Table of Contents
ISRN Pharmacology
Volume 2011 (2011), Article ID 347134, 4 pages
http://dx.doi.org/10.5402/2011/347134
Review Article

Dendritic Cell-Based Graft Tolerance

Laboratory of Environnemental Immuno-Microbiology and Cancerogenesis (IMEC Unit), Department of Biology, Faculty of Sciences of Bizerte, Zarzouna 7021, Tunisia

Received 12 January 2011; Accepted 7 February 2011

Academic Editor: Y. L. Hsu

Copyright © 2011 Mnasria Kaouther and Oueslati Ridha. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

It has recently been demonstrated that mouse and human dendritic cells (DCs) can produce IL-2 after activation. However the role of the IL2/IL2R pathway in DC functions has not yet been fully elucidated. The results presented in this study provide several new insights into the role of this pathway in DCs. We report that stimulation of human monocyte-derived DCs with LPS strongly upregulated CD25 (α chain of the IL2R) expression. In additon, by using a humanized monoclonal antibody against CD25, we demonstrated that the IL2 signalling in DC upregulated both IL-12 and γIFN production but decreased IL10 synthesis. We also found that LPS-matured DCs produced IL2. Taken together, these results suggest that IL-2 actively contributes to the DC activation through an autocrine pathway. Furthermore, our results indicate that the IL2 pathway in DC is involved in the development of T-helper priming ability and in the upregulation of surface markers characteristic of a “mature” phenotype. This study therefore provide new molecular clues regarding the split between these two phenomena and unravel new mechanisms of action of anti-CD25 monoclonal antibodies that may contribute to their action in several human immunological disorders such as autoimmune diseases and acute allograft rejection.