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in Endotoxin-Stimulated Human Monocytes

Departments of *Anesthesiology and Critical Care Medicine and
Cardiac and Thoracic Surgery, Martin Luther University Halle, Germany
Address correspondence and reprint requests to Elke Czeslick, MD, Department of Anesthesiology and Critical Care Medicine, Martin Luther University Halle, Ernst-Grube-Str. 40, 06120 Halle/Saale, Germany. Address e-mail to elke.czeslick{at}medizin.uni-halle.de.
In this ex vivo laboratory study, we investigated the effects of drotrecogin alfa (activated) (DA(a)), a recombinant form of human activated protein C, on the intracellular expression of interleukin (IL)-6 and tumor necrosis factor (TNF)-
on lipopolysaccharide (LPS)-stimulated human monocytes in a whole blood system. Whole blood samples from 10 healthy volunteers were stimulated with LPS (0.2 ng/mL) and incubated with 0.01, 0.1, 1, 10, and 100 nM of (final concentration) DA(a) for 3 h at 37°C and 5% CO2. Intracellular expression of IL-6 and TNF-
was assessed by flow cytometry. Our investigation showed that DA(a), at any of the concentrations tested, did not affect intracellular IL-6 and TNF-
production in LPS-stimulated human monocytes after 3 h of incubation. The results of this investigation led us to conclude that any antiinflammatory activity of DA(a), if present, does not occur via detectible decreases in the production of proinflammatory cytokines IL-6 and TNF-
in human monocytes.
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H. F. Galley, N. E. El Sakka, N. R. Webster, D. A. Lowes, and B. H. Cuthbertson Activated protein C inhibits chemotaxis and interleukin-6 release by human neutrophils without affecting other neutrophil functions Br. J. Anaesth., June 1, 2008; 100(6): 815 - 819. [Abstract] [Full Text] [PDF] |
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