Related Experiment Videos
T-cell clones identify three distinct epitopes associated with HLA-Dw14
E M Mickelson1, S Masewicz, A Smith
1Fred Hutchinson Cancer Research Center, Seattle, WA 98104.
Human Immunology
|November 1, 1991
Summary
This study reveals how T-cells recognize specific sequences on HLA-DR molecules, uncovering distinct recognition patterns for different HLA-DR alleles and highlighting the complexity of immune responses.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- Human Leukocyte Antigen (HLA) class II molecules are crucial for immune responses.
- Allorecognition, particularly of HLA-DR, is vital in transplantation immunology.
Purpose of the Study:
- To investigate the specific allodeterminants recognized by T-cell clones against HLA-DR1, -DR4, and -DRw14 alleles.
- To delineate the molecular basis of T-cell recognition of HLA-DR alloepitopes.
Main Methods:
- Generation and characterization of alloreactive T-cell clones.
- Testing T-cell recognition against a panel of HLA-D homozygous B-cell lines and peripheral blood lymphocytes.
- Blocking experiments using monoclonal antibodies specific for HLA-DR, -DQ, and -DP molecules.
Main Results:
- Three T-cell clones exhibited unique HLA-DR-specific allorecognition patterns.
- A specific sequence (L67-A74) in the DR beta 1 molecule was identified as a key recognition site.
- Differential recognition of the L67-A74 sequence based on specific HLA-DR alleles (DR4, Dw14) indicated the involvement of other molecular residues.
Conclusions:
- T-cell responses against alloepitopes on a single HLA class II allele can be highly specific.
- Diverse regions of the HLA class II molecule contribute to the formation of allorecognition sites.
- Understanding these specificities is crucial for predicting and managing immune responses in transplantation.