Inhibition of endothelial receptor expression and of T-cell ligand activity by mycophenolate mofetil
| Autor: | Elsie Oppermann, Roman A. Blaheta, Martin Scholz, Bernd H. Markus, Sebastian Harder, Bianca Wittig, Dietmar Zenker, S. Weber, K. Leckel, Albrecht Encke, Horst Schuldes |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
CD4-Positive T-Lymphocytes
Integrins Receptor expression Immunology Intercellular Adhesion Molecule-1 Receptors Lymphocyte Homing Lewis X Antigen Oligosaccharides Vascular Cell Adhesion Molecule-1 Biology CD8-Positive T-Lymphocytes Integrin alpha4beta1 Mycophenolate Ligands IMP Dehydrogenase Immunology and Allergy Humans Receptor Cell adhesion Sialyl Lewis X Antigen Cells Cultured Transplantation Membrane Glycoproteins Cell adhesion molecule Mycophenolic Acid Lymphocyte Function-Associated Antigen-1 Cell biology Endothelial stem cell P-Selectin Neural cell adhesion molecule Endothelium Vascular E-Selectin Cell Adhesion Molecules Immunosuppressive Agents |
| Zdroj: | Transplant immunology. 6(4) |
| ISSN: | 0966-3274 |
| Popis: | The novel immunosuppressive drug mycophenolate mofetil (CelICept®, MMF) blocks DNA-synthesis by the inhibition of the enzyme inosine monophosphate dehydrogenase (IMDH). IMDH is also involved in the synthesis of adhesion receptors which are known to play an important role in the regulation of cell-cell contacts. Therefore, application of MMF mightlead to a reduction of cellular infiltrates in the course of transplant rejection. To evaluate the therapeutic value of MMF, we investigated to what extent MMF blocks T-lymphocyte infiltration in vivo with regard to (a) adhesion to endothelial cells, (b) horizontal migration along these cells and (c) penetration through the endothelial cells. The results demonstrated a strong inhibition of both CD4+ and CD8+ T-cell adhesion and penetration by MMF. The ID50 value for CD4+ T-cell adhesion was calculated to be 0.03 μM and the ID50 value for CD4+ T-cell penetration 1.21 μM. MMF did not significantly influence the horizontal migration of T-lymphocytes along the human vascular endothelial cell (HUVEC) borders. FACS-analysis revealed a diminished E-selectin and P-selectin expression on endothelial cell membranes in the presence of the MMF. Although MMF did not interfere with the synthesis of T-cell adhesion ligands, the binding activity of lymphocytic leucocyte function associated antigen 1 (LFA-1), very late antigen 4 (VLA-4) and PSGL-1 (P-selectin glycoprotein ligand 1) to immobilized intercellular adhesion molecule 1 (ICAM-1), vascular cell adhesion molecule 1 (VCAM-1) and P-selectin was impaired. Moreover, MMF prevented VLA-4 and PSGL-1 receptor accumulation on the membranes of T-cell pseudopodia. It can be concluded that MMF possesses potent infiltration blocking properties. MMF evoked down-regulation of specific endothelial membrane molecules and the loss of protein localization in the lymphocyte protrusions might be predominantly responsible for the observed blockade of cell adhesion and penetration. |
| Databáze: | OpenAIRE |
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