Research Project
Grant-in-Aid for Scientific Research (C)
Background: Protein S (PS) and activated protein C (APC) have anticoagulant and anti-inflammatory activities. PS may exert anticoagulant activity by favoring the anticoagulant activity of APC and/or by directly inhibiting the prothrombinase complex. The role of PS and the combination of PS and APC on acute lung injury have not been as yet appraised.Objective : The aim of this present study was to evaluate the effect of PS and APC plus PS on acute lung injury in the mouse.Methods : Acute lung injury was induced in C57/BL6 mice by intratracheal instillation of lipopolysaccharide(LPS)(5mg/kg). Mice treated with saline served as controls. To evaluate the therapeutic effect of PS and APC plus PS, the animals were treated with PS alone, a combination of PS and APC or saline by intraperitoneal injection one hour before LPS instillation. These animals were sacrificed 24 hours after LPS injection and sampling of bronchoalveolar lavage fluid and lung tissue were performed. The in vitro effect of PS on secretion of inflammatory cytokines from alveolar epithelial cells was also assessed.Results : The total cell count and the bronchoalveolar lavage fluid level of total protein, interleukin-6 and monocyte chemoattractant protein-1 were significantly increased in LPS-treated mice compared with controls. Mice with acute lung injury treated with PS and combined therapy of PS plus APC had significantly decreased concentration of interleukin-6 and monocyte chemoattractant protein-1 in bronchoalveolar lavage fluid as compared to untreated animals. Treatment with protein C pathway factors also improved lung pathological changes. PS alone significantly abated the expression of inflammatory cytokines from alveolar epithelial cells.Conclusions : These results suggest that combined administration of protein C pathway factors may be a potential therapeutic strategy for the therapy of acute lung injury.
All 2008 2007 2006
All Journal Article (15 results) (of which Peer Reviewed: 6 results) Presentation (7 results) Book (1 results)
Biochem Biophys Res Commun 368
Pages: 116-120
J Thromb Haemost 6
Pages: 139-146
Pages: 116-20
Pages: 139-46
Am J Respir Crit Care Med 176
Pages: 1251-1260
Pages: 1251-60
Eur J Immunol 36
Pages: 3334-33345
J Thromb Haemost 4
Pages: 2331-2339
Pages: 3334-45
Pages: 2331-9
Journal of Thrombosis and Haemostasis 4・11
Scandinavian Journal of Gastroenterology 41・3
Pages: 331-337
Journal of Thrombosis and Haemostasis 4・8
Pages: 1763-1773
European Journal of Immunology 36・12
Pages: 3334-3345