The effects of Castanospermine, an oligosaccharide processing inhibitor, on mononuclear/endothelial cell binding and the expression of cell adhesion molecules
Date
2012
Authors
Hibberd, Adrian D.
Trevillian, Paul R
Clark, David A.
McElDuff, Patrick
Cowden, William
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Elsevier
Abstract
Introduction: In this study we aimed to determine whether Castanospermine, a transplant immunosuppressive agent, impaired mononuclear/endothelial cell binding and expression of their cell adhesion molecules. Methods: The binding of human umbilical vein endothelial cells with peripheral blood mononuclear cells was measured by a binding assay using Chromium 51 label; the membrane expression of cell adhesion molecules was measured by flow cytometry expressed as mean fluorescence intensity ratios. Results: Castanospermine decreased mononuclear/endothelial cell binding if and only if both cell types were treated with Castanospermine: this impairment occurred if endothelial cells were treated with a range of doses of Castanospermine and mononuclear cells were treated with a constant dose of Castanospermine (p < 0.001 versus untreated p = 0.978) or vice versa (p = 0.004 versus untreated p = 0.582). Upon human umbilical vein endothelial cells Castanospermine reduced the mean fluorescence intensity ratios of E-selectin (p = 0.003), ICAM-1 (p < 0.001), ICAM-2 (p = 0.004) and PECAM-1 (p < 0.001) but increased it for P-selectin (p < 0.001). Upon peripheral blood mononuclear cells Castanospermine reduced the mean fluorescence intensity ratios of L-selectin (P < 0.001), LFA-1α (p < 0.001), VLA-4 (p < 0.001), Mac-1 (P < 0.001) and CR4 (p < 0.001) but increased the mean fluorescence intensity ratios of PSGL-1 (p < 0.001) and PECAM-1 (p = 0.001). Similar changes in mean fluorescence intensity ratios were found in the subset of lymphocytes and monocytes but the reductions in LFA-1α and VLA-4 on lymphocytes and Mac-1 and CR4 on monocytes were greater. Conclusions: The reduction in mononuclear/endothelial cell binding mediated by CAST and the reduction in expression of multiple cell adhesion molecules on these cell types help to explain the mechanism of its established immunosuppressive effect.
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Keywords: castanospermine; CD11b antigen; CD31 antigen; cell adhesion molecule; endothelial leukocyte adhesion molecule 1; intercellular adhesion molecule 2; L selectin; lymphocyte function associated antigen 1 alpha protein; oligosaccharide; PADGEM protein; unclas Castanospermine; Cell adhesion molecules; Mononuclear/endothelial cell binding
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Transplant Immunology
Type
Journal article
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2037-12-31
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