Decay-accelerating Factor Limits Hemorrhage-instigated Tissue Injury and Improves Resuscitation Clinical Parameters
ARMY INST OF SURGICAL RESEARCH FORT SAM HOUSTON TX
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Complement is invariably activated during trauma and contributes to tissue injury. Recombinant human decay-accelerating factor DAF, a complement regulatory protein that inhibits both classical and alternative pathways, improves survival and reduces tissue damage in animal models of tissue injury. The extent to which DAF may facilitate resuscitation in hemorrhaged large animals is not known. Male Yorkshire swine assigned to one of six groups were subjected to controlled, isobaric hemorrhage over 15 min to a target mean arterial pressure MAP of 35 mm Hg. Hypotension was maintained for 20 min followed by a bolus intravenous injection of DAF or vehicle followed by Hextend resuscitation. Animals were observed for 3 h after hypotensive Hextend resuscitation. Survival, blood chemistry, and physiological parameters were recorded. Additionally, tissue from lung, small intestine, liver, and kidney were subjected to histopathologic evaluation and tissue deposition of complement- ment proteins was determined by immunohistochemistry, dot-blot, and Western blot analyses.
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