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T cell receptor usage by HLA-DQw8-specific T cell clones
T Hansen1, K E Lundin, G Markussen
1Institute of Transplantation Immunology, National Hospital, Oslo, Norway.
International Immunology
|August 1, 1992
Summary
T cells recognizing the same HLA-DQw8 molecule show similarities in their T cell receptor (TCR) structures. This suggests a potential bias in TCR usage for HLA-DQw8 recognition.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- T cells play a crucial role in adaptive immunity by recognizing antigens presented by Human Leukocyte Antigen (HLA) molecules.
- The T cell receptor (TCR) is responsible for antigen recognition, and its diversity is generated through V(D)J recombination.
- Understanding TCR structure-function relationships is key to deciphering immune responses.
Purpose of the Study:
- To investigate potential structural homologies within T cell receptors (TCRs) of T lymphocyte clones (TLCs) that recognize the same HLA molecule, specifically HLA-DQw8.
- To determine if there is preferential usage of specific TCR gene segments or motifs in T cells targeting HLA-DQw8.
Main Methods:
- Sequencing of T cell receptor alpha (TCR alpha) and beta (TCR beta) genes from five different HLA-DQw8-specific T lymphocyte clones (TLCs).
- Analysis of the sequenced TCR genes to identify similarities in variable (V), joining (J), and diversity (D) gene segments, as well as complementarity-determining regions (CDRs).
Main Results:
- All five studied TLCs utilized distinct V alpha and V beta gene segments.
- However, four of the four alloreactive, HLA-DQw8-specific TLCs shared a common CDR1 beta motif.
- All five TLCs exclusively used either the J beta 2.3 or J beta 2.5 gene segments, and two TLCs shared the same J alpha gene segment.
Conclusions:
- The findings suggest a potential preferential usage of specific TCR structures, including CDR motifs and J beta segments, by T cells that are specific for the HLA-DQw8 molecule.
- This preferential usage may contribute to the repertoire of T cells capable of recognizing HLA-DQw8, indicating a degree of structural constraint in TCR selection for this HLA type.