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Published on: October 18, 2016
Interleukin-10 differentially regulates B7-1 (CD80) and B7-2 (CD86) expression on human peripheral blood dendritic
C Buelens1, F Willems, A Delvaux
1Department of Immunology, Hôpital Erasme, Université Libre de Bruxelles, Belgium.
European Journal of Immunology
|September 1, 1995
Summary
Recombinant interleukin-10 (IL-10) suppresses T cell responses by directly inhibiting human dendritic cells (DC). This cytokine down-regulates key molecules on DC, impairing their ability to stimulate T cells effectively.
Area of Science:
- Immunology
- Cell Biology
Background:
- Interleukin-10 (IL-10) is a key immunosuppressive cytokine.
- Its effects are largely mediated through the functional inhibition of antigen-presenting cells (APC).
Purpose of the Study:
- To investigate the specific influence of recombinant IL-10 (rIL-10) on human dendritic cells (DC).
- To elucidate the mechanisms by which rIL-10 affects DC function and T cell activation.
Main Methods:
- Purification of human dendritic cells (DC) from peripheral blood of healthy volunteers.
- Mixed lymphocyte reaction (MLR) assays involving purified T cells and DC.
- Flow cytometric analysis to assess surface marker expression on DC.
Main Results:
- rIL-10 dose-dependently inhibited T cell proliferation and production of IL-2 and IFN-gamma in MLR.
- Pre-incubation of DC with rIL-10 rendered them deficient in inducing alloreactive T cells.
- rIL-10 decreased HLA-DR and B7-2 (CD86) expression on DC, while ICAM-1 and B7-1 expression remained unchanged.
Conclusions:
- The immunosuppressive effects of rIL-10 on primary alloreactive T cell responses are mediated by direct action on DC.
- Down-regulation of MHC class II and B7-2 expression on DC surface is a key mechanism for rIL-10-induced T cell inhibition.
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