Cytotoxic T lymphocyte antigen‐4‐dependent down‐modulation of costimulatory molecules on dendritic cells in CD4+ CD25+ regulatory T‐cell‐mediated suppression
Summary We have previously demonstrated that CD4+ CD25+ natural regulatory T cells (Treg cells) induce down‐modulation of CD80 and CD86 (B7) molecules on dendritic cells (DCs) in vitro. In this report we show that the extent of down‐modulation is functionally significant because Treg‐cell conditione...
Saved in:
Published in | Immunology Vol. 118; no. 2; pp. 240 - 249 |
---|---|
Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Oxford, UK
Blackwell Publishing Ltd
01.06.2006
Blackwell Science Inc |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Summary
We have previously demonstrated that CD4+ CD25+ natural regulatory T cells (Treg cells) induce down‐modulation of CD80 and CD86 (B7) molecules on dendritic cells (DCs) in vitro. In this report we show that the extent of down‐modulation is functionally significant because Treg‐cell conditioned DCs induced poor T‐cell proliferation responses. Further, we report that down‐modulation was induced rapidly and was inhibited by blocking cytotoxic T lymphocyte antigen‐4 (CTLA‐4), which is constitutively expressed by the Treg cells. Even though Treg cells have previously been reported to kill antigen‐presenting cells, the down‐modulation was not due to selective killing of DCs expressing high level of the costimulatory molecules. We propose that Treg cells down‐modulate B7‐molecules on DCs in a CTLA‐4‐dependent way, thereby enhancing suppression of T‐cell activity. |
---|---|
Bibliography: | These two authors contributed equally to this study. Present address: Department of Neuroimmunology, Guy's, King's and St Thomas' Schools of Medicine, King's College, London, SE1 1UL, UK. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0019-2805 1365-2567 |
DOI: | 10.1111/j.1365-2567.2006.02362.x |