid cells (Myd88(MYEL)), we show that, during polymicrobial septic peritonitis, both myeloid and nonmyeloid cells contribute to systemic inflammation, whereas myeloid cell MyD88 was sufficient to fully establish the peritoneal cytokine response. Importantly, Myd88(MYEL) mice developed markedly aggravated liver injury that was linked to impaired upregulation of cellular inhibitor of apoptosis protein 2 and an excessive production of TNF-α. Upregulation of inducible cAMP early repressor (ICER), a known transcriptional repressor of the Tnfa gene, was impaired in Myd88(MYEL) mice. Moreover, Myd88(MYEL) mice showed enhanced transcription of the Tnfa gene and an excessive production of CCL3, which is also negatively regulated by ICER, but they had normal levels of CXCL1, which is expressed in an ICER-independent manner. Together, these findings suggest a novel protective role for nonmyeloid cell MyD88 in attenuating liver injury during septic peritonitis.
authors.affiliation: Chirurgische Klinik und Poliklinik, Technische Universität München, 81675 Munich, Germany.
authors.forename: Petra
authors.initials: P
authors.lastname: Gais
authors.forename: Daniel
authors.initials: D
authors.lastname: Reim
authors.forename: Gabriela
authors.initials: G
authors.lastname: Jusek
authors.forename: Tanja
authors.initials: T
authors.lastname: Rossmann-Bloeck
authors.forename: Heike
authors.initials: H
authors.lastname: Weighardt
authors.forename: Klaus
authors.initials: K
authors.lastname: Pfeffer
authors.forename: Felicitas
authors.initials: F
authors.lastname: Altmayr
authors.forename: Klaus-Peter
authors.initials: KP
authors.lastname: Janssen
authors.forename: Bernhard
authors.initials: B
authors.lastname: Holzmann
mesh_terms: D000818:Animals; D051786:Cyclic AMP Response Element Modulator / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D007249:Inflammation / Q000276:immunology / Q000378:metabolism; D051034:Inhibitor of Apoptosis Proteins / Q000276:immunology / Q000378:metabolism; D008099:Liver / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D008168:Lung / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D022423:Myeloid Cells / Q000276:immunology / Q000378:metabolism; D053594:Myeloid Differentiation Factor 88 / Q000276:immunology* / Q000378:metabolism; D010538:Peritonitis / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D018805:Sepsis / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology / Q000378:metabolism
chemical_list: C497411:Crem protein, mouse; D051034:Inhibitor of Apoptosis Proteins; C507780:Myd88 protein, mouse; D053594:Myeloid Differentiation Factor 88; D014409:Tumor Necrosis Factor-alpha; D051786:Cyclic AMP Response Element Modulator