title: IL-1R1/MyD88 signaling and the inflammasome are essential in pulmonary inflammation and fibrosis in mice.
abstract: The molecular mechanisms of acute lung injury resulting in inflammation and fibrosis are not well established. Here we investigate the roles of the IL-1 receptor 1 (IL-1R1) and the common adaptor for Toll/IL-1R signal transduction, MyD88, in this process using a murine model of acute pulmonary injury. Bleomycin insult results in expression of neutrophil and lymphocyte chemotactic factors, chronic inflammation, remodeling, and fibrosis. We demonstrate that these end points were attenuated in the lungs of IL-1R1- and MyD88-deficient mice. Further, in bone marrow chimera experiments, bleomycin-induced inflammation required primarily MyD88 signaling from radioresistant resident cells. Exogenous rIL-1beta recapitulated a high degree of bleomycin-induced lung pathology, and specific blockade of IL-1R1 by IL-1 receptor antagonist dramatically reduced bleomycin-induced inflammation. Finally, we found that lung IL-1beta production and inflammation in response to bleomycin required ASC, an inflammasome adaptor molecule. In conclusion, bleomycin-induced lung pathology required the inflammasome and IL-1R1/MyD88 signaling, and IL-1 represented a critical effector of pathology and therapeutic target of chronic lung inflammation and fibrosis.
authors.affiliation: Laboratory of Molecular Immunology and Embryology, University of Orleans and CNRS, Orleans, France.
authors.forename: Pamela
authors.initials: P
authors.lastname: Gasse
authors.forename: Caroline
authors.initials: C
authors.lastname: Mary
authors.forename: Isabelle
authors.initials: I
authors.lastname: Guenon
authors.forename: Nicolas
authors.initials: N
authors.lastname: Noulin
authors.forename: Sabine
authors.initials: S
authors.lastname: Charron
authors.forename: Silvia
authors.initials: S
authors.lastname: Schnyder-Candrian
authors.forename: Bruno
authors.initials: B
authors.lastname: Schnyder
authors.forename: Shizuo
authors.initials: S
authors.lastname: Akira
authors.forename: Valérie F J
authors.initials: VF
authors.lastname: Quesniaux
authors.forename: Vincent
authors.initials: V
authors.lastname: Lagente
authors.forename: Bernhard
authors.initials: B
authors.lastname: Ryffel
authors.forename: Isabelle
authors.initials: I
authors.lastname: Couillin
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000633:toxicity; D001761:Bleomycin / Q000633:toxicity; D016026:Bone Marrow Transplantation; D002908:Chronic Disease; D004195:Disease Models, Animal; D006801:Humans; D053590:Interleukin 1 Receptor Antagonist Protein / Q000494:pharmacology; D053583:Interleukin-1beta / Q000494:pharmacology; D016209:Interleukin-8 / Q000235:genetics / Q000378:metabolism; D008222:Lymphokines / Q000235:genetics / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D053594:Myeloid Differentiation Factor 88 / Q000235:genetics / Q000378:metabolism*; D011014:Pneumonia / Q000139:chemically induced / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D011658:Pulmonary Fibrosis / Q000139:chemically induced / Q000378:metabolism* / Q000473:pathology; D053573:Receptors, Interleukin-1 Type I / Q000819:agonists / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D011994:Recombinant Proteins / Q000494:pharmacology; D012128:Respiratory Distress Syndrome / Q000139:chemically induced / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D012795:Sialoglycoproteins / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects / Q000235:genetics; D018183:Transplantation Chimera / Q000235:genetics / Q000378:metabolism
chemical_list: D000903:Antibiotics, Antineoplastic; D053590:Interleukin 1 Receptor Antagonist Protein; D053583:Interleukin-1beta; D016209:Interleukin-8; D008222:Lymphokines; C507780:Myd88 protein, mouse; D053594:Myeloid Differentiation Factor 88; D053573:Receptors, Interleukin-1 Type I; D011994:Recombinant Proteins; D012795:Sialoglycoproteins; C018997:lymphotactin; D001761:Bleomycin