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© Charles DAUGUET, Institut Pasteur
HIV particles
Publication : International journal of experimental pathology

Toll-like receptor and tumour necrosis factor dependent endotoxin-induced acute lung injury

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in International journal of experimental pathology - 01 Dec 2007

Togbe D, Schnyder-Candrian S, Schnyder B, Doz E, Noulin N, Janot L, Secher T, Gasse P, Lima C, Coelho FR, Vasseur V, Erard F, Ryffel B, Couillin I, Moser R

Link to Pubmed [PMID] – 18039275

Int J Exp Pathol 2007 Dec;88(6):387-91

Recent studies on endotoxin/lipopolysaccharide (LPS)-induced acute inflammatory response in the lung are reviewed. The acute airway inflammatory response to inhaled endotoxin is mediated through Toll-like receptor 4 (TLR4) and CD14 signalling as mice deficient for TLR4 or CD14 are unresponsive to endotoxin. Acute bronchoconstriction, tumour necrosis factor (TNF), interleukin (IL)-12 and keratinocyte-derived chemokine (KC) production, protein leak and neutrophil recruitment in the lung are abrogated in mice deficient for the adaptor molecules myeloid differentiation factor 88 (MyD88) and Toll/Interleukin-1 receptor (TIR)-domain-containing adaptor protein (TIRAP), but independent of TIR-domain-containing adaptor-inducing interferon-beta (TRIF). In particular, LPS-induced TNF is required for bronchoconstriction, but dispensable for inflammatory cell recruitment. Lipopolysaccharide induces activation of the p38 mitogen-activated protein kinase (MAPK). Inhibition of pulmonary MAPK activity abrogates LPS-induced TNF production, bronchoconstriction, neutrophil recruitment into the lungs and broncho-alveolar space. In conclusion, TLR4-mediated, bronchoconstriction and acute inflammatory lung pathology to inhaled endotoxin are dependent on TLR4/CD14/MD2 expression using the adapter proteins TIRAP and MyD88, while TRIF, IL-1R1 or IL-18R signalling pathways are dispensable. Further downstream in this axis of signalling, TNF blockade reduces only acute bronchoconstriction, while MAPK inhibition abrogates completely endotoxin-induced inflammation.

http://www.ncbi.nlm.nih.gov/pubmed/18039275