Academic Journal
Regulatory T Cell–Dependent and –Independent Mechanisms of Immune Suppression by CD28/B7 and CD40/CD40L Costimulation Blockade
| العنوان: | Regulatory T Cell–Dependent and –Independent Mechanisms of Immune Suppression by CD28/B7 and CD40/CD40L Costimulation Blockade |
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| المؤلفون: | Vogel, Isabel, Verbinnen, Bert, Van Gool, Stefaan, Ceuppens, Jan L. |
| المصدر: | The Journal of Immunology ; volume 197, issue 2, page 533-540 ; ISSN 0022-1767 1550-6606 |
| بيانات النشر: | Oxford University Press (OUP) |
| سنة النشر: | 2016 |
| الوصف: | Blocking of costimulatory CD28/B7 and CD40/CD40L interactions is an experimental approach to immune suppression and tolerance induction. We previously reported that administration of a combination of CTLA-4Ig and MR1 (anti-CD40L mAb) for blockade of these interactions induces tolerance in a fully mismatched allogeneic splenocyte transfer model in mice. We now used this model to study whether regulatory T cells (Tregs) contribute to immune suppression and why both pathways have to be blocked simultaneously. Mice were injected with allogeneic splenocytes, CD4+ T cells, or CD8+ T cells and treated with MR1 mAb and different doses of CTLA-4Ig. The graft-versus-host reaction of CD4+ T cells, but not of CD8+ T cells, was inhibited by MR1. CTLA-4Ig was needed to cover CD8+ T cells but had only a weak effect on CD4+ T cells. Consequently, only the combination provided full protection when splenocytes were transferred. Importantly, MR1 and low-dose CTLA-4Ig treatment resulted in a relative increase in Tregs, and immune suppressive efficacy was abolished in the absence of Tregs. High-dose CTLA-4Ig treatment, in contrast, prevented Treg expansion and activity, and in combination with MR1 completely inhibited CD4+ and CD8+ T cell activation in a Treg-independent manner. In conclusion, MR1 and CTLA-4Ig act synergistically as they target different T cell populations. The contribution of Tregs to immune suppression by costimulation blockade depends on the concentration of CTLA-4Ig and thus on the degree of available CD28 costimulation. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.4049/jimmunol.1502039 |
| الاتاحة: | https://doi.org/10.4049/jimmunol.1502039 https://journals.aai.org/jimmunol/article-pdf/197/2/533/1420359/1502039.pdf |
| رقم الانضمام: | edsbas.EC4060D9 |
| قاعدة البيانات: | BASE |
| DOI: | 10.4049/jimmunol.1502039 |
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