T cell receptor diversity in alloreactive responses against HLA-B27 (B*2705) is limited by multiple-level restrictions in both alpha and beta chains.
Eur J Immunol
; 25(9): 2479-85, 1995 Sep.
Article
em En
| MEDLINE
| ID: mdl-7589114
ABSTRACT
The T cell receptors (TCR) in HLA-B27 (B*2705) alloreactivity were analyzed in cytotoxic T lymphocytes (CTL) from two individuals. Non-random usage was found in V beta, N+D beta, V alpha, and J alpha, but not in J beta segments or N alpha-regions. V beta segments from homology subgroup 4 were predominant and not associated to a particular donor or fine specificity, suggesting involvement in recognizing the HLA-B27 molecule. In contrast, preferential V alpha usage was associated with particular individuals and fine specificities, indicating distinct V beta and V alpha recruitment and contribution to allorecognition. Recurrent N+D beta motifs and J alpha segments, even from different donors, limited junctional diversity, suggesting that CDR3 usage was determined by the alloantigenic epitope independently of individuals. TCR were selected differently at various levels, as indicated by the following findings. Four clonotypes with similar fine specificity had identical beta and unrelated alpha chains. Similar alpha were associated with unrelated beta chains, and vice versa. CTL using V beta subgroup 4 did not globally show concomitant predominance of other TCR elements. V alpha 7, one of the preferred V alpha segments, was always associated with V beta subgroups other than 4. Sometimes, a TCR showed homology in elements of one chain to a second TCR or group of TCR, and to another in the other chain. These results are best explained by differential selection of TCR elements by different epitopes, providing a key to the inner structure of allospecific TCR repertoires.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Linfócitos T Citotóxicos
/
Antígeno HLA-B27
/
Subpopulações de Linfócitos T
/
Receptores de Antígenos de Linfócitos T alfa-beta
Tipo de estudo:
Diagnostic_studies
Limite:
Humans
Idioma:
En
Revista:
Eur J Immunol
Ano de publicação:
1995
Tipo de documento:
Article
País de afiliação:
Espanha