scholarly journals Synthetic Colloids Attenuate Leukocyte-Endothelial Interactions by Inhibition of Integrin Function

2005 ◽  
Vol 103 (4) ◽  
pp. 759-767 ◽  
Author(s):  
Boris Nohé ◽  
Tanja Johannes ◽  
Jörg Reutershan ◽  
Albert Rothmund ◽  
Helene A. Haeberle ◽  
...  
Keyword(s):  
Cell Adhesion ◽  
Endothelial Cell ◽  
Adhesion Molecule ◽  
Cell Activation ◽  
Tissue Injury ◽  
Severe Infection ◽  
Intercellular Adhesion Molecule ◽  
Neutrophil Adhesion ◽  
Intercellular Adhesion Molecule 1 ◽  
Endothelial Cell Activation

Background It has been suspected that synthetic colloids may interfere with leukocyte adhesion by down-regulation of endothelial cell adhesion molecules. Although inhibition of endothelial inflammation might reduce leukocyte-related tissue injury, the same mechanism may be detrimental for host defense during severe infection. Regarding the widespread use of colloids, the authors performed a laboratory investigation to determine the mechanisms by which synthetic colloids interfere with leukocyte-endothelial interactions. Methods Adhesion molecule expression on native and cytokine-activated endothelium from umbilical veins was measured after pretreatment with gelatin and various preparations of dextran or hydroxyethyl starch. Inhibition of neutrophil adhesion to activated endothelium was examined in a flow chamber by perfusion of untreated and colloid-treated neutrophils over colloid-pretreated endothelium at 2 dyn/cm. Comparisons were made between untreated controls, colloid-pretreated endothelium, and colloid-cotreated neutrophils. Results Intercellular adhesion molecule 1, vascular cell adhesion molecule 1, E-selectin, and P-selectin were not attenuated by any colloid. Accordingly, colloid pretreatment of endothelium alone did not reduce neutrophil adhesion. In contrast, when neutrophils were cotreated by addition of colloids to the perfusate immediately before perfusion, adhesion decreased by 31-51% (P < 0.05) regardless of the colloid type. As indicated by the twofold increased rolling fractions, this reduction was due to an inhibition of neutrophil integrins. Conclusions This study shows that synthetic colloids inhibit neutrophil adhesion by a neutrophil-dependent mechanism rather than interfering with endothelial cell activation. This suggests that inhibition of leukocyte sequestration by volume support is a common and transient phenomenon depending on the colloid concentration in plasma.

pH dependence of neutrophil-endothelial cell adhesion and adhesion molecule expression

1996 ◽  
Vol 271 (3) ◽  
pp. C962-C970 ◽  
Author(s):  
C. V. Serrano ◽  
A. Fraticelli ◽  
R. Paniccia ◽  
A. Teti ◽  
B. Noble ◽  
...  
Keyword(s):  
Cell Adhesion ◽  
Endothelial Cell ◽  
Adhesion Molecule ◽  
Ph Dependence ◽  
Intercellular Adhesion Molecule ◽  
Tnf Alpha ◽  
Neutrophil Adhesion ◽  
Human Aortic Endothelial Cell ◽  
Necrosis Factor Alpha ◽  
Tissue Ischemia

Neutrophil adhesion to the vascular endothelium is enhanced during tissue ischemia and/or inflammation, conditions that are associated with tissue acidosis. This study examined the effects of hypercarbic acidosis (10 or 20% CO2) and of hypocarbic alkalosis (0% CO2) on human neutrophil CD18 and human aortic endothelial cell intercellular adhesion molecule-1 (ICAM-1), vascular cell adhesion molecule-1 (VCAM-1), and E-selectin expression quantified by flow cytometry. Acidosis with 20% CO2 for 4 h decreased ICAM-1 to 60.6 +/- 9.7% of control. In contrast, alkalosis with 0% CO2 for 4 h enhanced ICAM-1 expression to 143.8 +/- 10.1% of control. There was no pH dependence of VCAM-1 or E-selectin expression. Tumor necrosis factor-alpha (TNF-alpha; 10 ng/ml) increased endothelial ICAM-1, E-selectin, and VCAM-1; under these conditions, acidosis with 20% CO2 blunted both ICAM-1 and E-selectin surface expression compared with 5% CO2-, TNF-alpha-treated cells. Hypercarbic acidosis with 20% CO2 increased neutrophil CD18 expression and enhanced neutrophil adhesion. This latter effect was inhibited by neutrophil pretreatment with an anti-CD18 monoclonal antibody. In contrast, when only endothelial cells were preincubated with the hypercarbic buffer, neutrophil adhesion diminished to 55.6 +/- 7.8% of control. The results suggest that acidosis generated during tissue ischemia/inflammation may induce CD18-mediated neutrophil adhesion despite a decrease in ICAM-1 expression.

