Related Experiment Videos
Structural identity between HLA-A2 antigens differentially recognized by alloreactive cytotoxic T lymphocytes
A R Castaño1, P Lauzurica, N Domenech
1Department of Immunology, Fundación Jiménez Díaz, Consejo Superior de Investigaciones Científicas, Madrid, Spain.
Journal of Immunology (Baltimore, Md. : 1950)
|May 1, 1991
Summary
Alloreactive T cells can recognize structurally identical HLA-A2 subtypes, suggesting peptide corecognition. This challenges the basis of HLA-A2 subtype differentiation and T cell recognition.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- Alloreactive cytotoxic T lymphocytes (CTL) show varied recognition of HLA-A2 subtypes.
- Previous work identified HLA-A2 subtypes based on CTL recognition, including A2-SCHU.
- Heterogeneity in CTL recognition was linked to structural differences in target antigens.
Purpose of the Study:
- To investigate the molecular basis of heterogeneous CTL recognition among HLA-A2 subtypes.
- To compare A2-SCHU with A*0206 and analyze differentially recognized HLA-A2.1 antigens.
- To determine if structural identity underlies differential CTL recognition.
Main Methods:
- Double-label comparative peptide mapping of differentially recognized HLA-A2.1 and HLA-A2.4 antigens.
- Sequencing of polymerase chain reaction-amplified full-length cDNA from A2-SCHU.
Main Results:
- A2-SCHU was indistinguishable from A*0206 by peptide mapping and cDNA sequencing.
- Differentially recognized HLA-A2.1 antigens were indistinguishable from A*0201 by peptide mapping.
- Structural identity was observed among HLA-A2 subtypes with distinct CTL recognition patterns.
Conclusions:
- Differential recognition by alloreactive CTL can occur between structurally identical class I HLA antigens.
- Allorecognition may involve corecognition of endogenous peptides derived from polymorphic proteins.
- The study suggests a revised understanding of HLA-A2 subtype differentiation and CTL recognition mechanisms.