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Absence of proteinase-activated receptor-1 signaling affords protection from bleomycin-induced lung inflammation and fibrosis

Howell, DCJ; Johns, RH; Lasky, JA; Shan, B; Scotton, CJ; Laurent, GJ; Chambers, RC; (2005) Absence of proteinase-activated receptor-1 signaling affords protection from bleomycin-induced lung inflammation and fibrosis. AM J PATHOL , 166 (5) 1353 - 1365. Gold open access

Abstract

Activation of the coagulation cascade is commonly observed in the lungs of patients with both acute and chronic inflammatory and fibrotic lung disorders, as well as in animal models of these disorders. The aim of this study was to examine the contribution of the major thrombin receptor, proteinase-activated receptor-1 (PAR-1), during the acute inflammatory and chronic fibrotic phases of lung injury induced by intratracheal instillation of bleomycin in mice. inflammatory cell recruitment and increases in bronchoalveolar lavage fluid (BALF) protein were attenuated oby 56 +/- 10% (P < 0.05) and 53 +/- 12% (P < 0.05), respectively, in PAR-1-deficient (PAR-1(-/-)) mice compared with wild-type (WT) mice. PAR-1(-/-) mice were also protected from bleomycin-induced pulmonary fibrosis with total lung collagen accumulation reduced by 59 +/- 5% (P < 0.05). The protection afforded by PAR-I deficiency was accompanied by significant reductions in pulmonary levels of the potent PAR-1inducible proinflammatory and profibrotic mediators, monocyte chemoattractant protein-1 (MCP-1), transforming growth factor-beta-1 (TGF-beta(1)), and connective tissue growth factor/fibroblast-inducible secreted protein-12 (CTGF/FISP12). In addition, PARA was highly expressed in inflammatory and fibroproliferative lesions in lung sections obtained from patients with fibrotic lung disease. These data show for the first time that PAR-1 signaling plays a key role in experimentally induced lung injury, and they further identify PAR-1 as one of the critical receptors involved in orchestrating the interplay between coagulation, inflammation, and remodeling in response to tissue injury.

Type: Article
Title: Absence of proteinase-activated receptor-1 signaling affords protection from bleomycin-induced lung inflammation and fibrosis
Identifier: PMID: 15855637
Open access status: An open access publication
Publisher version: http://www.ncbi.nlm.nih.gov/pmc/ articles/PMC16063...
Keywords: INDUCED PULMONARY-FIBROSIS, TISSUE GROWTH-FACTOR, THROMBIN STIMULATES PRODUCTION, MONOCYTE CHEMOATTRACTANT PROTEIN-1, FIBROBLAST PROCOLLAGEN PRODUCTION, RESPIRATORY-DISTRESS SYNDROME, VEIN ENDOTHELIAL-CELLS, SMOOTH-MUSCLE-CELLS, FACTOR-BETA, EPITHELIAL-CELLS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Medicine
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Medicine > Respiratory Medicine
URI: http://discovery.ucl.ac.uk/id/eprint/8690
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