Role of endothelial nitric oxide synthase in endothelial activation: insights from eNOS knockout endothelial cells

2004 ◽  
Vol 286 (5) ◽  
pp. C1195-C1202 ◽  
Author(s):  
Peter J. Kuhlencordt ◽  
Eva Rosel ◽  
Robert E. Gerszten ◽  
Manuel Morales-Ruiz ◽  
David Dombkowski ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Cell Adhesion ◽  
Endothelial Cell ◽  
Adhesion Molecule ◽  
Cell Adhesion Molecule ◽  
Cell Activation ◽  
Cell Interactions ◽  
Wild Type ◽  
Endothelial Cell Activation ◽  
Endothelial Nitric Oxide

The objective of this study was to determine whether absence of endothelial nitric oxide synthase (eNOS) affects the expression of cell surface adhesion molecules in endothelial cells. Murine lung endothelial cells (MLECs) were prepared by immunomagnetic bead selection from wild-type and eNOS knockout mice. Wild-type cells expressed eNOS, but eNOS knockout cells did not. Expression of neuronal NOS and inducible NOS was not detectable in cells of either genotype. Upon stimulation, confluent wild-type MLECs produced significant amounts of NO compared with Nω-monomethyl-l-arginine-treated wild-type cells. eNOS knockout and wild-type cells showed no difference in the expression of E-selectin, P-selectin, intracellular adhesion molecule-1, and vascular cell adhesion molecule-1 as measured by flow cytometry on the surface of platelet endothelial cell adhesion molecule-1 (PECAM-1/CD31)-positive cells. Both eNOS knockout and wild-type cells displayed the characteristics of resting endothelium. Adhesion studies in a parallel plate laminar flow chamber showed no difference in leukocyte-endothelial cell interactions between the two genotypes. Cytokine treatment induced endothelial cell adhesion molecule expression and increased leukocyte-endothelial cell interactions in both genotypes. We conclude that in resting murine endothelial cells, absence of endothelial production of NO by itself does not initiate endothelial cell activation or promote leukocyte-endothelial cell interactions. We propose that eNOS derived NO does not chronically suppress endothelial cell activation in an autocrine fashion but serves to counterbalance signals that mediate activation.

Circulating Endothelial Cell/Leukocyte Adhesion Molecules in Atherosclerosis

1994 ◽  
Vol 72 (01) ◽  
pp. 151-154 ◽  
Author(s):  
Andrew D Blann ◽  
Charles N McCollum
Keyword(s):  
Endothelial Cell ◽  
Adhesion Molecules ◽  
Adhesion Molecule ◽  
Cell Activation ◽  
Leukocyte Adhesion ◽  
Clinical Manifestations ◽  
Intercellular Adhesion Molecule ◽  
Endothelial Cell Activation ◽  
Soluble Adhesion Molecules ◽  
Von Willebrand

SummarySoluble adhesion molecules E-selectin, intercellular adhesion molecule (sICAM) and vascular cell adhesion molecule (sVCAM) were measured alongside von Willebrand factor (vWf) in 40 patients with peripheral vascular disease (PVD), 43 with ischaemic heart disease (IHD) and in equal numbers of age and sex matched asymptomatic controls. Increased vWf was found in patients with IHD (p = 0.0008) and in patients with PVD (p = 0.0001) relative to their respective controls but levels did not differ between the two patient groups. Raised sICAM was found in both PVD (p = 0.0003) and IHD (p = 0.0059) compared to their respective controls and was higher in PVD than in IHD (p = 0.0088). In the subjects taken as a whole, there was no correlation between vWf and sICAM. Levels of soluble E-sel-ectin and sVCAM did not differ in patients or controls. These data suggest that soluble ICAM may be useful as an index of endothelial cell activation in clinical manifestations of atherosclerosis.

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