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Inhibition of human T cell proliferation by CTLA-4 utilizes CD80 and requires CD25+ regulatory T cells
Claire N Manzotti1, Helen Tipping, Laura C A Perry
1MRC Centre for Immune Regulation, University of Birmingham Medical School, Vincent Drive, Birmingham B15 2TT, GB, UK.
Abstract:
CD28 and CTLA-4 are opposing regulators of T cell activation, triggered by the two ligands CD80 and CD86. How these ligands promote either T cell activation via CD28 or inhibition via CTLA-4 is not understood. Using CD80 and CD86 molecules expressed on transfected cells, we have identified a major difference between these ligands in that CD80 transfectants have the ability to inhibit activation of resting human peripheral blood T cells via interaction with CTLA-4, whereas CD86 transfectants do not. Rather, CTLA-4-CD86 interactions appear to contribute towards T cell proliferation. We also observed that CTLA-4 function is strongly influenced by TCR stimulation, effects being observed only at relatively low levels of TCR stimulation. The kinetics of CD80-CTLA-4 interactions revealed that CTLA-4 inhibition took place within the first 8 h of T cell stimulation, despite there being little measurable CTLA-4 expression on the majority T cells. However, significant amounts of CTLA-4 were observed in the CD25(+) CD4(+) subset of T cells which, when removed from the cultures, accounted for the CTLA-4 inhibition observed. Overall, these data provide evidence that CD80 and CD86 differ in their interactions with CTLA-4 and that CD80 appears to be the preferential inhibitory ligand for CTLA-4 working via a population of CD4(+) CD25(+) CTLA-4(+) regulatory T cells.
Insights
CD80, but not CD86, inhibits T cell activation via CTLA-4. This inhibitory function is mediated by CD4(+) CD25(+) regulatory T cells, highlighting distinct ligand roles in immune responses.
Area of Science:
- Immunology
- Cellular Biology
- Molecular Biology
Background:
- CD28 and CTLA-4 are key regulators of T cell activation.
- CD80 and CD86 are ligands for both CD28 and CTLA-4.
- The differential roles of CD80 and CD86 in T cell regulation are not fully understood.
Purpose of the Study:
- To investigate the distinct functions of CD80 and CD86 in T cell regulation via CTLA-4.
- To elucidate the mechanisms by which CD80 and CD86 interact with CTLA-4.
- To identify the T cell subsets involved in CTLA-4-mediated regulation.
Main Methods:
- Expression of CD80 and CD86 on transfected cells.
- Assays for human peripheral blood T cell activation.
- Analysis of CTLA-4 expression and function.
- T cell subset isolation and functional assessment.
Main Results:
- CD80, but not CD86, inhibited T cell activation through CTLA-4.
- CD86-CTLA-4 interactions appeared to promote T cell proliferation.
- CTLA-4 function was dependent on T cell receptor stimulation levels.
- CD80-CTLA-4 inhibition was rapid and mediated by CD4(+) CD25(+) T cells expressing CTLA-4.
Conclusions:
- CD80 and CD86 exhibit distinct interaction profiles with CTLA-4.
- CD80 is the preferred inhibitory ligand for CTLA-4.
- CD80-mediated inhibition involves CD4(+) CD25(+) CTLA-4(+) regulatory T cells.
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