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AJP - Lung Cellular and Molecular Physiology, Vol 273, Issue 4 889-L894, Copyright © 1997 by American Physiological Society
ARTICLES |
M. Uchiba, K. Okajima, K. Murakami, M. Johno, M. Mohri, H. Okabe and K. Takatsuki
Department of Medicine, Kumamoto University School of Medicine, Japan.
We have previously demonstrated that recombinant human soluble (rhs) thrombomodulin (TM) inhibits the endotoxin (ET)-induced increase in pulmonary vascular permeability by inhibiting leukocyte activation. In the present study, we examined whether rhs-TM could inhibit the ET-induced increase in pulmonary vascular permeability in rats by activating protein C. rhs-TM did not inhibit ET-induced increases in pulmonary vascular permeability when its protein C activation ability was selectively inhibited by a monoclonal antibody (MAb) against rhs-TM (MAb R5G12). Histological examination revealed that neutrophil infiltration in lung tissues after ET administration was significantly reduced by rhs-TM, but infiltration was not reduced by MAb R5G12-pretreated rhs-TM. ET-induced intravascular coagulation was prevented by rhs-TM and by MAb R5G12-pretreated rhs-TM. However, ET-induced coagulation was not prevented by rhs-TM that had been treated with MAb F2H5, which cannot bind thrombin or activate protein C. These observations strongly suggest that rhs-TM prevents ET-induced pulmonary vascular injury by inhibiting pulmonary accumulation of leukocytes through thrombin binding and the subsequent protein C activation and may prevent ET-induced intravascular coagulation through thrombin binding.
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