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CD8+ T cells respond clonally to Mls-1a-encoded determinants.
H R MacDonald1, R K Lees, Y Chvatchko
1Ludwig Institute for Cancer Research, Lausanne Branch, Epalinges, Switzerland.
The Journal of Experimental Medicine
|April 1, 1990
Summary
CD8+ T cells, like CD4+ T cells, respond to Mls-1a determinants using specific T cell receptor V beta domains. This response is influenced by MHC class II alleles, similar to bacterial superantigens.
Area of Science:
- Immunology
- T cell biology
- MHC restriction
Background:
- T cell responses to Mls-1a typically involve CD4+ T cells and specific T cell receptor (TCR) V beta domains.
- These responses were generally thought to be restricted to the CD4+ mature T cell subset.
Purpose of the Study:
- To investigate whether CD8+ T cells also respond to Mls-1a determinants.
- To determine the role of MHC haplotype in Mls-1a specific T cell responses.
Main Methods:
- Mixed leukocyte cultures (in vitro) to assess T cell proliferation.
- Adoptive transfer system (in vivo) to evaluate T cell responses.
- Flow cytometry to identify CD4+ and CD8+ T cell subsets expressing specific V beta domains.
Main Results:
- CD8+ T cells expressing V beta 6 or V beta 8.1 T cell receptors (TCRs) demonstrated preferential responses to Mls-1a determinants.
- Both CD4+ and CD8+ T cell responses to Mls-1a were dependent on the stimulator cells' MHC haplotype.
- MHC class II I-E+ alleles (H-2d, H-2k) were significantly more stimulatory than I-E- alleles (H-2q).
Conclusions:
- CD8+ T cells, similar to CD4+ T cells, can respond to Mls-1a determinants.
- The findings support the classification of Mls-1a gene products as superantigens, analogous to bacterial enterotoxins.
- MHC class II molecules play a crucial role in presenting Mls-1a determinants to T cells.