International Immunology, Vol. 13, No. 4, 507-518,
April 2001
© 2001 Japanese Society for Immunology
Longitudinal analysis of T cells responding to tetanus toxoid in healthy subjects as well as in pediatric patients after bone marrow transplantation: the identification of identical TCRCDR3 regions in time suggests long-term stability of at least part of the antigen-specific TCR repertoire
Departments of Pediatrics and Immunohematology and Blood Transfusion, Leiden University Medical Center, Building 1, E3-Q, PO Box 9600, 2300 RC Leiden, The Netherlands
Correspondence to: P. J. van den Elsen
To understand the nature of long-term Th immune responses, we investigated in the present study the TCRBV gene repertoire of CD4+ T cells specific for the recall antigen tetanus toxoid (TT) in recipients of an allogeneic bone marrow transplantation (allo-BMT) at several time points after transplantation and in their BM donors. We observed that the TCR repertoire of TT-specific CD4+ Th cells was heterogeneous, and differed between allo-BMT recipients and their respective donors. Some individuals, however, used similar TCRcomplementarity-determining region (CDR) 3 motifs that could reflect recognition of and selection by similar promiscuous epitopes of TT. Longitudinal analysis of this TT-specific T cell response revealed that T cells with completely identical TCR were present at several time points after the first analysis in allo-BMT recipients, most probably reflecting long-term stability of at least part of the antigen-specific TCR repertoire. Similar stability of the TT-specific TCR repertoire in time was also noted in the allo-BMT donors. These observations reveal that within a given individual the dominant antigen-specific T cell clones persist in time in an otherwise diverse TT-specific CD4+ T cell immune response.
Keywords: clonal expansion, human, repertoire development, T lymphocytes, TCR