Dissection and molecular analysis of alloreactive CD8+ T cell responses in allogeneic haematopoietic stem cell transplantation.
Cancer Immunol Immunother
; 57(6): 849-57, 2008 Jun.
Article
em En
| MEDLINE
| ID: mdl-18004563
ABSTRACT
We applied a cDNA expression screening procedure with cryopreserved non-clonal CD8+ T cell populations (Lennerz et al., Proc. Natl. Acad. Sci. USA 10216013-8, 2005) to the identification of candidate antigens for graft-versus-host disease (GvHD) and graft-versus-leukaemia (GvL) effects in allogeneic haematopoietic stem cell transplantation (allo-HSCT). In a patient-donor model system with HLA class I disparities, we identified an HLA-B*44 mismatch allele, HLA-B*4405, as the dominant target of alloreactive T cells expanded in vitro from donor peripheral blood mononuclear cells (PBMC). HLA-B*4405-reactive T cells were detectable after multiple in vitro stimulations in the patient's post-HSCT PBMC. In a patient-donor model with full HLA compatibility, the major target antigen of donor lymphocytes stimulated in vitro with the respective patient's pre-HSCT PBMC was restricted by HLA-A*0201 and was encoded by TRIM22-442 C, a newly detected polymorphic allele of the tripartite motif family member TRIM22 (synonym STAF50), preferentially expressed in cells of the haematopoietic system. An arginine(R)-to-cysteine(C) exchange at position 442 generated an immunogenic T cell epitope equivalent to a minor histocompatibility antigen (mHag). TRIM22-442C-specific T cells persisted long-term in the patient's post-HSCT PBMC. Approximately, 1.3% of Caucasians carry TRIM22.442 C in association with HLA-A*0201. In particular, the knowledge of a large and diverse panel of such mHags may be crucial for further improvement of donor selection and adoptive T cell transfer strategies. The procedure applied herein will help to accelerate and facilitate their identification.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Transplante Homólogo
/
Leucemia Mieloide Aguda
/
Transplante de Células-Tronco Hematopoéticas
/
Linfócitos T CD8-Positivos
Limite:
Adult
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Female
/
Humans
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article