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A T-cell clone recognizing an MLC stimulating epitope located on the DRw11 beta 1 chain
A Urlacher1, J M Tiercy, M Schlesier
1Laboratoire d'Histocompatibilité, Centre Régional de Transfusion Sanguine, Strasbourg, France.
Human Immunology
|December 1, 1989
Summary
This study identified specific amino acids on the DRw11 beta 1 chain recognized by a T-cell clone. These findings advance understanding of T-cell receptor interactions with major histocompatibility complex molecules.
Area of Science:
- Immunology
- Genetics
- Molecular Biology
Background:
- T-cell clones are crucial for immune responses.
- Major histocompatibility complex (MHC) class II molecules present antigens to T-cells.
- DRw11 is a specific human leukocyte antigen (HLA) type.
Purpose of the Study:
- To characterize the epitope recognized by an alloreactive T-cell clone (6065 WS).
- To identify specific amino acids on the DRw11 beta 1 chain involved in T-cell recognition.
Main Methods:
- Generation of an alloreactive T-cell clone (6065 WS) from a haploidentical mother and son.
- Proliferation assays using DRw11 families and homozygous B-cell lines.
- Blocking assays with monoclonal antibodies.
- Comparison of T-cell reactivity with known DRw11 beta 1 amino acid sequences.
Main Results:
- Clone 6065 WS specifically recognizes an epitope on the DRw11 beta 1 chain.
- Two unique amino acids at positions 71 and 86 of the DRw11 beta 1 chain were identified as critical for recognition.
- These amino acids may directly interact with the T-cell receptor or influence molecular conformation.
Conclusions:
- Specific amino acid residues on the DRw11 beta 1 chain dictate T-cell recognition.
- These findings contribute to understanding T-cell receptor-MHC interactions.
- The identified amino acids may play a role in self-peptide presentation by MHC class II molecules.