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A Leukocyte Elastase Inhibitor Reduces Thrombin-Induced Pulmonary Oedema in the Rat: Mechanisms of Action

Authors
 C.M. Ahn  ;  H. Sandler  ;  T. Saldeen 
Citation
 PULMONARY PHARMACOLOGY & THERAPEUTICS, Vol.11(4) : 291-299, 1998 
Journal Title
 PULMONARY PHARMACOLOGY & THERAPEUTICS 
ISSN
 1094-5539 
Issue Date
1998
MeSH
Animals ; Capillary Permeability/drug effects ; Disease Models, Animal ; Dose-Response Relationship, Drug ; Extracellular Matrix/pathology ; Leukocyte Elastase/antagonists & inhibitors* ; Lung/drug effects ; Lung/enzymology ; Lung/pathology ; Male ; Oligopeptides/pharmacology* ; Oligopeptides/therapeutic use ; Peroxidase/metabolism ; Pulmonary Edema/enzymology ; Pulmonary Edema/pathology ; Pulmonary Edema/prevention & control* ; Rats ; Rats, Sprague-Dawley ; Respiratory Distress Syndrome, Adult/enzymology ; Respiratory Distress Syndrome, Adult/pathology ; Respiratory Distress Syndrome, Adult/prevention & control* ; Serine Proteinase Inhibitors/pharmacology* ; Serine Proteinase Inhibitors/therapeutic use ; Thrombin
Abstract
The effect of a selective leukocyte elastase inhibitor, ICI 200,355, on thrombin-induced pulmonary oedema was studied in rats. Thrombin administration produced an increase in lung weight (P<0.05), wet weight/dry weight ratio (P<0.05), and relative lung water content (P<0.05). The lung weight increase was reduced by the elastase inhibitor in doses of 2000, 200 and 20 μg/kg per h (P<0.05), but not by 2 μg/kg per h. A dose of 20 μg/kg per h seems to be optimal, since 10-fold and 100-fold increases in dose did not further improve the effect. Free elastase activity in lung tissue was higher after thrombin infusion than in controls, but was not depleted by the elastase inhibitor in vivo (P<0.05). This elastase activity in the lung was, however, inhibited by the elastase inhibitor in vitro, indicating that the inhibitor can block extracellular, but not intracellular elastase activity. Thrombin infusion resulted in a significant decrease in plasma elastase inhibitory capacity (P<0.05), which was depleted by the elastase inhibitor (20 μg/kg per h) (P<0.05). Myeloperoxidase activity was significantly increased in lung tissue after thrombin infusion (P<0.05). Lung myeloperoxidase activity 5 min after thrombin infusion was not affected by the elastase inhibitor, but the inhibitor induced a further increase in myeloperoxidase as seen 90 min after thrombin infusion, indicating that the effect of this inhibitor on pulmonary oedema is not due to reduction of leukocyte infiltration in the lungs, but may partly be exerted by prevention of neutrophil destruction.
Full Text
http://www.sciencedirect.com/science/article/pii/S1094553998999990
DOI
10.1006/pupt.1998.9999
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
Yonsei Authors
Ahn, Chul Min(안철민)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/176736
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