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Increased in vitro and in vivo generation of procoagulant activity (tissue factor) by mononuclear phagocytes after intralipid infusion in rabbits

P Montemurro, A Lattanzio, G Chetta, L Lupo, L Caputi-Iambrenghi, M Rubino, D Giordano and N Semeraro

Intralipid, a fat emulsion widely used in parenteral nutrition, can produce marked functional changes of the mononuclear phagocyte system. We investigated the effect of Intralipid administration on the generation of procoagulant activity by rabbit mononuclear phagocytes. Two groups of ten rabbits given either a single infusion of Intralipid 10% or a similar volume of sterile saline were studied before and after infusion. Procoagulant activity was measured on isolated blood mononuclear cells after incubation with and without endotoxin, using a one-stage clotting assay. Cells from animals infused with Intralipid produced significantly more procoagulant activity than controls (P less than .01). Results were similar when freshly collected whole blood was incubated with and without endotoxin, and procoagulant activity was measured on subsequently isolated mononuclear cells (P less than .01). In addition, when rabbits were given a single injection of endotoxin, blood and spleen mononuclear cells harvested 50 to 60 minutes after the injection from animals pretreated with Intralipid expressed five to seven times more procoagulant activity than did cells from animals pretreated with saline. In all instances, procoagulant activity was identified as tissue factor. These findings suggest that Intralipid may cause functional changes in mononuclear phagocytes, resulting in increased production of tissue factor on incubation in short-term culture in vitro and in response to endotoxin in vivo.

Volume 65, Issue 6, pp. 1391-1395, 06/01/1985
Copyright © 1985 by The American Society of Hematology


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  Copyright © 1985 by American Society of Hematology         Online ISSN: 1528-0020