Nov, 2003
Thymus leukemia antigen (TL)-specific cytotoxic T lymphocytes recognize the alpha 1/alpha 2 domain of TL free from antigenic peptides
INTERNATIONAL IMMUNOLOGY
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- Volume
- 15
- Number
- 11
- First page
- 1319
- Last page
- 1326
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1093/intimm/dxg131
- Publisher
- OXFORD UNIV PRESS
The thymus leukemia antigens (TL) belong to the MHC class Ib family and can be recognized by CD8-dependent or -independent cytotoxic T lymphocytes (CTL) showing TL, but not H-2, restriction. We previously reported that the CTL epitope is TAP independent and in the present study we further characterize the recognition mechanism of CD8-dependent TL-specific TCRalphabeta CTL. We first prepared empty TL tetramers by way of peptide-independent folding with recombinant proteins produced in an Escherichia coli expression system, and showed that TL-specific CTL recognized TL without putative TL-associated peptide and/or post-translational modifications of TL by mammalian and insect cells. We next prepared transfectants; expressing various chimeric TL molecules with mouse or human MHC class I as well as chimeric TL tetramers with recombinant proteins produced by insect cells, and demonstrated that chimeric TL whose alpha3 domain was replaced by that of H-2K(b), but not of HLA-A2, was sufficient for binding and activation of TL-specific CTL. These results indicate that TL-specific CTL recognize predominantly their alpha1/alpha2 domain as an epitope(s) and that the binding activity to the murine CD8 of the alpha3 domain of H-2K(b) is sufficient to induce their CTL activity, although it is known to be weaker than that of TL, but stronger than that of HLA. The results taken together indicate that CD8-dependent TL-specific TCRalphabeta CTL recognize an epitope(s) of the alpha1/alpha2 domain of TL free from antigenic molecules, and that CD8 plays an important role in stable interactions between TL and their corresponding TCR.
- Link information
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- DOI
- https://doi.org/10.1093/intimm/dxg131
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000186325600006&DestApp=WOS_CPL
- URL
- http://www.scopus.com/inward/record.url?eid=2-s2.0-0242720681&partnerID=MN8TOARS
- URL
- http://orcid.org/0000-0003-0995-9405
- ID information
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- DOI : 10.1093/intimm/dxg131
- ISSN : 0953-8178
- ORCID - Put Code : 47323583
- SCOPUS ID : 0242720681
- Web of Science ID : WOS:000186325600006