Antithrombin reduces mesenteric venular leukocyte interactions and small intestine injury in endotoxemic rats.
We examined the hypothesis that recombinant human antithrombin would reduce mesenteric venule leukocyte adhesion and small intestine injury in endotoxemic rats. Endotoxemic (endotoxin 10 mg/kg, intravenously) rats were treated either with saline or recombinant human antithrombin (250 and 500 U/kg). In some rats, indomethacin (100 mg/kg, intraperitoneally) was injected 60 min prior to endotoxin and recominant human antithrombin (500 U/kg) treatment. Compared to controls, intravital videomicroscopy of the mesentric venule showed an increase of leukocyte rolling (55+/-17 versus 70+/-19 leukocytes/min; P < 0.05) and firm adhesion (1.1+/-0.3 versus 5.8+/-0.8 leukocytes/100 microm; P < 0.05) in endotoxemic rats. Recombinant human antithrombin attenuated endotoxin-induced venular endothelium leukocyte adhesive cascade. The beneficial effects of recombinant human antithrombin on leukocyte adhesion were inhibited by indomethacin (100 mg/kg, intraperitoneally) in endotoxemic rats. Endotoxin treatment increased fluorescein isothiocyanate (FITC)-labeled dextran 4,000 (FD4) gut lumen to plasma ratio and wet weight/dry weight ratio. Recombinant human antithrombin (500 U/kg) attenuated endotoxin-induced gut injury. These observations suggest that recombinant human antithrombin reduces endothelium-leukocyte interactions in endotoxemic rats by interacting with local prostacyclin production.
Groupe de Recherche INSERM EA 2689, Pr Chopin Claude, Centre Hospitalier et Universitaire de Lille et Université de Lille 2, France.
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Nevière
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Tournoys
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Mordon
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Maréchal
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Song
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Jourdain
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Fourrier
D000818:Animals; D000990:Antithrombin III / Q000494:pharmacology*; D001777:Blood Coagulation / Q000187:drug effects; D002448:Cell Adhesion / Q000187:drug effects; D004730:Endothelium, Vascular / Q000187:drug effects*; D019446:Endotoxemia / Q000473:pathology* / Q000503:physiopathology; D004731:Endotoxins / Q000494:pharmacology; D005342:Fibrinolysis / Q000187:drug effects; D006801:Humans; D007413:Intestinal Mucosa / Q000187:drug effects; D007421:Intestine, Small / Q000187:drug effects / Q000473:pathology* / Q000503:physiopathology; D007962:Leukocytes / Q000187:drug effects*; D008642:Mesenteric Veins / Q000187:drug effects*; D051381:Rats; D017207:Rats, Sprague-Dawley; D011994:Recombinant Proteins / Q000494:pharmacology; D014699:Venules / Q000187:drug effects
D004731:Endotoxins; D011994:Recombinant Proteins; D000990:Antithrombin III