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Published on: March 5, 2010
CD83 on murine APC does not function as a costimulatory receptor for T cells
Birte Kretschmer1, Katja Lüthje, Svenja Ehrlich
1Bernhard-Nocht-Institute for Tropical Medicine, Bernhard-Nocht-Strasse 74, D-20359 Hamburg, Germany.
Immunology Letters
|August 5, 2008
Summary
The transmembrane glycoprotein CD83 does not appear to provide crucial costimulatory signals for T cell activation in mice. Studies found CD83 expression levels on antigen-presenting cells (APCs) did not impact T cell activation capacity.
Area of Science:
- Immunology
- Cell Biology
Background:
- Transmembrane glycoprotein CD83 is upregulated on dendritic cells (DCs) during maturation.
- CD83's role in T cell activation has been debated, with some studies suggesting a costimulatory function.
Purpose of the Study:
- To investigate the role of CD83 in T cell activation by comparing CD83-overexpressing and CD83-deficient antigen-presenting cells (APCs).
- To resolve conflicting data regarding CD83's costimulatory function in T cell activation.
Main Methods:
- Comparison of T cell activation by CD83-overexpressing and CD83-deficient murine APCs.
- Assessment of CD8(+) and CD4(+) T cell activation in vitro and in vivo.
- Correlation analysis of CD83 expression with MHC-I and MHC-II expression.
Main Results:
- CD83 expression levels on APCs did not affect the activation of CD8(+) T cells.
- CD83 expression did not significantly impact CD4(+) T cell activation in vivo.
- A weak positive correlation between CD83 and CD4(+) T cell activation was observed in vitro under suboptimal conditions, potentially linked to MHC-II expression.
Conclusions:
- CD83 does not appear to deliver crucial costimulatory signals to murine T cells.
- The observed effects on CD4(+) T cell activation may be attributed to altered MHC-II peptide complex density rather than direct CD83 costimulation.
