TY - JOUR
T1 - Mechanisms of cytokine cascade activation in patients with sepsis
T2 - Normal cytokine transcription despite reduced CD14 receptor expression
AU - Ertel, W.
AU - Krombach, F.
AU - Kremer, J. P.
AU - Jarrar, D.
AU - Thiele, V.
AU - Eymann, J.
AU - Muenzing, S.
AU - Faist, E.
AU - Messmer, K.
AU - Schildberg, F. W.
AU - Buchman, T. G.
AU - Billiar, R. T.
AU - Rodeberg, D. A.
PY - 1993
Y1 - 1993
N2 - Background. Lipopolysaccharide causes activation of monocytes/macrophages with excessive secretion of cytokines resulting in hypotension and shock in patients with sepsis. Lipopolysaccharide may induce these responses by interacting with lipopolysaccharide-binding protein and then binding to the cell surface protein CD14 or by acting directly with CD11-CD18 on monocytes/macrophages. The role of CD14 and CD11-CD18 in the activation of macrophages with enhanced cytokine transcription in patients with septic shock remains to be determined. Methods. To study this, heparinized blood was obtained from 16 patients with septic shock on days 0, 1, 3, 5, 7, and 10 and compared with 20 control patients. The expression of CD14 and CD11b on monocytes in whole blood was measured by direct immunofluorescence and flow cytometry. Moreover, whole blood was stimulated with lipopolysaccharide (1 μg/ml) for 0, 1, 2, 4, 8, and 24 hours, and messenger RNA expression for tumor necrosis factor-α, interleukin-β (IL-1β), and IL-6 was determined on isolated peripheral blood mononuclear cells with Northern blot analysis. Results. Both CD14 expression and receptor density on monocytes from whole blood were markedly suppressed (-63% on day 3; p < 0.05) in the septic group compared with controls. Although CD11b expression was also decreased (-24% on day 1; p < 0.05), receptor density on monocytes was slightly increased in the septic group in comparison with the control group. Kinetics and intensity of messenger RNA expression for tumor necrosis factor-α, IL-1β, and IL-6 were similar in both groups. Conclusions. These data indicate that in patients with septic shock, lipopolysaccharide-mediated signaling and cytokine transcription are unchanged despite a significant reduction of CD14 expression and density on monocytes. Thus, lipopolysaccharide-induced activation of monocytes from patients with sepsis may occur through direct binding of lipopolysaccharide to the CD11-CD18 complex or other lipopolysaccharide receptors, whereas binding of the lipopolysaccharide- lipopolysaccharide-binding protein complex to the CD14 receptor may not play a pivotal role in sepsis.
AB - Background. Lipopolysaccharide causes activation of monocytes/macrophages with excessive secretion of cytokines resulting in hypotension and shock in patients with sepsis. Lipopolysaccharide may induce these responses by interacting with lipopolysaccharide-binding protein and then binding to the cell surface protein CD14 or by acting directly with CD11-CD18 on monocytes/macrophages. The role of CD14 and CD11-CD18 in the activation of macrophages with enhanced cytokine transcription in patients with septic shock remains to be determined. Methods. To study this, heparinized blood was obtained from 16 patients with septic shock on days 0, 1, 3, 5, 7, and 10 and compared with 20 control patients. The expression of CD14 and CD11b on monocytes in whole blood was measured by direct immunofluorescence and flow cytometry. Moreover, whole blood was stimulated with lipopolysaccharide (1 μg/ml) for 0, 1, 2, 4, 8, and 24 hours, and messenger RNA expression for tumor necrosis factor-α, interleukin-β (IL-1β), and IL-6 was determined on isolated peripheral blood mononuclear cells with Northern blot analysis. Results. Both CD14 expression and receptor density on monocytes from whole blood were markedly suppressed (-63% on day 3; p < 0.05) in the septic group compared with controls. Although CD11b expression was also decreased (-24% on day 1; p < 0.05), receptor density on monocytes was slightly increased in the septic group in comparison with the control group. Kinetics and intensity of messenger RNA expression for tumor necrosis factor-α, IL-1β, and IL-6 were similar in both groups. Conclusions. These data indicate that in patients with septic shock, lipopolysaccharide-mediated signaling and cytokine transcription are unchanged despite a significant reduction of CD14 expression and density on monocytes. Thus, lipopolysaccharide-induced activation of monocytes from patients with sepsis may occur through direct binding of lipopolysaccharide to the CD11-CD18 complex or other lipopolysaccharide receptors, whereas binding of the lipopolysaccharide- lipopolysaccharide-binding protein complex to the CD14 receptor may not play a pivotal role in sepsis.
UR - http://www.scopus.com/inward/record.url?scp=0027247686&partnerID=8YFLogxK
M3 - Article
C2 - 7688151
AN - SCOPUS:0027247686
SN - 0039-6060
VL - 114
SP - 243
EP - 251
JO - Surgery
JF - Surgery
IS - 2
ER -